(function(){/*
 Jeff Parsons 2012-2016

 This file is part of PCjs, a computer emulation software project at <http://pcjs.org/>.

 PCjs is free software: you can redistribute it and/or modify it under the terms of the
 GNU General Public License as published by the Free Software Foundation, either version 3
 of the License, or (at your option) any later version.

 PCjs is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
 even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License along with PCjs.  If not,
 see <http://www.gnu.org/licenses/gpl.html>.

 You are required to include the above copyright notice in every source code file of every
 copy or modified version of this work, and to display that copyright notice on every screen
 that loads or runs any version of this software (see COPYRIGHT in /modules/shared/lib/defines.js).

 Some PCjs files also attempt to load external resource files, such as character-image files,
 ROM files, and disk image files. Those external resource files are not considered part of PCjs
 for purposes of the GNU General Public License, and the author does not claim any copyright
 as to their contents.
 Jeff Parsons 2012-2016

 This file is part of PCjs, a computer emulation software project at <http://pcjs.org/>.

 PCjs is free software: you can redistribute it and/or modify it under the terms of the
 GNU General Public License as published by the Free Software Foundation, either version 3
 of the License, or (at your option) any later version.

 PCjs is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
 even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License along with PCjs.  If not,
 see <http://www.gnu.org/licenses/gpl.html>.

 You are required to include the above copyright notice in every source code file of every
 copy or modified version of this work, and to display that copyright notice on every screen
 that loads or runs any version of this software (see COPYRIGHT in /modules/shared/lib/defines.js).

 Some PCjs files also attempt to load external resource files, such as character-image files,
 ROM files, and disk image files. Those external resource files are not considered part of PCjs
 for purposes of the GNU General Public License, and the author does not claim any copyright
 as to their contents.
 Jeff Parsons 2012-2016

 This file is part of PCjs, a computer emulation software project at <http://pcjs.org/>.

 PCjs is free software: you can redistribute it and/or modify it under the terms of the
 GNU General Public License as published by the Free Software Foundation, either version 3
 of the License, or (at your option) any later version.

 PCjs is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
 even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License along with PCjs.  If not,
 see <http://www.gnu.org/licenses/gpl.html>.

 You are required to include the above copyright notice in every source code file of every
 copy or modified version of this work, and to display that copyright notice on every screen
 that loads or runs any version of this software (see COPYRIGHT in /modules/shared/lib/defines.js).

 Some PCjs files also attempt to load external resource files, such as character-image files,
 ROM files, and disk image files. Those external resource files are not considered part of PCjs
 for purposes of the GNU General Public License, and the author does not claim any copyright
 as to their contents.
 Jeff Parsons 2012-2016

 This file is part of PCjs, a computer emulation software project at <http://pcjs.org/>.

 PCjs is free software: you can redistribute it and/or modify it under the terms of the
 GNU General Public License as published by the Free Software Foundation, either version 3
 of the License, or (at your option) any later version.

 PCjs is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
 even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License along with PCjs.  If not,
 see <http://www.gnu.org/licenses/gpl.html>.

 You are required to include the above copyright notice in every source code file of every
 copy or modified version of this work, and to display that copyright notice on every screen
 that loads or runs any version of this software (see COPYRIGHT in /modules/shared/lib/defines.js).

 Some PCjs files also attempt to load external resource files, such as character-image files,
 ROM files, and disk image files. Those external resource files are not considered part of PCjs
 for purposes of the GNU General Public License, and the author does not claim any copyright
 as to their contents.
 Jeff Parsons 2012-2016

 This file is part of PCjs, a computer emulation software project at <http://pcjs.org/>.

 PCjs is free software: you can redistribute it and/or modify it under the terms of the
 GNU General Public License as published by the Free Software Foundation, either version 3
 of the License, or (at your option) any later version.

 PCjs is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
 even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License along with PCjs.  If not,
 see <http://www.gnu.org/licenses/gpl.html>.

 You are required to include the above copyright notice in every source code file of every
 copy or modified version of this work, and to display that copyright notice on every screen
 that loads or runs any version of this software (see COPYRIGHT in /modules/shared/lib/defines.js).

 Some PCjs files also attempt to load external resource files, such as character-image files,
 ROM files, and disk image files. Those external resource files are not considered part of PCjs
 for purposes of the GNU General Public License, and the author does not claim any copyright
 as to their contents.
 Jeff Parsons 2012-2016

 This file is part of PCjs, a computer emulation software project at <http://pcjs.org/>.

 PCjs is free software: you can redistribute it and/or modify it under the terms of the
 GNU General Public License as published by the Free Software Foundation, either version 3
 of the License, or (at your option) any later version.

 PCjs is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
 even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License along with PCjs.  If not,
 see <http://www.gnu.org/licenses/gpl.html>.

 You are required to include the above copyright notice in every source code file of every
 copy or modified version of this work, and to display that copyright notice on every screen
 that loads or runs any version of this software (see COPYRIGHT in /modules/shared/lib/defines.js).

 Some PCjs files also attempt to load external resource files, such as character-image files,
 ROM files, and disk image files. Those external resource files are not considered part of PCjs
 for purposes of the GNU General Public License, and the author does not claim any copyright
 as to their contents.
 Jeff Parsons 2012-2016

 This file is part of PCjs, a computer emulation software project at <http://pcjs.org/>.

