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More decoding functions

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This commit is contained in:
Jeff 2016-09-23 13:16:12 -07:00 • committed by Jeff Parsons
commit 9d045008a3
6 changed files with 672 additions and 512 deletions
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19
modules/pdp11/lib/defines.js
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@ -210,13 +210,22 @@ var PDP11 = {
PIRQ: 0xA0, // 240 PIRQ, program interrupt request
MMU_FAULT: 0xA8 // 250 MMU aborts and traps
},
BYTE_MODE: 1,
READ_MODE: 2,
WRITE_MODE: 4,
MODIFY_WORD: 2 | 4, // READ_MODE | WRITE_MODE
MODIFY_BYTE: 1 | 2 | 4 // READ_MODE | WRITE_MODE | BYTE_MODE
ACCESS: {
WORD: 0x0,
BYTE: 0x1,
READ: 0x2,
WRITE: 0x4,
UPDATE: 0x6
}
};
PDP11.ACCESS.READ = PDP11.ACCESS.WORD | PDP11.ACCESS.READ; // formerly READ_MODE (2)
PDP11.ACCESS.READ_BYTE = PDP11.ACCESS.BYTE | PDP11.ACCESS.READ; // formerly READ_MODE (2) | BYTE_MODE (1)
PDP11.ACCESS.WRITE = PDP11.ACCESS.WORD | PDP11.ACCESS.WRITE; // formerly WRITE_MODE (4)
PDP11.ACCESS.WRITE_BYTE = PDP11.ACCESS.BYTE | PDP11.ACCESS.WRITE; // formerly WRITE_MODE (4) | BYTE_MODE (1)
PDP11.ACCESS.UPDATE = PDP11.ACCESS.WORD | PDP11.ACCESS.UPDATE; // formerly MODIFY_WORD (2 | 4)
PDP11.ACCESS.UPDATE_BYTE = PDP11.ACCESS.BYTE | PDP11.ACCESS.UPDATE; // formerly MODIFY_BYTE (1 | 2 | 4)
/*
* PSW arithmetic flags are NOT stored directly into the PSW register; they are maintained across separate
* flag registers.