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cpucore.cpp
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#include "cpucore.h"
#include "timer.h"
#include "mem.h"
#include "Altair8800.h"
union unionBC regBC;
union unionDE regDE;
union unionHL regHL;
byte regS, regA;
uint16_t regSP;
union unionPC regPCU;
#define setCarryBit(v) if(v) regS |= PS_CARRY; else regS &= ~PS_CARRY
#define setHalfCarryBit(v) if(v) regS |= PS_HALFCARRY; else regS &= ~PS_HALFCARRY
static const byte halfCarryTableAdd[] = { 0, 0, 1, 0, 1, 0, 1, 1 };
static const byte halfCarryTableSub[] = { 1, 0, 0, 0, 1, 1, 1, 0 };
#define setHalfCarryBitAdd(opd1, opd2, res) setHalfCarryBit(halfCarryTableAdd[((((opd1) & 0x08) / 2) | (((opd2) & 0x08) / 4) | (((res) & 0x08) / 8)) & 0x07])
#define setHalfCarryBitSub(opd1, opd2, res) setHalfCarryBit(halfCarryTableSub[((((opd1) & 0x08) / 2) | (((opd2) & 0x08) / 4) | (((res) & 0x08) / 8)) & 0x07])
static const byte parity_table[256] =
{1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1};
inline void setStatusBits(byte value)
{
byte b;
b = regS & ~(PS_ZERO|PS_SIGN|PS_PARITY);
if( parity_table[value] ) b |= PS_PARITY;
if( value==0 ) b |= PS_ZERO;
b |= (value & PS_SIGN);
regS = b;
}
inline uint16_t MEM_READ_WORD(uint16_t addr)
{
if( host_read_status_led_WAIT() )
{
byte l, h;
l = MEM_READ_STEP(addr);
addr++;
h = MEM_READ_STEP(addr);
return l | (h * 256);
}
else
{
byte l, h;
uint16_t res;
host_set_status_leds_READMEM();
host_set_addr_leds(addr);
l = MREAD(addr);
addr++;
host_set_addr_leds(addr);
h = MREAD(addr);
host_set_data_leds(h);
return l | (h * 256);
}
}
inline uint16_t MEM_WRITE_WORD(uint16_t addr, uint16_t v)
{
if( host_read_status_led_WAIT() )
{
MEM_WRITE_STEP(addr, v & 255);
addr++;
MEM_WRITE_STEP(addr, v / 256);
}
else
{
byte b;
host_set_status_leds_WRITEMEM();
host_set_addr_leds(addr);
b = v & 255;
MWRITE(addr, b);
addr++;
host_set_addr_leds(addr);
b = v / 256;
MWRITE(addr, b);
host_set_data_leds(b);
}
}
void pushStackSlow(byte valueH, byte valueL)
{
if( altair_isreset() )
{
host_set_status_led_STACK();
regSP--;
MEM_WRITE_STEP(regSP, valueH);
if( altair_isreset() )
{
regSP--;
MEM_WRITE_STEP(regSP, valueL);
}
host_clr_status_led_STACK();
}
}
void popStackSlow(byte *valueH, byte *valueL)
{
if( altair_isreset() )
{
host_set_status_led_STACK();
*valueL = MEM_READ_STEP(regSP);
if( altair_isreset() )
{
regSP++;
*valueH = MEM_READ_STEP(regSP);
if( altair_isreset() ) regSP++;
}
host_clr_status_led_STACK();
}
}
#define pushStack(valueH, valueL) \
if( !host_read_status_led_WAIT() ) \