 PCjs is free software: you can redistribute it and/or modify it under the terms of the
 GNU General Public License as published by the Free Software Foundation, either version 3
 of the License, or (at your option) any later version.

 PCjs is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
 even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License along with PCjs.  If not,
 see <http://www.gnu.org/licenses/gpl.html>.

 You are required to include the above copyright notice in every source code file of every
 copy or modified version of this work, and to display that copyright notice on every screen
 that loads or runs any version of this software (see COPYRIGHT in /modules/shared/lib/defines.js).

 Some PCjs files also attempt to load external resource files, such as character-image files,
 ROM files, and disk image files. Those external resource files are not considered part of PCjs
 for purposes of the GNU General Public License, and the author does not claim any copyright
 as to their contents.
 Jeff Parsons 2012-2016

 This file is part of PCjs, a computer emulation software project at <http://pcjs.org/>.

 It has been adapted from the JavaScript PDP 11/70 Emulator v1.3 written by Paul Nankervis
 (paulnank@hotmail.com) as of August 2016 from http://skn.noip.me/pdp11/pdp11.html.  This code
 may be used freely provided the original author name is acknowledged in any modified source code.

 PCjs is free software: you can redistribute it and/or modify it under the terms of the
 GNU General Public License as published by the Free Software Foundation, either version 3
 of the License, or (at your option) any later version.

 PCjs is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
 even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License along with PCjs.  If not,
 see <http://www.gnu.org/licenses/gpl.html>.

 You are required to include the above copyright notice in every source code file of every
 copy or modified version of this work, and to display that copyright notice on every screen
 that loads or runs any version of this software (see COPYRIGHT in /modules/shared/lib/defines.js).

 Some PCjs files also attempt to load external resource files, such as character-image files,
 ROM files, and disk image files. Those external resource files are not considered part of PCjs
 for purposes of the GNU General Public License, and the author does not claim any copyright
 as to their contents.
 Jeff Parsons 2012-2016

 This file is part of PCjs, a computer emulation software project at <http://pcjs.org/>.

 PCjs is free software: you can redistribute it and/or modify it under the terms of the
 GNU General Public License as published by the Free Software Foundation, either version 3
 of the License, or (at your option) any later version.

 PCjs is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
 even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License along with PCjs.  If not,
 see <http://www.gnu.org/licenses/gpl.html>.

 You are required to include the above copyright notice in every source code file of every
 copy or modified version of this work, and to display that copyright notice on every screen
 that loads or runs any version of this software (see COPYRIGHT in /modules/shared/lib/defines.js).

 Some PCjs files also attempt to load external resource files, such as character-image files,
 ROM files, and disk image files. Those external resource files are not considered part of PCjs
 for purposes of the GNU General Public License, and the author does not claim any copyright
 as to their contents.
 Jeff Parsons 2012-2016

 This file is part of PCjs, a computer emulation software project at <http://pcjs.org/>.

 It has been adapted from the JavaScript PDP 11/70 Emulator v1.3 written by Paul Nankervis
 (paulnank@hotmail.com) as of August 2016 from http://skn.noip.me/pdp11/pdp11.html.  This code
 may be used freely provided the original author name is acknowledged in any modified source code.

 PCjs is free software: you can redistribute it and/or modify it under the terms of the
 GNU General Public License as published by the Free Software Foundation, either version 3
 of the License, or (at your option) any later version.

 PCjs is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
 even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License along with PCjs.  If not,
 see <http://www.gnu.org/licenses/gpl.html>.

 You are required to include the above copyright notice in every source code file of every
 copy or modified version of this work, and to display that copyright notice on every screen
 that loads or runs any version of this software (see COPYRIGHT in /modules/shared/lib/defines.js).

 Some PCjs files also attempt to load external resource files, such as character-image files,
 ROM files, and disk image files. Those external resource files are not considered part of PCjs
 for purposes of the GNU General Public License, and the author does not claim any copyright
 as to their contents.
 Jeff Parsons 2012-2016

 This file is part of PCjs, a computer emulation software project at <http://pcjs.org/>.

 PCjs is free software: you can redistribute it and/or modify it under the terms of the
 GNU General Public License as published by the Free Software Foundation, either version 3
 of the License, or (at your option) any later version.

 PCjs is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
 even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License along with PCjs.  If not,
 see <http://www.gnu.org/licenses/gpl.html>.

 You are required to include the above copyright notice in every source code file of every
 copy or modified version of this work, and to display that copyright notice on every screen
 that loads or runs any version of this software (see COPYRIGHT in /modules/shared/lib/defines.js).

 Some PCjs files also attempt to load external resource files, such as character-image files,
 ROM files, and disk image files. Those external resource files are not considered part of PCjs
 for purposes of the GNU General Public License, and the author does not claim any copyright
 as to their contents.
 Jeff Parsons 2012-2016

 This file is part of PCjs, a computer emulation software project at <http://pcjs.org/>.

 PCjs is free software: you can redistribute it and/or modify it under the terms of the
 GNU General Public License as published by the Free Software Foundation, either version 3
 of the License, or (at your option) any later version.

