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Clean up CF handling (no more direct manipulation of result variables)

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This commit is contained in:
Jeff Parsons 2016-05-12 11:11:19 -07:00
commit 9a0e5cddc6
4 changed files with 25 additions and 44 deletions
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12
modules/pc8080/lib/cpudef.js
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@ -71,7 +71,7 @@ var CPUDef = {
SF: 0x0080, // bit 7: Sign flag
ALL: 0x00D5, // all "arithmetic" flags (CF, PF, AF, ZF, SF)
MASK: 0x00FF, //
IF: 0x0200 // bit 9: Interrupt flag (for internal use only)
IF: 0x0200 // bit 9: Interrupt flag (set if interrupts enabled; for internal use only)
},
PARITY: [ // 256-byte array with a 1 wherever the number of set bits of the array index is EVEN
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
@ -92,21 +92,21 @@ var CPUDef = {
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1
],
/*
* Bit values for intFlags
* Interrupt-related flags (stored in intFlags)
*/
INTFLAG: {
NONE: 0x00,
INTL: 0x07, // last interrupt level requested
INTR: 0x08, // set if interrupt has been requested
HALT: 0x10 // halt requested; see the HLT opcode
HALT: 0x10 // halt requested; see opHLT()
},
/*
* Opcode definitions
*/
OPCODE: {
HLT: 0x76,
ACI: 0xCE, // PS.ALL
CALL: 0xCD,
HLT: 0x76, // Halt
ACI: 0xCE, // Add with Carry Immediate (affects PS.ALL)
CALL: 0xCD, // Call
RST0: 0xC7
// to be continued....
}