mirror of
https://github.com/holub/mame
synced 2025-10-06 00:54:22 +03:00
454 lines
13 KiB
C
454 lines
13 KiB
C
/*****************************************************************************
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*
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* pps4.c
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*
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* Rockwell PPS-4 CPU
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*
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* Initial version by Miodrag Milanovic
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*
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*****************************************************************************/
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#include "emu.h"
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#include "debugger.h"
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#include "pps4.h"
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#define VERBOSE 0
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#define LOG(x) do { if (VERBOSE) logerror x; } while (0)
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/***************************************************************************
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TYPE DEFINITIONS
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***************************************************************************/
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struct pps4_state
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{
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UINT8 A; // Accumulator
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UINT8 X;
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PAIR P;
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PAIR SA;
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PAIR SB;
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PAIR B; // BU + BM + BL
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UINT8 C; // Carry flag
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UINT8 FF1; // Flip-flop 1
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UINT8 FF2; // Flip-flop 2
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legacy_cpu_device *device;
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address_space *program;
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direct_read_data *direct;
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address_space *data;
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address_space *io;
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int icount;
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};
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/***************************************************************************
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INLINE FUNCTIONS
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***************************************************************************/
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INLINE pps4_state *get_safe_token(device_t *device)
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{
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assert(device != NULL);
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assert(device->type() == PPS4);
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return (pps4_state *)downcast<legacy_cpu_device *>(device)->token();
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}
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INLINE UINT8 ROP(pps4_state *cpustate)
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{
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UINT8 retVal = cpustate->direct->read_decrypted_byte(cpustate->P.w.l);
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cpustate->P.w.l = (cpustate->P.w.l + 1) & 0x0fff;
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return retVal;
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}
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INLINE UINT8 ARG(pps4_state *cpustate)
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{
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UINT8 retVal = cpustate->direct->read_raw_byte(cpustate->P.w.l);
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cpustate->P.w.l = (cpustate->P.w.l + 1) & 0x0fff;
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return retVal;
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}
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INLINE void DO_SKIP(pps4_state *cpustate)
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{
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cpustate->P.w.l = (cpustate->P.w.l + 1) & 0x0fff;
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}
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static void execute_one(pps4_state *cpustate, int opcode)
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{
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cpustate->icount -= 1;
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switch (opcode)
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{
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// Arithmetic instructions
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case 0x0b: // AD
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break;
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case 0x0a: // ADC
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break;
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case 0x09: // ADSK
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break;
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case 0x08: // ADCSK
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break;
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case 0x60: case 0x61: case 0x62: case 0x63:
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case 0x64: case 0x66: case 0x67: case 0x68:
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case 0x69: case 0x6a: case 0x6b: case 0x6c:
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case 0x6d: case 0x6e:
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// ADI
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break;
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case 0x65: //DC
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cpustate->A = (cpustate->A + 10) & 0x0f;
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break;
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// Logical instructions
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case 0x0d: // AND
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break;
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case 0x0f: // OR
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break;
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case 0x0c: // EOR
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break;
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case 0x0e: // COMP
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cpustate->A ^= 0x0f;
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break;
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// Data transfer instructions
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case 0x20: // SC
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cpustate->C = 1;
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break;
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case 0x24: //RC
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cpustate->C = 0;
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break;
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case 0x22: // SF1
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cpustate->FF1 = 1;
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break;
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case 0x26: // RF1
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cpustate->FF1 = 0;
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break;
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case 0x21: // SF2
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cpustate->FF2 = 1;
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break;
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case 0x25: // RF2