 PCjs is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
 even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License along with PCjs.  If not,
 see <http://www.gnu.org/licenses/gpl.html>.

 You are required to include the above copyright notice in every source code file of every
 copy or modified version of this work, and to display that copyright notice on every screen
 that loads or runs any version of this software (see COPYRIGHT in /modules/shared/lib/defines.js).

 Some PCjs files also attempt to load external resource files, such as character-image files,
 ROM files, and disk image files. Those external resource files are not considered part of PCjs
 for purposes of the GNU General Public License, and the author does not claim any copyright
 as to their contents.
 Jeff Parsons 2012-2016

 This file is part of PCjs, a computer emulation software project at <http://pcjs.org/>.

 PCjs is free software: you can redistribute it and/or modify it under the terms of the
 GNU General Public License as published by the Free Software Foundation, either version 3
 of the License, or (at your option) any later version.

 PCjs is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
 even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License along with PCjs.  If not,
 see <http://www.gnu.org/licenses/gpl.html>.

 You are required to include the above copyright notice in every source code file of every
 copy or modified version of this work, and to display that copyright notice on every screen
 that loads or runs any version of this software (see COPYRIGHT in /modules/shared/lib/defines.js).

 Some PCjs files also attempt to load external resource files, such as character-image files,
 ROM files, and disk image files. Those external resource files are not considered part of PCjs
 for purposes of the GNU General Public License, and the author does not claim any copyright
 as to their contents.
 Jeff Parsons 2012-2016

 This file is part of PCjs, a computer emulation software project at <http://pcjs.org/>.

 It has been adapted from the JavaScript PDP 11/70 Emulator v1.3 written by Paul Nankervis
 (paulnank@hotmail.com) as of August 2016 from http://skn.noip.me/pdp11/pdp11.html.  This code
 may be used freely provided the original author name is acknowledged in any modified source code.

 PCjs is free software: you can redistribute it and/or modify it under the terms of the
 GNU General Public License as published by the Free Software Foundation, either version 3
 of the License, or (at your option) any later version.

 PCjs is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
 even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License along with PCjs.  If not,
 see <http://www.gnu.org/licenses/gpl.html>.

 You are required to include the above copyright notice in every source code file of every
 copy or modified version of this work, and to display that copyright notice on every screen
 that loads or runs any version of this software (see COPYRIGHT in /modules/shared/lib/defines.js).

 Some PCjs files also attempt to load external resource files, such as character-image files,
 ROM files, and disk image files. Those external resource files are not considered part of PCjs
 for purposes of the GNU General Public License, and the author does not claim any copyright
 as to their contents.
 Jeff Parsons 2012-2016

 This file is part of PCjs, a computer emulation software project at <http://pcjs.org/>.

 It has been adapted from the JavaScript PDP 11/70 Emulator v1.3 written by Paul Nankervis
 (paulnank@hotmail.com) as of August 2016 from http://skn.noip.me/pdp11/pdp11.html.  This code
 may be used freely provided the original author name is acknowledged in any modified source code.

 PCjs is free software: you can redistribute it and/or modify it under the terms of the
 GNU General Public License as published by the Free Software Foundation, either version 3
 of the License, or (at your option) any later version.

 PCjs is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
 even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License along with PCjs.  If not,
 see <http://www.gnu.org/licenses/gpl.html>.

 You are required to include the above copyright notice in every source code file of every
 copy or modified version of this work, and to display that copyright notice on every screen
 that loads or runs any version of this software (see COPYRIGHT in /modules/shared/lib/defines.js).

 Some PCjs files also attempt to load external resource files, such as character-image files,
 ROM files, and disk image files. Those external resource files are not considered part of PCjs
 for purposes of the GNU General Public License, and the author does not claim any copyright
 as to their contents.
 Jeff Parsons 2012-2016

 This file is part of PCjs, a computer emulation software project at <http://pcjs.org/>.

 It has been adapted from the JavaScript PDP 11/70 Emulator v1.3 written by Paul Nankervis
 (paulnank@hotmail.com) as of August 2016 from http://skn.noip.me/pdp11/pdp11.html.  This code
 may be used freely provided the original author name is acknowledged in any modified source code.

 PCjs is free software: you can redistribute it and/or modify it under the terms of the
 GNU General Public License as published by the Free Software Foundation, either version 3
 of the License, or (at your option) any later version.

 PCjs is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
 even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License along with PCjs.  If not,
 see <http://www.gnu.org/licenses/gpl.html>.

 You are required to include the above copyright notice in every source code file of every
 copy or modified version of this work, and to display that copyright notice on every screen
 that loads or runs any version of this software (see COPYRIGHT in /modules/shared/lib/defines.js).

 Some PCjs files also attempt to load external resource files, such as character-image files,
 ROM files, and disk image files. Those external resource files are not considered part of PCjs
 for purposes of the GNU General Public License, and the author does not claim any copyright
 as to their contents.
 Jeff Parsons 2012-2016

 This file is part of PCjs, a computer emulation software project at <http://pcjs.org/>.

 It has been adapted from the JavaScript PDP 11/70 Emulator v1.3 written by Paul Nankervis
 (paulnank@hotmail.com) as of August 2016 from http://skn.noip.me/pdp11/pdp11.html.  This code
 may be used freely provided the original author name is acknowledged in any modified source code.