{ \
host_set_status_led_STACK(); \
host_set_status_leds_WRITEMEM(); \
regSP--; \
host_set_addr_leds(regSP); \
MWRITE(regSP, valueH); \
regSP--; \
host_set_addr_leds(regSP); \
MWRITE(regSP, valueL); \
host_clr_status_led_STACK(); \
} \
else pushStackSlow(valueH, valueL);
#define popStack(valueH, valueL) \
if( !host_read_status_led_WAIT() ) \
{ \
host_set_status_leds_READMEM_STACK(); \
host_set_addr_leds(regSP); \
valueL = MREAD(regSP); \
regSP++; \
host_set_addr_leds(regSP); \
valueH = host_set_data_leds(MREAD(regSP)); \
regSP++; \
host_clr_status_led_STACK(); \
} \
else popStackSlow(&valueH, &valueL);
inline void pushStackWord(uint16_t v)
{
host_set_status_led_STACK();
regSP -= 2;
MEM_WRITE_WORD(regSP, v);
host_clr_status_led_STACK();
}
inline uint16_t popStackWord()
{
uint16_t v;
host_set_status_led_STACK();
v = MEM_READ_WORD(regSP);
regSP += 2;
host_clr_status_led_STACK();
return v;
}
#define pushPC() pushStack(regPCU.H, regPCU.L) //pushStackWord(regPC)
#define popPC() regPC = popStackWord()
#define CPU_ADC(REG) \
void cpu_ADC ## REG () \
{ \
uint16_t w = regA + reg ## REG; \
if(regS & PS_CARRY) w++; \
setHalfCarryBitAdd(regA, reg ## REG, w); \
setCarryBit(w&0x100); \
setStatusBits(w); \
regA = w; \
TIMER_ADD_CYCLES(4); \
}
CPU_ADC(B);
CPU_ADC(C);
CPU_ADC(D);
CPU_ADC(E);
CPU_ADC(H);
CPU_ADC(L);
CPU_ADC(A);
#define CPU_ADD(REG) \
void cpu_ADD ## REG () \
{ \
uint16_t w = regA + reg ## REG; \
setCarryBit(w&0x100); \
setHalfCarryBitAdd(regA, reg ## REG, w); \
setStatusBits(w); \
regA = w; \
TIMER_ADD_CYCLES(4); \
}
CPU_ADD(B);
CPU_ADD(C);
CPU_ADD(D);
CPU_ADD(E);
CPU_ADD(H);
CPU_ADD(L);
CPU_ADD(A);
#define CPU_SBB(REG) \
void cpu_SBB ## REG () \
{ \
uint16_t w = regA - reg ## REG; \
if(regS & PS_CARRY) w--; \
setHalfCarryBitSub(regA, reg ## REG, w); \
setCarryBit(w&0x100); \
setStatusBits(w); \
regA = w; \
TIMER_ADD_CYCLES(4); \
}
CPU_SBB(B);
CPU_SBB(C);
CPU_SBB(D);
CPU_SBB(E);
CPU_SBB(H);
CPU_SBB(L);
CPU_SBB(A);
#define CPU_SUB(REG) \
void cpu_SUB ## REG () \
{ \
uint16_t w = regA - reg ## REG; \
setCarryBit(w&0x100); \
setHalfCarryBitSub(regA, reg ## REG, w); \
setStatusBits(w); \
regA = w; \
TIMER_ADD_CYCLES(4); \
}
CPU_SUB(B);
CPU_SUB(C);
CPU_SUB(D);
CPU_SUB(E);
CPU_SUB(H);
CPU_SUB(L);
CPU_SUB(A);
#define CPU_ANA(REG) \
void cpu_ANA ## REG () \
{ \
setHalfCarryBit(regA&0x08 | reg ## REG & 0x08); \
regA &= reg ## REG; \
setCarryBit(0); \
setStatusBits(regA); \
TIMER_ADD_CYCLES(4); \
}
CPU_ANA(B);
CPU_ANA(C);
CPU_ANA(D);
CPU_ANA(E);
CPU_ANA(H);
CPU_ANA(L);
CPU_ANA(A);
#define CPU_XRA(REG) \
