285 lines
14 KiB
JavaScript
285 lines
14 KiB
JavaScript
/**
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* @fileoverview PDP10-specific compile-time definitions.
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* @author <a href="mailto:Jeff@pcjs.org">Jeff Parsons</a>
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* @copyright © Jeff Parsons 2012-2017
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*
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* This file is part of PCjs, a computer emulation software project at <http://pcjs.org/>.
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*
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* PCjs is free software: you can redistribute it and/or modify it under the terms of the
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* GNU General Public License as published by the Free Software Foundation, either version 3
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* of the License, or (at your option) any later version.
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*
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* PCjs is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
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* even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with PCjs. If not,
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* see <http://www.gnu.org/licenses/gpl.html>.
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*
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* You are required to include the above copyright notice in every modified copy of this work
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* and to display that copyright notice when the software starts running; see COPYRIGHT in
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* <http://pcjs.org/modules/shared/lib/defines.js>.
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*
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* Some PCjs files also attempt to load external resource files, such as character-image files,
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* ROM files, and disk image files. Those external resource files are not considered part of PCjs
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* for purposes of the GNU General Public License, and the author does not claim any copyright
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* as to their contents.
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*/
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"use strict";
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/**
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* @define {string}
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*/
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var APPCLASS = "pdp10"; // this @define is the default application class (eg, "pcx86", "c1pjs")
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/**
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* APPNAME is used more for display purposes than anything else now. APPCLASS is what matters in terms
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* of folder and file names, CSS styles, etc.
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*
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* @define {string}
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*/
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var APPNAME = "PDPjs"; // this @define is the default application name (eg, "PCx86", "C1Pjs")
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/**
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* WARNING: DEBUGGER needs to accurately reflect whether or not the Debugger component is (or will be) loaded.
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* In the compiled case, we rely on the Closure Compiler to override DEBUGGER as appropriate. When it's *false*,
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* nearly all of debugger.js will be conditionally removed by the compiler, reducing it to little more than a
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* "type skeleton", which also solves some type-related warnings we would otherwise have if we tried to remove
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* debugger.js from the compilation process altogether.
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*
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* However, when we're in "development mode" and running uncompiled code in debugger-less configurations,
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* I would like to skip loading debugger.js altogether. When doing that, we must ALSO arrange for an additional file
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* (nodebugger.js) to be loaded immediately after this file, which *explicitly* overrides DEBUGGER with *false*.
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*
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* @define {boolean}
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*/
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var DEBUGGER = true; // this @define is overridden by the Closure Compiler to remove Debugger-related support
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/*
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* Set this to true to enable behavior compatible with SIMH.
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*/
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var SIMH = false;
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/*
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* Combine all the shared globals and machine-specific globals into one machine-specific global object,
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* which all machine components should start using; eg: "if (PDP10.DEBUG) ..." instead of "if (DEBUG) ...".
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*/
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var PDP10 = {
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APPCLASS: APPCLASS,
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APPNAME: APPNAME,
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APPVERSION: APPVERSION, // shared
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COMPILED: COMPILED, // shared
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CSSCLASS: CSSCLASS, // shared
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DEBUG: DEBUG, // shared
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DEBUGGER: DEBUGGER,
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MAXDEBUG: MAXDEBUG, // shared
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PRIVATE: PRIVATE, // shared
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SITEHOST: SITEHOST, // shared
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XMLVERSION: XMLVERSION, // shared
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/*
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* CPU model numbers (supported)
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*/
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MODEL_KA10: 1001,
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/*
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* ADDR_INVALID is used to mark points in the code where the physical address being returned
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* is invalid and should not be used.
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*
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* In a 32-bit CPU, -1 (ie, 0xffffffff) could actually be a valid address, so consider changing
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* ADDR_INVALID to NaN or null (which is also why all ADDR_INVALID tests should use strict equality
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* operators).
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*
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* The main reason I'm NOT using NaN or null now is my concern that, by mixing non-numbers
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* (specifically, values outside the range of signed 32-bit integers), performance may suffer.
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*
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* WARNING: Like many of the properties defined here, ADDR_INVALID is a common constant, which the
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* Closure Compiler will happily inline (with or without @const annotations; in fact, I've yet to
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* see a @const annotation EVER improve automatic inlining). However, if you don't make ABSOLUTELY
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* certain that this file is included BEFORE the first reference to any of these properties, that
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* automatic inlining will no longer occur.