 PCjs is free software: you can redistribute it and/or modify it under the terms of the
 GNU General Public License as published by the Free Software Foundation, either version 3
 of the License, or (at your option) any later version.

 PCjs is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
 even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License along with PCjs.  If not,
 see <http://www.gnu.org/licenses/gpl.html>.

 You are required to include the above copyright notice in every source code file of every
 copy or modified version of this work, and to display that copyright notice on every screen
 that loads or runs any version of this software (see COPYRIGHT in /modules/shared/lib/defines.js).

 Some PCjs files also attempt to load external resource files, such as character-image files,
 ROM files, and disk image files. Those external resource files are not considered part of PCjs
 for purposes of the GNU General Public License, and the author does not claim any copyright
 as to their contents.
 Jeff Parsons 2012-2016

 This file is part of PCjs, a computer emulation software project at <http://pcjs.org/>.

 It has been adapted from the JavaScript PDP 11/70 Emulator v1.3 written by Paul Nankervis
 (paulnank@hotmail.com) as of August 2016 from http://skn.noip.me/pdp11/pdp11.html.  This code
 may be used freely provided the original author name is acknowledged in any modified source code.

 PCjs is free software: you can redistribute it and/or modify it under the terms of the
 GNU General Public License as published by the Free Software Foundation, either version 3
 of the License, or (at your option) any later version.

 PCjs is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
 even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License along with PCjs.  If not,
 see <http://www.gnu.org/licenses/gpl.html>.

 You are required to include the above copyright notice in every source code file of every
 copy or modified version of this work, and to display that copyright notice on every screen
 that loads or runs any version of this software (see COPYRIGHT in /modules/shared/lib/defines.js).

 Some PCjs files also attempt to load external resource files, such as character-image files,
 ROM files, and disk image files. Those external resource files are not considered part of PCjs
 for purposes of the GNU General Public License, and the author does not claim any copyright
 as to their contents.
 Jeff Parsons 2012-2016

 This file is part of PCjs, a computer emulation software project at <http://pcjs.org/>.

 It has been adapted from the JavaScript PDP 11/70 Emulator v1.3 written by Paul Nankervis
 (paulnank@hotmail.com) as of August 2016 from http://skn.noip.me/pdp11/pdp11.html.  This code
 may be used freely provided the original author name is acknowledged in any modified source code.

 PCjs is free software: you can redistribute it and/or modify it under the terms of the
 GNU General Public License as published by the Free Software Foundation, either version 3
 of the License, or (at your option) any later version.

 PCjs is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
 even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License along with PCjs.  If not,
 see <http://www.gnu.org/licenses/gpl.html>.

 You are required to include the above copyright notice in every source code file of every
 copy or modified version of this work, and to display that copyright notice on every screen
 that loads or runs any version of this software (see COPYRIGHT in /modules/shared/lib/defines.js).

 Some PCjs files also attempt to load external resource files, such as character-image files,
 ROM files, and disk image files. Those external resource files are not considered part of PCjs
 for purposes of the GNU General Public License, and the author does not claim any copyright
 as to their contents.
 Jeff Parsons 2012-2016

 This file is part of PCjs, a computer emulation software project at <http://pcjs.org/>.

 It has been adapted from the JavaScript PDP 11/70 Emulator v1.3 written by Paul Nankervis
 (paulnank@hotmail.com) as of August 2016 from http://skn.noip.me/pdp11/pdp11.html.  This code
 may be used freely provided the original author name is acknowledged in any modified source code.

 PCjs is free software: you can redistribute it and/or modify it under the terms of the
 GNU General Public License as published by the Free Software Foundation, either version 3
 of the License, or (at your option) any later version.

 PCjs is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
 even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License along with PCjs.  If not,
 see <http://www.gnu.org/licenses/gpl.html>.

 You are required to include the above copyright notice in every source code file of every
 copy or modified version of this work, and to display that copyright notice on every screen
 that loads or runs any version of this software (see COPYRIGHT in /modules/shared/lib/defines.js).

 Some PCjs files also attempt to load external resource files, such as character-image files,
 ROM files, and disk image files. Those external resource files are not considered part of PCjs
 for purposes of the GNU General Public License, and the author does not claim any copyright
 as to their contents.
 Jeff Parsons 2012-2016

 This file is part of PCjs, a computer emulation software project at <http://pcjs.org/>.

 It has been adapted from the JavaScript PDP 11/70 Emulator v1.3 written by Paul Nankervis
 (paulnank@hotmail.com) as of August 2016 from http://skn.noip.me/pdp11/pdp11.html.  This code
 may be used freely provided the original author name is acknowledged in any modified source code.

 PCjs is free software: you can redistribute it and/or modify it under the terms of the
 GNU General Public License as published by the Free Software Foundation, either version 3
 of the License, or (at your option) any later version.

 PCjs is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
 even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License along with PCjs.  If not,
 see <http://www.gnu.org/licenses/gpl.html>.

 You are required to include the above copyright notice in every source code file of every
 copy or modified version of this work, and to display that copyright notice on every screen
 that loads or runs any version of this software (see COPYRIGHT in /modules/shared/lib/defines.js).