void cpu_XRA ## REG () \
{ \
regA ^= reg ## REG; \
setCarryBit(0); \
setHalfCarryBit(0); \
setStatusBits(regA); \
TIMER_ADD_CYCLES(4); \
}
CPU_XRA(B);
CPU_XRA(C);
CPU_XRA(D);
CPU_XRA(E);
CPU_XRA(H);
CPU_XRA(L);
CPU_XRA(A);
#define CPU_ORA(REG) \
void cpu_ORA ## REG () \
{ \
regA |= reg ## REG; \
setCarryBit(0); \
setHalfCarryBit(0); \
setStatusBits(regA); \
TIMER_ADD_CYCLES(4); \
}
CPU_ORA(B);
CPU_ORA(C);
CPU_ORA(D);
CPU_ORA(E);
CPU_ORA(H);
CPU_ORA(L);
CPU_ORA(A);
void cpu_ADCM()
{
byte opd2 = MEM_READ(regHL.HL);
uint16_t w = regA + opd2;
if(regS & PS_CARRY) w++;
setHalfCarryBitAdd(regA, opd2, w);
setCarryBit(w&0x100);
setStatusBits(w);
regA = w;
TIMER_ADD_CYCLES(7);
}
void cpu_ADDM()
{
byte opd2 = MEM_READ(regHL.HL);
uint16_t w = regA + opd2;
setCarryBit(w&0x100);
setHalfCarryBitAdd(regA, opd2, w);
setStatusBits(w);
regA = w;
TIMER_ADD_CYCLES(7);
}
void cpu_SBBM()
{
byte opd2 = MEM_READ(regHL.HL);
uint16_t w = regA - opd2;
if(regS & PS_CARRY) w--;
setHalfCarryBitSub(regA, opd2, w);
setCarryBit(w&0x100);
setStatusBits(w);
regA = w;
TIMER_ADD_CYCLES(7);
}
void cpu_SUBM()
{
byte opd2 = MEM_READ(regHL.HL);
uint16_t w = regA - opd2;
setCarryBit(w&0x100);
setHalfCarryBitSub(regA, opd2, w);
setStatusBits(w);
regA = w;
TIMER_ADD_CYCLES(7);
}
void cpu_ANAM()
{
byte opd2 = MEM_READ(regHL.HL);
setHalfCarryBit(regA&0x08 | opd2&0x08);
regA &= opd2;
setCarryBit(0);
setStatusBits(regA);
TIMER_ADD_CYCLES(7);
}
void cpu_XRAM()
{
regA ^= MEM_READ(regHL.HL);
setCarryBit(0);
setHalfCarryBit(0);
setStatusBits(regA);
TIMER_ADD_CYCLES(7);
}
void cpu_ORAM()
{
regA |= MEM_READ(regHL.HL);
setCarryBit(0);
setHalfCarryBit(0);
setStatusBits(regA);
TIMER_ADD_CYCLES(7);
}
void cpu_CALL()
{
regPC += 2;
pushPC();
regPC = MEM_READ_WORD(regPC-2);
TIMER_ADD_CYCLES(17);
}
#define CPU_CMP(REG) \
void cpu_CMP ## REG () \
{ \
uint16_t w = regA - reg ## REG; \
setCarryBit(w&0x100); \
setHalfCarryBitSub(regA, reg ## REG, w); \
setStatusBits(w); \
TIMER_ADD_CYCLES(4); \
}
CPU_CMP(B);
CPU_CMP(C);
CPU_CMP(D);
CPU_CMP(E);
CPU_CMP(H);
CPU_CMP(L);
CPU_CMP(A);
void cpu_CMPM()
{
byte opd2 = MEM_READ(regHL.HL);
uint16_t w = regA - opd2;
setCarryBit(w&0x100);
setHalfCarryBitSub(regA, opd2, w);
setStatusBits(w);
TIMER_ADD_CYCLES(7);
}
#define CPU_DCR(REG) \
void cpu_DCR ## REG () \
{ \
byte res = reg ## REG - 1; \
setHalfCarryBit((res & 0x0f)!=0x0f); \
setStatusBits(res); \
reg ## REG = res; \
TIMER_ADD_CYCLES(4); \
}
CPU_DCR(B);
CPU_DCR(C);
CPU_DCR(D);
CPU_DCR(E);
CPU_DCR(H);
CPU_DCR(L);
CPU_DCR(A);
void cpu_DCRM()
{