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cpustate->FF2 = 0;
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break;
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case 0x30: case 0x31: case 0x32: case 0x33:
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case 0x34: case 0x35: case 0x36: case 0x37:
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// LD
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break;
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case 0x38: case 0x39: case 0x3a: case 0x3b:
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case 0x3c: case 0x3d: case 0x3e: case 0x3f:
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// EX
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break;
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case 0x28: case 0x29: case 0x2a: case 0x2b:
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case 0x2c: case 0x2d: case 0x2e: case 0x2f:
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// EXD
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break;
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case 0x70: case 0x71: case 0x72: case 0x73:
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case 0x74: case 0x75: case 0x76: case 0x77:
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case 0x78: case 0x79: case 0x7a: case 0x7b:
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case 0x7c: case 0x7d: case 0x7e: case 0x7f:
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// LDI
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cpustate->A = opcode & 0x0f;
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break;
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case 0x12: // LAX
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cpustate->A = cpustate->X;
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break;
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case 0x1b: // LXA
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cpustate->X = cpustate->A;
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break;
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case 0x11: // LABL
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cpustate->A = cpustate->B.w.l & 0x00f;
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break;
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case 0x10: // LBMX
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cpustate->B.w.l &= 0xf0f;
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cpustate->B.w.l |= (cpustate->X << 4);
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break;
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case 0x04: // LBUA
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break;
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case 0x19: // XABL
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{
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UINT8 tmp = cpustate->B.w.l & 0x00f;
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cpustate->B.w.l &= 0xff0;
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cpustate->B.w.l |= cpustate->A;
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cpustate->A = tmp;
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}
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break;
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case 0x18: // XBMX
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{
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UINT8 tmp = (cpustate->B.w.l & 0x0f0) >> 4;
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cpustate->B.w.l &= 0xf0f;
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cpustate->B.w.l |= (cpustate->X << 4);
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cpustate->X = tmp;
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}
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break;
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case 0x1a: // XAX
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{
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UINT8 tmp = cpustate->A;
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cpustate->A = cpustate->X;
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cpustate->X = tmp;
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}
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break;
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case 0x06: // XS
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{
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PAIR tmp = cpustate->SA;
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cpustate->SA = cpustate->SB;
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cpustate->SB = tmp;
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}
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break;
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case 0x6f: // CYS
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break;
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case 0xc0: case 0xc1: case 0xc2: case 0xc3:
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case 0xc4: case 0xc5: case 0xc6: case 0xc7:
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case 0xc8: case 0xc9: case 0xca: case 0xcb:
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case 0xcc: case 0xcd: case 0xce: case 0xcf:
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// LB
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{
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//UINT8 tmp = ARG(cpustate);
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cpustate->icount -= 1;
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}
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break;
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case 0x00: // LBL
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{
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UINT8 tmp = ARG(cpustate);
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cpustate->icount -= 1;
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cpustate->B.w.l = tmp;
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}
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break;
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case 0x17: // INCB
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if ((cpustate->B.w.l & 0x0f) == 0x0f) {
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cpustate->B.w.l &= 0xff0;
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DO_SKIP(cpustate);
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} else {
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cpustate->B.w.l += 1;
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}
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break;
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case 0x1f: // DECB
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if ((cpustate->B.w.l & 0x0f) == 0x00) {
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cpustate->B.w.l |= 0x00f;
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DO_SKIP(cpustate);
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} else {
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cpustate->B.w.l -= 1;
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}
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break;
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// Control transfer instructions
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case 0x80: case 0x81: case 0x82: case 0x83:
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case 0x84: case 0x85: case 0x86: case 0x87:
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case 0x88: case 0x89: case 0x8a: case 0x8b:
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case 0x8c: case 0x8d: case 0x8e: case 0x8f:
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case 0x90: case 0x91: case 0x92: case 0x93:
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case 0x94: case 0x95: case 0x96: case 0x97:
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case 0x98: case 0x99: case 0x9a: case 0x9b:
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case 0x9c: case 0x9d: case 0x9e: case 0x9f:
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case 0xa0: case 0xa1: case 0xa2: case 0xa3:
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case 0xa4: case 0xa5: case 0xa6: case 0xa7:
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case 0xa8: case 0xa9: case 0xaa: case 0xab:
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case 0xac: case 0xad: case 0xae: case 0xaf:
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case 0xb0: case 0xb1: case 0xb2: case 0xb3:
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case 0xb4: case 0xb5: case 0xb6: case 0xb7:
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case 0xb8: case 0xb9: case 0xba: case 0xbb:
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case 0xbc: case 0xbd: case 0xbe: case 0xbf:
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// T
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cpustate->P.w.l = (cpustate->P.w.l & 0xfc0) | (opcode & 0x3f);
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break;
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case 0xd0: case 0xd1: case 0xd2: case 0xd3:
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case 0xd4: case 0xd5: case 0xd6: case 0xd7:
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case 0xd8: case 0xd9: case 0xda: case 0xdb:
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case 0xdc: case 0xdd: case 0xde: case 0xdf:
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case 0xe0: case 0xe1: case 0xe2: case 0xe3:
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case 0xe4: case 0xe5: case 0xe6: case 0xe7:
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case 0xe8: case 0xe9: case 0xea: case 0xeb:
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case 0xec: case 0xed: case 0xee: case 0xef:
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case 0xf0: case 0xf1: case 0xf2: case 0xf3:
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case 0xf4: case 0xf5: case 0xf6: case 0xf7:
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case 0xf8: case 0xf9: case 0xfa: case 0xfb:
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case 0xfc: case 0xfd: case 0xfe: case 0xff:
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// TM
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break;
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case 0x50: case 0x51: case 0x52: case 0x53:
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case 0x54: case 0x55: case 0x56: case 0x57:
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case 0x58: case 0x59: case 0x5a: case 0x5b:
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case 0x5c: case 0x5d: case 0x5e: case 0x5f:
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// TL
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{
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//UINT8 tmp = ARG(cpustate);
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cpustate->icount -= 1;
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}
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break;
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case 0x01: case 0x02: case 0x03:
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// TML
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{
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//UINT8 tmp = ARG(cpustate);
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cpustate->icount -= 1;
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}
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break;
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case 0x15: // SKC
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break;
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case 0x1e: // SKZ
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break;
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case 0x40: case 0x41: case 0x42: case 0x43:
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case 0x44: case 0x45: case 0x46: case 0x47:
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case 0x48: case 0x49: case 0x4a: case 0x4b:
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case 0x4c: case 0x4d: case 0x4e: case 0x4f:
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// SKBI
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break;
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case 0x16: // SKF1
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break;
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case 0x14: // SKF2
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break;
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case 0x05: // RTN
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break;
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case 0x07: // RTNSK
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break;
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// Input/Output instructions
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case 0x1c: // IOL
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{
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//UINT8 tmp = ARG(cpustate);
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cpustate->icount -= 1;
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}
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break;
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case 0x27: // DIA
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break;
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case 0x23: // DIB
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break;
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case 0x1d: // DOA
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break;
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// Special instructions
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case 0x13: // SAG
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break;
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}
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}
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/***************************************************************************
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COMMON EXECUTION
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***************************************************************************/
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static CPU_EXECUTE( pps4 )
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{
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pps4_state *cpustate = get_safe_token(device);
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do
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{
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debugger_instruction_hook(device, cpustate->P.d);
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execute_one(cpustate, ROP(cpustate));
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} while (cpustate->icount > 0);
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}
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/***************************************************************************
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CORE INITIALIZATION
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***************************************************************************/
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static CPU_INIT( pps4 )
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{
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pps4_state *cpustate = get_safe_token(device);
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cpustate->device = device;
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cpustate->program = device->space(AS_PROGRAM);
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cpustate->direct = &cpustate->program->direct();
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cpustate->data = device->space(AS_DATA);
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cpustate->io = device->space(AS_IO);
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device->save_item(NAME(cpustate->A));
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device->save_item(NAME(cpustate->X));
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device->save_item(NAME(cpustate->P));
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device->save_item(NAME(cpustate->SA));
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device->save_item(NAME(cpustate->SB));
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device->save_item(NAME(cpustate->B));