 Some PCjs files also attempt to load external resource files, such as character-image files,
 ROM files, and disk image files. Those external resource files are not considered part of PCjs
 for purposes of the GNU General Public License, and the author does not claim any copyright
 as to their contents.
 Jeff Parsons 2012-2016

 This file is part of PCjs, a computer emulation software project at <http://pcjs.org/>.

 It has been adapted from the JavaScript PDP 11/70 Emulator v1.3 written by Paul Nankervis
 (paulnank@hotmail.com) as of August 2016 from http://skn.noip.me/pdp11/pdp11.html.  This code
 may be used freely provided the original author name is acknowledged in any modified source code.

 PCjs is free software: you can redistribute it and/or modify it under the terms of the
 GNU General Public License as published by the Free Software Foundation, either version 3
 of the License, or (at your option) any later version.

 PCjs is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
 even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License along with PCjs.  If not,
 see <http://www.gnu.org/licenses/gpl.html>.

 You are required to include the above copyright notice in every source code file of every
 copy or modified version of this work, and to display that copyright notice on every screen
 that loads or runs any version of this software (see COPYRIGHT in /modules/shared/lib/defines.js).

 Some PCjs files also attempt to load external resource files, such as character-image files,
 ROM files, and disk image files. Those external resource files are not considered part of PCjs
 for purposes of the GNU General Public License, and the author does not claim any copyright
 as to their contents.
 Jeff Parsons 2012-2016

 This file is part of PCjs, a computer emulation software project at <http://pcjs.org/>.

 It has been adapted from the JavaScript PDP 11/70 Emulator v1.3 written by Paul Nankervis
 (paulnank@hotmail.com) as of August 2016 from http://skn.noip.me/pdp11/pdp11.html.  This code
 may be used freely provided the original author name is acknowledged in any modified source code.

 PCjs is free software: you can redistribute it and/or modify it under the terms of the
 GNU General Public License as published by the Free Software Foundation, either version 3
 of the License, or (at your option) any later version.

 PCjs is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
 even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License along with PCjs.  If not,
 see <http://www.gnu.org/licenses/gpl.html>.

 You are required to include the above copyright notice in every source code file of every
 copy or modified version of this work, and to display that copyright notice on every screen
 that loads or runs any version of this software (see COPYRIGHT in /modules/shared/lib/defines.js).

 Some PCjs files also attempt to load external resource files, such as character-image files,
 ROM files, and disk image files. Those external resource files are not considered part of PCjs
 for purposes of the GNU General Public License, and the author does not claim any copyright
 as to their contents.
 Jeff Parsons 2012-2016

 This file is part of PCjs, a computer emulation software project at <http://pcjs.org/>.

 It has been adapted from the JavaScript PDP 11/70 Emulator v1.3 written by Paul Nankervis
 (paulnank@hotmail.com) as of August 2016 from http://skn.noip.me/pdp11/pdp11.html.  This code
 may be used freely provided the original author name is acknowledged in any modified source code.

 PCjs is free software: you can redistribute it and/or modify it under the terms of the
 GNU General Public License as published by the Free Software Foundation, either version 3
 of the License, or (at your option) any later version.

 PCjs is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
 even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License along with PCjs.  If not,
 see <http://www.gnu.org/licenses/gpl.html>.

 You are required to include the above copyright notice in every source code file of every
 copy or modified version of this work, and to display that copyright notice on every screen
 that loads or runs any version of this software (see COPYRIGHT in /modules/shared/lib/defines.js).

 Some PCjs files also attempt to load external resource files, such as character-image files,
 ROM files, and disk image files. Those external resource files are not considered part of PCjs
 for purposes of the GNU General Public License, and the author does not claim any copyright
 as to their contents.
 Jeff Parsons 2012-2016

 This file is part of PCjs, a computer emulation software project at <http://pcjs.org/>.

 It has been adapted from the JavaScript PDP 11/70 Emulator v1.3 written by Paul Nankervis
 (paulnank@hotmail.com) as of August 2016 from http://skn.noip.me/pdp11/pdp11.html.  This code
 may be used freely provided the original author name is acknowledged in any modified source code.

 PCjs is free software: you can redistribute it and/or modify it under the terms of the
 GNU General Public License as published by the Free Software Foundation, either version 3
 of the License, or (at your option) any later version.

 PCjs is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
 even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License along with PCjs.  If not,
 see <http://www.gnu.org/licenses/gpl.html>.

 You are required to include the above copyright notice in every source code file of every
 copy or modified version of this work, and to display that copyright notice on every screen
 that loads or runs any version of this software (see COPYRIGHT in /modules/shared/lib/defines.js).

 Some PCjs files also attempt to load external resource files, such as character-image files,
 ROM files, and disk image files. Those external resource files are not considered part of PCjs
 for purposes of the GNU General Public License, and the author does not claim any copyright
 as to their contents.
 Jeff Parsons 2012-2016

 This file is part of PCjs, a computer emulation software project at <http://pcjs.org/>.