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*/
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ADDR_INVALID: -1,
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ADDR_MASK: Math.pow(2, 18) - 1,
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ADDR_LIMIT: Math.pow(2, 18),
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/*
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* 18-bit and 36-bit largest positive (and smallest negative) values; however, since we store all
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* values as unsigned quantities, these are the unsigned equivalents.
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*/
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WORD_INVALID: -1,
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HINT_MASK: Math.pow(2, 17) - 1, // 131,071 (377777) signed half-word (half-int) mask
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HALF_MASK: Math.pow(2, 18) - 1, // 262,143 (000000 777777): unsigned half-word mask
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HALF_SHIFT: Math.pow(2, 18), // 262,144 (000001 000000): unsigned half-word shift
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INT_MASK: Math.pow(2, 35) - 1, // 34,359,738,367 (377777 777777): signed word (magnitude) mask
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INT_LIMIT: Math.pow(2, 35), // 34,359,738,368 (400000 000000): signed word (magnitude) limit
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WORD_MASK: Math.pow(2, 36) - 1, // 68,719,476,735 (777777 777777): unsigned word mask
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WORD_LIMIT: Math.pow(2, 36), // 68,719,476,736 (1 000000 000000): unsigned word limit
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TWO_POW32: Math.pow(2, 32),
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TWO_POW34: Math.pow(2, 34),
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TWO_POW36: Math.pow(2, 36), // the two's complement of a 36-bit value is (value? TWO_POW36 - value : 0)
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/*
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* PDP-10 opcodes are 36-bit values, most of which use the following layout:
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*
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* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3 3 3 3 3
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
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* O O O O O O O M M A A A A I X X X X Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y
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*
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* or using modern bit-numbering:
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*
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* 3 3 3 3 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1
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* 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
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* O O O O O O O M M A A A A I X X X X Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y
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*
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* where OOOOOOOMM represents the operation, and MM (if used) represents the mode:
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*
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* Mode Suffix Source Destination
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* ---- ------ ----- -----------
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* 0: Basic None E AC
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* 1: Immediate I 0,E AC
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* 2: Memory M AC E
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* 3: Self/Both S or B E E (and AC if A is non-zero)
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*
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* Input-output instructions look like:
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*
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* 3 3 3 3 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1
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* 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
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* 1 1 1 D D D D D D D O O O I X X X X Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y
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*
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* Bits 0-22 (I,X,Y) contain what we call a "reference address" (R), which is used to calculate the
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* "effective address" (E). To determine E from R, we must extract I, X, and Y from R, set E to Y,
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* then add [X] to E if X is non-zero. If I is zero, then we're done; otherwise, we must set R to [E]
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* and repeat the process.
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*/
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OPCODE: {
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OPMASK: 0o77700, // operation mask
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OPMODE: 0o77400, // operation with mode
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OPCOMP: 0o77000, // operation with compare
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OPTEST: 0o71100, // operation with test
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OPIO: 0o70034, // input-output operation
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OPUUO: 0o70000, // unimplemented user operation (UUO) mask
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OP_SCALE: Math.pow(2, 21), // operation scale
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IO_SCALE: Math.pow(2, 26), // input-output device code scale
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IO_MASK: 0o177, // input-output device code mask (after descale)
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A_SCALE: Math.pow(2, 23), // used to shift down the high 13 bits, with A starting at bit 0
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P_SCALE: Math.pow(2, 30), // P scale
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P_MASK: 0o77, // P mask (after descale)
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S_SHIFT: 24, // S shift
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S_MASK: 0o77, // S mask (after shift)
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A_SHIFT: 23, // A shift
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A_MASK: 0o17, // A mask (after shift)
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I_BIT: 0o20000000, // indirect bit
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X_SHIFT: 18, // X shift
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X_MASK: 0o17, // X mask (after shift)
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Y_MASK: 0o777777, // Y mask
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R_MASK: 0o37777777, // used to isolate the low 23 bits (I,X,Y)
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PTR_MASK: 0o77777777, // used to isolate the low 24 bits (?,I,X,Y) of a byte pointer
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HALT: 0o5304 // operation code for HALT
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},
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/*
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* Internal operation state flags
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*/
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OPFLAG: {
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IRQ_DELAY: 0x0001, // incremented until it becomes IRQ
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IRQ: 0x0002, // time to call checkInterrupts()
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IRQ_MASK: 0x0003,
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DEBUGGER: 0x0004, // set if the Debugger wants to perform checks
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WAIT: 0x0008, // WAIT operation in progress
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PRESERVE: 0x000F // OPFLAG bits to preserve prior to the next instruction
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},
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/*
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* Flags returned by getPS() for various program control operations.