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device->save_item(NAME(cpustate->C));
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device->save_item(NAME(cpustate->FF1));
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device->save_item(NAME(cpustate->FF2));
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}
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/***************************************************************************
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COMMON RESET
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***************************************************************************/
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static CPU_RESET( pps4 )
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{
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pps4_state *cpustate = get_safe_token(device);
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cpustate->A = cpustate->X = 0;
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cpustate->C = cpustate->FF1 = cpustate->FF2 = 0;
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cpustate->P.d = 0;
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cpustate->SA.d = 0;
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cpustate->SB.d = 0;
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cpustate->B.d = 0;
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}
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/***************************************************************************
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COMMON STATE IMPORT/EXPORT
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***************************************************************************/
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static CPU_IMPORT_STATE( pps4 )
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{
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}
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static CPU_EXPORT_STATE( pps4 )
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{
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}
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/***************************************************************************
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COMMON SET INFO
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***************************************************************************/
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static CPU_SET_INFO( pps4 )
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{
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}
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/***************************************************************************
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PPS4 GET INFO
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***************************************************************************/
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CPU_GET_INFO( pps4 )
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{
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pps4_state *cpustate = (device != NULL && device->token() != NULL) ? get_safe_token(device) : NULL;
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switch (state)
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{
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/* --- the following bits of info are returned as 64-bit signed integers --- */
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case CPUINFO_INT_CONTEXT_SIZE: info->i = sizeof(pps4_state); break;
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case CPUINFO_INT_INPUT_LINES: info->i = 0; break;
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case CPUINFO_INT_DEFAULT_IRQ_VECTOR: info->i = 0; break;
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case CPUINFO_INT_ENDIANNESS: info->i = ENDIANNESS_LITTLE; break;
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case CPUINFO_INT_CLOCK_MULTIPLIER: info->i = 1; break;
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case CPUINFO_INT_CLOCK_DIVIDER: info->i = 1; break;
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case CPUINFO_INT_MIN_INSTRUCTION_BYTES: info->i = 1; break;
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case CPUINFO_INT_MAX_INSTRUCTION_BYTES: info->i = 2; break;
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case CPUINFO_INT_MIN_CYCLES: info->i = 1; break;
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case CPUINFO_INT_MAX_CYCLES: info->i = 2; break;
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case CPUINFO_INT_DATABUS_WIDTH + AS_PROGRAM: info->i = 8; break;
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case CPUINFO_INT_ADDRBUS_WIDTH + AS_PROGRAM: info->i = 12; break;
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case CPUINFO_INT_ADDRBUS_SHIFT + AS_PROGRAM: info->i = 0; break;
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case CPUINFO_INT_DATABUS_WIDTH + AS_DATA: info->i = 8; break; // 4 bit for RAM
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case CPUINFO_INT_ADDRBUS_WIDTH + AS_DATA: info->i = 12; break;
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case CPUINFO_INT_ADDRBUS_SHIFT + AS_DATA: info->i = 0; break;
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case CPUINFO_INT_DATABUS_WIDTH + AS_IO: info->i = 8; break; // 4 bit
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case CPUINFO_INT_ADDRBUS_WIDTH + AS_IO: info->i = 8; break;
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case CPUINFO_INT_ADDRBUS_SHIFT + AS_IO: info->i = 0; break;
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/* --- the following bits of info are returned as pointers to functions --- */
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case CPUINFO_FCT_SET_INFO: info->setinfo = CPU_SET_INFO_NAME(pps4); break;
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case CPUINFO_FCT_INIT: info->init = CPU_INIT_NAME(pps4); break;
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case CPUINFO_FCT_RESET: info->reset = CPU_RESET_NAME(pps4); break;
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case CPUINFO_FCT_EXECUTE: info->execute = CPU_EXECUTE_NAME(pps4); break;
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case CPUINFO_FCT_DISASSEMBLE: info->disassemble = CPU_DISASSEMBLE_NAME(pps4); break;
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case CPUINFO_FCT_IMPORT_STATE: info->import_state = CPU_IMPORT_STATE_NAME(pps4); break;
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case CPUINFO_FCT_EXPORT_STATE: info->export_state = CPU_EXPORT_STATE_NAME(pps4); break;
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/* --- the following bits of info are returned as pointers --- */
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case CPUINFO_PTR_INSTRUCTION_COUNTER: info->icount = &cpustate->icount; break;
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/* --- the following bits of info are returned as NULL-terminated strings --- */
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case CPUINFO_STR_NAME: strcpy(info->s, "PPS4"); break;
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case CPUINFO_STR_FAMILY: strcpy(info->s, "Rockwell PPS-4"); break;
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case CPUINFO_STR_VERSION: strcpy(info->s, "1.0"); break;
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case CPUINFO_STR_SOURCE_FILE: strcpy(info->s, __FILE__); break;
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case CPUINFO_STR_CREDITS: strcpy(info->s, "Copyright Miodrag Milanovic"); break;
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case CPUINFO_STR_FLAGS:
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sprintf(info->s, "%c%c%c",
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cpustate->C ? 'C':'.',
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cpustate->FF1 ? '1':'.',
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cpustate->FF2 ? '2':'.');
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break;
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}
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}
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DEFINE_LEGACY_CPU_DEVICE(PPS4, pps4);
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