 It has been adapted from the JavaScript PDP 11/70 Emulator v1.3 written by Paul Nankervis
 (paulnank@hotmail.com) as of August 2016 from http://skn.noip.me/pdp11/pdp11.html.  This code
 may be used freely provided the original author name is acknowledged in any modified source code.

 PCjs is free software: you can redistribute it and/or modify it under the terms of the
 GNU General Public License as published by the Free Software Foundation, either version 3
 of the License, or (at your option) any later version.

 PCjs is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
 even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License along with PCjs.  If not,
 see <http://www.gnu.org/licenses/gpl.html>.

 You are required to include the above copyright notice in every source code file of every
 copy or modified version of this work, and to display that copyright notice on every screen
 that loads or runs any version of this software (see COPYRIGHT in /modules/shared/lib/defines.js).

 Some PCjs files also attempt to load external resource files, such as character-image files,
 ROM files, and disk image files. Those external resource files are not considered part of PCjs
 for purposes of the GNU General Public License, and the author does not claim any copyright
 as to their contents.
 Jeff Parsons 2012-2016

 This file is part of PCjs, a computer emulation software project at <http://pcjs.org/>.

 PCjs is free software: you can redistribute it and/or modify it under the terms of the
 GNU General Public License as published by the Free Software Foundation, either version 3
 of the License, or (at your option) any later version.

 PCjs is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
 even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License along with PCjs.  If not,
 see <http://www.gnu.org/licenses/gpl.html>.

 You are required to include the above copyright notice in every source code file of every
 copy or modified version of this work, and to display that copyright notice on every screen
 that loads or runs any version of this software (see COPYRIGHT in /modules/shared/lib/defines.js).