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*
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* NOTE: I see SIMH setting PS bits like 0o000200 and 0o000400, which are not documented for the KA10.
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* The SIMH docs only refer to the KS10 ("KS10 CPU with 1MW of memory"), so I'm guessing it doesn't have
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* a KA10 emulation option. The `pdp10` SIMH binary does have some SET CPU options, but unlike the `pdp11`
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* binary, the only options you can set relate to the operating system to be run -- which seems very hacky.
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*/
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PSFLAG: {
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OVFL: 0o400000, // Overflow
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CARRY0: 0o200000, // Carry 0
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CARRY1: 0o100000, // Carry 1
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FP_OVFL: 0o040000, // Floating-Point Overflow
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BYTE_INT: 0o020000, // Byte Interrupt
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USER_MODE: 0o010000, // Processor is in User Mode
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USER_IO: 0o004000, // User I/O
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FP_UNFL: 0o000100, // Floating-Point Underflow
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NO_DIVIDE: 0o000040, // No Divide
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/*
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* Only the low 18 bits (above) are returned by getPS(); the following (bits 18 to 31)
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* are defined for internal use only.
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*/
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PD_OVFL: 0o1000000 // Pushdown Overflow
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},
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/*
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* Readable CPU (or APR for "Arithmetic Processor") flags provided by the "CONI APR," instruction; see opCONI().
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*/
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RFLAG: {
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PIA: 0o000007, // Priority Interrupt Assignment
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OVFL: 0o000010, // Overflow
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OVFL_IE: 0o000020, // Overflow Interrupt Enabled
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TRAP_OFF: 0o000040, // Trap Offset
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FP_OVFL: 0o000100, // Floating-Point Overflow
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FP_OVFL_IE: 0o000200, // Floating-Point Overflow Interrupt Enabled
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CLOCK: 0o001000, // Clock Flag
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CLOCK_IE: 0o002000, // Clock Interrupt Enabled
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NXM: 0o010000, // Non-Existent Memory
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PRM: 0o020000, // Memory Protection
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ADB: 0o040000, // Address Break
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UIO: 0o100000, // User In-Out
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PD_OVFL: 0o200000 // Pushdown Overflow (TODO: Verify this is correct; the May 1968 doc may have a typo)
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},
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/*
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* Writable CPU (or APR for "Arithmetic Processor") flags provided by the "CONO APR," instruction; see opCONO().
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*
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* A set bit performs the function shown below, a clear bit does nothing.
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*/
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WFLAG: {
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PIA: 0o000007, // Priority Interrupt Assignment
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OVFL_CL: 0o000010, // Clear Overflow
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OVFL_IE: 0o000020, // Enable Overflow Interrupt
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OVFL_ID: 0o000040, // Disable Overflow Interrupt
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FP_OVFL_CL: 0o000100, // Clear Floating-Point Overflow
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FP_OVFL_IE: 0o000200, // Enable Floating-Point Overflow Interrupt
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FP_OVFL_ID: 0o000400, // Disable Floating-Point Overflow Interrupt
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CLOCK_CL: 0o001000, // Clear Clock Flag
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CLOCK_IE: 0o002000, // Enable Clock Interrupt
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CLOCK_ID: 0o004000, // Disable Clock Interrupt
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NXM_CL: 0o010000, // Clear Non-Existent Memory
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PRM_CL: 0o020000, // Clear Memory Protection
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ADB_CL: 0o040000, // Clear Address Break
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UIO_CL: 0o200000, // Clear All In-Out Devices
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PD_OVFL_CL: 0o400000 // Clear Pushdown Overflow
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},
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/*
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* 7-bit device codes used by Input-Output instructions; see opIO().
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*/
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DEVICES: {
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APR: 0o000, // Arithmetic Processor
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PI: 0o001 // Priority Interrupt
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}
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};
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/*
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* Combine all the shared globals and machine-specific globals into one machine-specific global object,
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* which all machine components should start using; eg: "if (PDP10.DEBUGGER)" instead of "if (DEBUGGER)".
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*/
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PDP10.APPCLASS = APPCLASS;
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PDP10.APPNAME = APPNAME;
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PDP10.DEBUGGER = DEBUGGER;
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if (NODE) {
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global.APPCLASS = APPCLASS;
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global.APPNAME = APPNAME;
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global.DEBUGGER = DEBUGGER;
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global.PDP10 = PDP10;
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module.exports = PDP10;
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}
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