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Minor Debugger improvements, notes, etc, while debugging the PDP-11 BASIC

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This commit is contained in:
Jeff Parsons 2016-10-20 22:56:29 -07:00 • committed by Jeff Parsons
commit aa2a25c5ec
7 changed files with 163 additions and 94 deletions
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15
modules/pdp11/lib/defines.js
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@ -189,7 +189,8 @@ var PDP11 = {
* Assorted common opcodes
*/
OPCODE: {
HALT: 0x0000
HALT: 0x0000,
INVALID: 0xFFFF // far from the only invalid opcode, just a KNOWN invalid opcode
},
/*
* Internal operation state flags
@ -249,13 +250,13 @@ var PDP11 = {
UNDEFINED: 0x00, // 000 (reserved)
BUS_ERROR: 0x04, // 004 illegal instructions, bus errors, stack limit, illegal internal address, microbreak
RESERVED: 0x08, // 010 reserved instructions
BREAKPOINT: 0x0C, // 014 BPT, breakpoint trap (trace)
IOT: 0x10, // 020 IOT, input/output trap
POWER_FAIL: 0x14, // 024 power fail
EMULATOR: 0x18, // 030 EMT, emulator trap
BPT: 0x0C, // 014 BPT: breakpoint trap (trace)
IOT: 0x10, // 020 IOT: input/output trap
PF: 0x14, // 024 power fail
EMT: 0x18, // 030 EMT: emulator trap
TRAP: 0x1C, // 034 TRAP instruction
PIRQ: 0xA0, // 240 PIRQ, program interrupt request
MMU_FAULT: 0xA8 // 250 MMU aborts and traps
PIRQ: 0xA0, // 240 PIRQ: program interrupt request
MMU: 0xA8 // 250 MMU: aborts and traps
},
/*
* PDP-11 trap reasons (for diagnostic purposes only)