 Some PCjs files also attempt to load external resource files, such as character-image files,
 ROM files, and disk image files. Those external resource files are not considered part of PCjs
 for purposes of the GNU General Public License, and the author does not claim any copyright
 as to their contents.
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function Cd(a,b,c){var d=a.b;if(0<c&&(a.la&&!--a.la||sc(a,b,1,a.f)))return!0;0<=c&&a.da.length&&(a.U++,a.g++,b=Mb(a.B,b),a.g--,null!=b&&(b=a.L[a.ga],b.w=d.u[7],b.Aa=!1,++a.ga==a.L.length&&(a.ga=0)));return!1}function sf(a){var b,c;a.f=["bp"];if(a.N)for(b=1;b<a.N.length;b++){c=a.N[b];var d=a.B;tc(d.P[Y(c)>>>d.Y],!1)}a.N=["br"];if(a.G)for(b=1;b<a.G.length;b++)c=a.G[b],d=a.B,tc(d.P[Y(c)>>>d.Y],!0);a.G=["bw"];a.Ya=0}
h.Sa=function(a,b,c){var d=!0;c||Jf(this,a,b,!1,!0);if(a!=this.f){var e=Y(b);if(-1===e)this.i("invalid address: "+I(this,b.w)),d=!1;else{var f=this.B;f.P[e>>>f.Y].Sa(e&f.f,a==this.G)}}d&&(a.push(b),c?b.Aa=!0:(Kf(this,a,a.length-1,"set"),tf(this)));return d};function Jf(a,b,c,d,e){var f=!1;c=Y(c);for(var g=1;g<b.length;g++){var l=b[g];if(c==Y(l)&&(!d||l.Aa)){f=!0;l.Aa||e||Kf(a,b,g,"cleared");b.splice(g,1);b!=a.f&&(d=a.B,tc(d.P[c>>>d.Y],b==a.G));l.Aa||tf(a);break}}return f}
function Lf(a,b){for(var c=1;c<b.length;c++)Kf(a,b,c);return b.length-1}function Kf(a,b,c,d){c=b[c];a.i(b[0]+" "+I(a,c.w)+(d?" "+d:c.gc?' "'+c.gc+'"':""))}function If(a,b){if(void 0!==b)sc(a,b,1,a.f,!0),a.aa=0;else for(b=1;b<a.f.length;b++){var c=a.f[b];if(c.Aa){if(!Jf(a,a.f,c,!0))break;b=0}}}
function sc(a,b,c,d,e){var f=!1;if(!a.Ya++)for(var g=1;!f&&g<d.length;g++){var l=d[g];if(!e||l.Aa)for(var n=Y(l),p=0;p<c;p++)if(b+p==n){var q,f=!0;l.Aa&&(Jf(a,d,l,!0),e=!0);if(q=l.oc){for(var f=!1,v=0;v<q.length;v++)if(!Mf(a,q[v],!0)){if(q[v].indexOf("if")){f=!0;break}for(var u=v+1;u<q.length&&q[u].indexOf("else");u++)v++;if(u==q.length){f=!0;break}}a.b.v.ba||(f=!0)}if(f){e||Kf(a,d,g,"hit");break}}}a.Ya--;return f}
function Nf(a,b,c,d){var e=X(b.w),f=a.ma(b,2),g,l;for(l in a.ab)if(g=a.ab[l][f&l])break;g||(g=[0]);for(var n=l="",p=wf[g[0]],q=g.length-1,v=1;v<=q;v++){var u=g[v];if(void 0!==u){var w;w=a;var B=u,u=b,x="",C=B&61440;if(4096==C)u=u.w+((f&255)<<24>>23)&65535,x=I(w,u);else if(8192==C)u=u.w-((f&63)<<1)&65535,x=I(w,u);else if(12288==C)x=I(w,f&7,1);else if(24576==C)x=I(w,f&63,1);else if(C=f&B,B&4032&&(C>>=6,B>>=6),B&63)switch(B=C&7,C&56){case 0:x=Ef(B);break;case 8:x="@"+Ef(B);break;case 16:7>B?x="("+Ef(B)+
")+":(C=w.ma(u,2),x="#"+I(w,C,0,!0));break;case 24:7>B?x="@("+Ef(B)+")+":(C=w.ma(u,2),x="@#"+I(w,C,0,!0));break;case 32:x="-("+Ef(B)+")";break;case 40:x="@-("+Ef(B)+")";break;case 48:C=w.ma(u,2);x=I(w,C,0,!0)+"("+Ef(B)+")";7==B&&(x=[x,I(w,C+u.w&65535)]);break;case 56:C=w.ma(u,2),x="@"+I(w,C)+"("+Ef(B)+")",7==B&&(x=[x,I(w,C+u.w&65535)])}w=x;if(!w||!w.length){l="INVALID";break}"string"!=typeof w&&(n=w[1],w=w[0]);0<l.length&&(l+=",");l+=w||"???"}}f="";g=I(a,e.w)+":";if(-1!==e.w&&-1!==b.w){do if(f+=" "+
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function Pf(a,b){var c="",d=a.b;8>b?(c=Ef(b),c+="="+I(a,d.u[b])):13>b?c="A"+(b-8)+"="+I(a,d.Ha[b-8]):16<=b&&20>b?c="S"+(b-16)+"="+I(a,d.ta[b-16]):20==b&&(c="PS="+I(a,Vb(d)));c&&(c+=" ");return c}function Qf(a){var b,c="";for(b=0;6>b;b++)c+=Pf(a,b);c=c+"\n"+(Pf(a,6)+Pf(a,7)+Pf(a,20));return c+=Of(a,"T")+Of(a,"N")+Of(a,"Z")+Of(a,"V")+Of(a,"C")}h.Kb=function(a,b){return a[0]>b[0]?1:a[0]<b[0]?-1:0};
function Rf(a,b,c){var d=[],e=Y(b)>>>0;for(b=0;b<a.H.length;b++){var f=a.H[b],g=f.w>>>0,l=f.wc;if(e>=g&&e<g+l){e=qa(f.Jb,[e-g],a.Kb);0<=e?Sf(a,b,e,d):c&&(e=~e,Sf(a,b,e-1,d),Sf(a,b,e,d));break}}return d}function Sf(a,b,c,d){var e={},f=a.H[b].Jb,g=0,l=null;0<=c&&c<f.length&&(g=f[c][0],l=f[c][1]);l&&(e=a.H[b].Da[l],l="."==l.charAt(0)?null:e.l||l);d.push(l);d.push(g);d.push(e.a);d.push(e.c)}
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function Uf(a,b,c){var d=null;if(b=zf(a,b,!0)){var e=Rf(a,b,!0);if(e.length){var f,g;e[0]&&(g="",(f=b.w-e[1])&&(g=" + "+k(f,4,!0)),f=e[0]+" ("+I(a,e[1])+")"+g,c&&a.i(f),d=f);4<e.length&&e[4]&&(g="",(f=e[5]-b.w)&&(g=" - "+k(f,4,!0)),f=e[4]+" ("+I(a,e[5])+")"+g,c&&a.i(f),d||(d=f))}else c&&a.i("no symbols")}return d}