byte res = MEM_READ(regHL.HL) - 1;
setHalfCarryBit((res & 0x0f)!=0x0f);
setStatusBits(res);
MEM_WRITE(regHL.HL, res);
TIMER_ADD_CYCLES(7);
}
void cpu_ADI()
{
byte opd2 = MEM_READ(regPC);
uint16_t w = regA + opd2;
setCarryBit(w & 0x100);
setHalfCarryBitAdd(regA, opd2, w);
setStatusBits(w);
regA = w;
regPC++;
TIMER_ADD_CYCLES(7);
}
void cpu_ACI()
{
byte opd2 = MEM_READ(regPC);
uint16_t w = regA + opd2;
if(regS & PS_CARRY) w++;
setHalfCarryBitAdd(regA, opd2, w);
setCarryBit(w&0x100);
setStatusBits(w);
regA = w;
regPC++;
TIMER_ADD_CYCLES(7);
}
void cpu_SUI()
{
byte opd2 = MEM_READ(regPC);
uint16_t w = regA - opd2;
setCarryBit(w&0x100);
setHalfCarryBitSub(regA, opd2, w);
setStatusBits(w);
regA = w;
regPC++;
TIMER_ADD_CYCLES(7);
}
void cpu_SBI()
{
byte opd2 = MEM_READ(regPC);
uint16_t w = regA - opd2;
if(regS & PS_CARRY) w--;
setHalfCarryBitSub(regA, opd2, w);
setCarryBit(w&0x100);
setStatusBits(w);
regA = w;
regPC++;
TIMER_ADD_CYCLES(7);
}
void cpu_ANI()
{
byte opd2 = MEM_READ(regPC);
setHalfCarryBit(regA&0x08 | opd2&0x08);
regA &= opd2;
setCarryBit(0);
setStatusBits(regA);
regPC++;
TIMER_ADD_CYCLES(7);
}
void cpu_XRI()
{
regA ^= MEM_READ(regPC);
setCarryBit(0);
setHalfCarryBit(0);
setStatusBits(regA);
regPC++;
TIMER_ADD_CYCLES(7);
}
void cpu_ORI()
{
regA |= MEM_READ(regPC);
setCarryBit(0);
setHalfCarryBit(0);
setStatusBits(regA);
regPC++;
TIMER_ADD_CYCLES(7);
}
void cpu_CPI()
{
byte opd2 = MEM_READ(regPC);
uint16_t w = regA - opd2;
setCarryBit(w&0x100);
setHalfCarryBitSub(regA, opd2, w);
setStatusBits(w);
regPC++;
TIMER_ADD_CYCLES(7);
}
void cpu_CMA()
{
regA = ~regA;
TIMER_ADD_CYCLES(4);
}
void cpu_CMC()
{
regS ^= PS_CARRY;
TIMER_ADD_CYCLES(4);
}
void cpu_DAA()
{
byte b = regA;
byte adj = 0;
if( (regS & PS_HALFCARRY) || (b & 0x0f) > 0x09 ) adj = 0x06;
if( (regS & PS_CARRY) || (b & 0xf0) > 0x90 || ((b & 0xf0) == 0x90 && (b & 0x0f) > 9) )
{ adj |= 0x60; regS |= PS_CARRY; }
regA = b + adj;
setHalfCarryBitAdd(b, adj, regA);
setStatusBits(regA);
TIMER_ADD_CYCLES(4);
}
#define CPU_DAD(REG) \
void cpu_DAD ## REG() \
{ \
uint16_t w = reg##REG.REG; \
regHL.HL += w; \
setCarryBit(regHL.HL < w); \
TIMER_ADD_CYCLES(10); \
}
CPU_DAD(BC);
CPU_DAD(DE);
CPU_DAD(HL);
void cpu_DADS()
{
regHL.HL += regSP;
setCarryBit(regHL.HL < regSP);
TIMER_ADD_CYCLES(10);
}
#define CPU_DCX(REG) \
void cpu_DCX ## REG () \
{ \
reg##REG.REG--; \
TIMER_ADD_CYCLES(5); \
}
CPU_DCX(BC);
CPU_DCX(DE);
CPU_DCX(HL);
void cpu_DCXSP()
{
regSP--;
TIMER_ADD_CYCLES(5);
}
void cpu_DI()
{
altair_interrupt_disable();
TIMER_ADD_CYCLES(4);
}
void cpu_EI()
{
