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Fixed lost 8080 interrupts, and added new CPU-driven setTimer() functionality

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This commit is contained in:
Jeff Parsons 2016-08-17 11:58:01 -07:00
commit 99023617fd
6 changed files with 562 additions and 447 deletions
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19
modules/pc8080/lib/cpudef.js
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@ -60,17 +60,17 @@ var CPUDef = {
* Processor Status flag definitions (stored in regPS)
*/
PS: {
CF: 0x0001, // bit 0: Carry flag
CF: 0x0001, // bit 0: Carry Flag
BIT1: 0x0002, // bit 1: reserved, always set
PF: 0x0004, // bit 2: Parity flag
PF: 0x0004, // bit 2: Parity Flag
BIT3: 0x0008, // bit 3: reserved, always clear
AF: 0x0010, // bit 4: Auxiliary Carry flag
AF: 0x0010, // bit 4: Auxiliary Carry Flag
BIT5: 0x0020, // bit 5: reserved, always clear
ZF: 0x0040, // bit 6: Zero flag
SF: 0x0080, // bit 7: Sign flag
ZF: 0x0040, // bit 6: Zero Flag
SF: 0x0080, // bit 7: Sign Flag
ALL: 0x00D5, // all "arithmetic" flags (CF, PF, AF, ZF, SF)
MASK: 0x00FF, //
IF: 0x0200 // bit 9: Interrupt flag (set if interrupts enabled; for internal use only)
IF: 0x0200 // bit 9: Interrupt Flag (set if interrupts enabled; Intel calls this the INTE bit)
},
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,
@ -94,10 +94,9 @@ var CPUDef = {
* 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 opHLT()
NONE: 0x0000,
INTR: 0x00ff, // mask for 8 bits, representing interrupt levels 0-7
HALT: 0x0100 // halt requested; see opHLT()
},
/*
* Opcode definitions