function Gf(a,b){var c;if(b&&"?"==b[1])a.i("register commands:"),a.i("\tr\tdump registers"),a.i("\trx [#]\tset flag or register x to [#]");else{var d=a.b;null==c&&(c=!0);if(b&&1<b.length){var e=b[1],f=e.indexOf("=");if(0<f)b=e.substr(f+1),e=e.substr(0,f);else if(2<b.length)b=b[2];else{a.i("missing value for "+b[1]);return}f=mf(a,b);if(void 0===f)return;b=e.toUpperCase();switch(b){case "SP":case "R6":d.u[6]=f&65535;break;case "PC":case "R7":id(d,f);a.M=X(d.u[7]);break;case "N":d.V=f?32768:0;break;
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function Mf(a,b,c){var d=!0;try{b.length&&"end"!=b?c||a.i(">> "+b):(a.X&&(a.i("ended assemble at "+I(a,a.W.w)),a.M=a.W,a.X=!1),b="");var e=b.charAt(0);if('"'==e||"'"==e)return!0;a.oa=null;if(hb(a)&&0<b.length){a.X&&(b="a "+I(a,a.W.w)+" "+b);var f=!1,g=b.replace(/ +/g," ").split(" ");if(g&&g.length)for(var l=g[0],n=l.charAt(0),p=1;p<l.length;p++){var q=l.charAt(p);if("?"==n||"r"==n||"a">q||"z"<q){g[0]=l.substr(p);g.unshift(l.substr(0,p));break}}g[0]=g[0].toLowerCase();switch(g[0].charAt(0)){case "a":var v=
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a.i("\tbn [n]\tbreak after [n] instruction(s)");else{var ya=B.charAt(1);if("l"==ya){var Mc;Mc=0+Lf(a,a.f);Mc+=Lf(a,a.N);(Mc+=Lf(a,a.G))||a.i("no breakpoints")}else if("n"==ya)a.la=of(a,x),a.i("break after "+a.la+" instruction(s)");else if(void 0===x)a.i("missing breakpoint address");else{var U=X();if("*"!=x&&(U=zf(a,x,!0),!U))break a;"c"==ya?null==U.w?(sf(a),a.i("all breakpoints cleared")):Jf(a,a.f,U)||Jf(a,a.N,U)||Jf(a,a.G,U)||a.i("breakpoint missing: "+I(a,U.w)):null!=U.w&&(Df(a,U,C),"p"==ya?a.Sa(a.f,
U):"r"==ya?a.Sa(a.N,U):"w"==ya?a.Sa(a.G,U):a.i("unknown breakpoint command: "+ya))}}}break;case "c":a.Ta&&(a.Ta.value="");break;case "d":a:{var Na,Oa=g[0],ia=g[1],za=g[2],og=g[3];if("?"==ia){var Pa="";for(Na in xb)a.Ia[Na]&&(Pa&&(Pa+=","),Pa+=Na);Pa+=",state,symbols";a.i("dump memory commands:");a.i("\tdb [a] [#]    dump # bytes at address a");a.i("\tdw [a] [#]    dump # words at address a");a.i("\tdd [a] [#]    dump # dwords at address a");a.i("\tdh [#] [#]    dump # instructions from history");
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Oa;if("dh"==Oa){var xe=ia,ye=za,ze="",Ae=0,ca=a.ga,ja=a.L;if(ja.length){var Z=+xe||a.Za,jb=+ye||10;isNaN(Z)?Z=jb:ze="more ";Z>ja.length&&(a.i("note: only "+ja.length+" available"),Z=ja.length);ca-=Z;0>ca&&(null==ja[ja.length-1].w?(Z=ca+Z,ca=0):ca+=ja.length);var Pc=[];"call"==ye&&(jb=1E5,Pc=["CALL"]);for(void 0!==xe&&a.i(Z+" instructions earlier:");0<jb&&ca!=a.ga;){var Be=ja[ca++];if(null==Be.w)break;var kb=X(Be.w),pg=Z--,Ce=Nf(a,kb,"history",pg);(!Pc.length||0<=Ce.indexOf(Pc[0]))&&a.i(Ce);kb.zb&&
(ca+=kb.zb,jb-=kb.zb,Z-=kb.zb);ca>=ja.length&&(ca=0);a.Za=Z;Ae++;jb--}}Ae||(a.i("no "+ze+"history available"),a.Za=void 0)}else{var Yb=zf(a,ia);if(Yb){var Zb=0;za&&("l"==za.charAt(0)&&(za=za.substr(1)||og),Zb=of(a,za)>>>0,65536<Zb&&(Zb=65536));for(var lb="",mb="dd"==Oa?4:"dw"==Oa?2:1,$b=mb*Zb||128,qg=$b+15>>4||1;qg--&&0<$b;){var ac=0,Qc=0,nb,Rc="",De="",ia=I(a,Yb.w);for(nb=4==mb?16:a.ia;0<nb&&0<$b;nb--){var bc=a.Ua(Yb,1),ac=ac|bc<<(Qc++<<3);Qc==mb&&(Rc+=I(a,ac,mb),Rc+=1==mb?9==nb?"-":" ":"  ",ac=
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g[0]){var Yc;var pb=b.substr(2),pb=oa(pb);mf(a,pb)?(c||a.i("true: "+pb),Yc=!0):(c||a.i("false: "+pb),Yc=!1);Yc||(d=!1);break}f=!0;break;case "k":var tg=g[0];if("?"==g[1])a.i("stack trace commands:"),a.i("\tk\tshow frame addresses"),a.i("\tks\tshow symbol information");else{var Zc=0,$c=X(),qb=X(a.b.u[6]);for(a.i("stack trace for "+I(a,qb.w));10>Zc;){for(var Aa=null,ug=256;65536>qb.w>>>0;){$c.w=a.ma(qb,2);if(null==qb.w||!ug--)break;if(!($c.w&1)){for(var vg=a,ec=$c,Fe=null,rb=ec.w,Ge=rb,ad=1;6>=ad&&
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0;if("all"==E)ta=1878917119,E=null;else if("on"==E)la=!0,E=null;else if("off"==E)la=!1,E=null;else{"keys"==E&&(E="key");"kbd"==E&&(E="keyboard");for(ka in xb)if(E==ka){ta=xb[ka];la=!!(a.ha&ta);break}if(!ta){a.i("unknown message category: "+E);break a}}if(ta)if("on"==g[2])a.ha|=ta,la=!0;else if("off"==g[2]&&(a.ha&=~ta,la=!1,1073741824==ta)){for(var bd=0;bd<a.wa.length;bd++)a.i(a.wa[bd]);a.wa=[]}}var wg=0,sb="";for(ka in xb)if(!E||E==ka){var xg=!!(a.ha&xb[ka]);if(null===la||la==xg)sb&&(sb+=","),++wg%
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