altair_interrupt_enable();
TIMER_ADD_CYCLES(4);
}
void cpu_HLT()
{
altair_hlt();
TIMER_ADD_CYCLES(7);
}
#define CPU_INR(REG) \
void cpu_INR ## REG() \
{ \
byte res = reg ## REG + 1; \
setHalfCarryBit((res&0x0f)==0); \
setStatusBits(res); \
reg ## REG = res; \
TIMER_ADD_CYCLES(5); \
}
CPU_INR(B);
CPU_INR(C);
CPU_INR(D);
CPU_INR(E);
CPU_INR(H);
CPU_INR(L);
CPU_INR(A);
void cpu_INRM()
{
byte res = MEM_READ(regHL.HL) + 1;
setHalfCarryBit((res&0x0f)==0);
setStatusBits(res);
MEM_WRITE(regHL.HL, res);
TIMER_ADD_CYCLES(10);
}
#define CPU_INX(REG) \
void cpu_INX ## REG () \
{ \
reg##REG.REG++; \
TIMER_ADD_CYCLES(5); \
}
CPU_INX(BC);
CPU_INX(DE);
CPU_INX(HL);
void cpu_INXSP()
{
regSP++;
TIMER_ADD_CYCLES(5);
}
void cpu_LDA()
{
uint16_t addr = MEM_READ_WORD(regPC);
regA = MEM_READ(addr);
regPC += 2;
TIMER_ADD_CYCLES(13);
}
#define CPU_LDX(REG) \
void cpu_LDX ## REG() \
{ \
regA = MEM_READ(reg##REG.REG); \
TIMER_ADD_CYCLES(7); \
}
CPU_LDX(BC);
CPU_LDX(DE);
void cpu_LHLD()
{
uint16_t addr = MEM_READ_WORD(regPC);
regL = MEM_READ(addr);
regH = MEM_READ(addr+1);
regPC += 2;
TIMER_ADD_CYCLES(16);
}
void cpu_LXIS()
{
regSP = MEM_READ_WORD(regPC);
regPC += 2;
TIMER_ADD_CYCLES(10);
}
#define CPU_LXI(REGH,REGL) \
void cpu_LXI ## REGH ## REGL() \
{ \
reg ## REGL = MEM_READ(regPC); \
reg ## REGH = MEM_READ(regPC+1); \
regPC += 2; \
TIMER_ADD_CYCLES(10); \
}
CPU_LXI(B,C);
CPU_LXI(D,E);
CPU_LXI(H,L);
#define CPU_MVRR(REGTO,REGFROM) \
void cpu_MV ## REGTO ## REGFROM () \
{ \
reg ## REGTO = reg ## REGFROM; \
TIMER_ADD_CYCLES(5); \
}
#define CPU_MVMR(REGFROM) \
void cpu_MVM ## REGFROM() \
{ \
MEM_WRITE(regHL.HL, reg ## REGFROM); \
TIMER_ADD_CYCLES(7); \
}
#define CPU_MVRM(REGTO) \
void cpu_MV ## REGTO ## M() \
{ \
reg ## REGTO = MEM_READ(regHL.HL); \
TIMER_ADD_CYCLES(7); \
}
#define CPU_MVRI(REGTO) \
void cpu_MV ## REGTO ## I() \
{ \
reg ## REGTO = MEM_READ(regPC); \
regPC++; \
TIMER_ADD_CYCLES(7); \
}
CPU_MVRR(B, B);
CPU_MVRR(B, C);
CPU_MVRR(B, D);
CPU_MVRR(B, E);
CPU_MVRR(B, H);
CPU_MVRR(B, L);
CPU_MVRR(B, A);
CPU_MVRM(B);
CPU_MVMR(B);
CPU_MVRI(B);
CPU_MVRR(C, B);
CPU_MVRR(C, C);
CPU_MVRR(C, D);
CPU_MVRR(C, E);
CPU_MVRR(C, H);
CPU_MVRR(C, L);
CPU_MVRR(C, A);
CPU_MVRM(C);
CPU_MVMR(C);
CPU_MVRI(C);
CPU_MVRR(D, B);
CPU_MVRR(D, C);
CPU_MVRR(D, D);
CPU_MVRR(D, E);
CPU_MVRR(D, H);
CPU_MVRR(D, L);
CPU_MVRR(D, A);
CPU_MVRM(D);
CPU_MVMR(D);
CPU_MVRI(D);
CPU_MVRR(E, B);
CPU_MVRR(E, C);
CPU_MVRR(E, D);
CPU_MVRR(E, E);
CPU_MVRR(E, H);
CPU_MVRR(E, L);
CPU_MVRR(E, A);
CPU_MVRM(E);
CPU_MVMR(E);
CPU_MVRI(E);
CPU_MVRR(H, B);
CPU_MVRR(H, C);
CPU_MVRR(H, D);
CPU_MVRR(H, E);
CPU_MVRR(H, H);
CPU_MVRR(H, L);
CPU_MVRR(H, A);
CPU_MVRM(H);
CPU_MVMR(H);
CPU_MVRI(H);
CPU_MVRR(L, B);
CPU_MVRR(L, C);
CPU_MVRR(L, D);
CPU_MVRR(L, E);
CPU_MVRR(L, H);
CPU_MVRR(L, L);
CPU_MVRR(L, A);
CPU_MVRM(L);
CPU_MVMR(L);
CPU_MVRI(L);
CPU_MVRR(A, B);
CPU_MVRR(A, C);
CPU_MVRR(A, D);
CPU_MVRR(A, E);
CPU_MVRR(A, H);
CPU_MVRR(A, L);
CPU_MVRR(A, A);
CPU_MVRM(A);
CPU_MVMR(A);
CPU_MVRI(A);
void cpu_MVMI()
{
// MVI dst, M
MEM_WRITE(regHL.HL, MEM_READ(regPC));
regPC++;
TIMER_ADD_CYCLES(10);
}
void cpu_NOP()
{
TIMER_ADD_CYCLES(4);
}
void cpu_PCHL()
{
regPC = regHL.HL;
TIMER_ADD_CYCLES(5);
}
#define CPU_POP(REGH, REGL) \
void cpu_POP ## REGH ## REGL() \
{ \
popStack(reg ## REGH, reg ## REGL); \
TIMER_ADD_CYCLES(10); \
}
CPU_POP(B, C);
CPU_POP(D, E);
CPU_POP(H, L);
CPU_POP(A, S);
#define CPU_PSH(REGH, REGL) \
void cpu_PSH ## REGH ## REGL() \
{ \
pushStack(reg ## REGH, reg ## REGL); \
TIMER_ADD_CYCLES(11); \
}
CPU_PSH(B, C);
CPU_PSH(D, E);
CPU_PSH(H, L);
void cpu_PSHAS()
{
pushStack(regA, (regS & 0xD5) | 0x02);
TIMER_ADD_CYCLES(11);
}
void cpu_RLC()
{
byte b = regA & 128;
regA = (regA * 2) | (b ? 1 : 0) ;
setCarryBit(b);
TIMER_ADD_CYCLES(4);
}
void cpu_RRC()
{
byte b = regA & 1;
regA = (regA / 2) | (b ? 128 : 0) ;
setCarryBit(b);
TIMER_ADD_CYCLES(4);
}
void cpu_RAL()
{
byte b = regA & 128;
regA = (regA * 2) | ((regS & PS_CARRY) ? 1 : 0) ;
setCarryBit(b);
TIMER_ADD_CYCLES(4);
}
void cpu_RAR()
{
byte b = regA & 1;
regA = (regA / 2) | ((regS & PS_CARRY) ? 128 : 0) ;
setCarryBit(b);
TIMER_ADD_CYCLES(4);
}
void cpu_RET()
{
popPC();
TIMER_ADD_CYCLES(10);
}
#define CPU_RST(N) \
void cpu_RST ## N() \
{ \
pushPC(); \
regPC = 0x00 ## N; \
TIMER_ADD_CYCLES(4); \
}
CPU_RST(00);
CPU_RST(08);
CPU_RST(10);
CPU_RST(18);
CPU_RST(20);
CPU_RST(28);
CPU_RST(30);
CPU_RST(38);
void cpu_RNZ()
{
if( !(regS & PS_ZERO) )
{ popPC(); TIMER_ADD_CYCLES(11); }
else
TIMER_ADD_CYCLES(5);
}
void cpu_RZ()
{
if( (regS & PS_ZERO) )
{ popPC(); TIMER_ADD_CYCLES(11); }
else
TIMER_ADD_CYCLES(5);
}
void cpu_RNC()
{
if( !(regS & PS_CARRY) )
{ popPC(); TIMER_ADD_CYCLES(11); }
else
TIMER_ADD_CYCLES(5);
}
void cpu_RC()
{
if( (regS & PS_CARRY) )
{ popPC(); TIMER_ADD_CYCLES(11); }
else
TIMER_ADD_CYCLES(5);
}
void cpu_RPO()
{
if( !(regS & PS_PARITY) )
{ popPC(); TIMER_ADD_CYCLES(11); }
else
TIMER_ADD_CYCLES(5);
}
void cpu_RPE()
{
if( (regS & PS_PARITY) )
{ popPC(); TIMER_ADD_CYCLES(11); }
else
TIMER_ADD_CYCLES(5);
}
void cpu_RP()
{
if( !(regS & PS_SIGN) )
{ popPC(); TIMER_ADD_CYCLES(11); }
else
TIMER_ADD_CYCLES(5);
}