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- /** M6502: portable 6502 emulator ****************************/
- /** **/
- /** Codes.h **/
- /** **/
- /** This file contains implementation for the main table of **/
- /** 6502 commands. It is included from 6502.c. **/
- /** **/
- /** Copyright (C) Marat Fayzullin 1996-2002 **/
- /** Alex Krasivsky 1996 **/
- /** You are not allowed to distribute this software **/
- /** commercially. Please, notify me, if you make any **/
- /** changes to this file. **/
- /*************************************************************/
- /*
- * $LastChangedDate$
- * $Author$
- * $HeadURL$
- * $Revision$
- */
-
- case 0x10:
- if (R->P & N_FLAG)
- R->PC.W++;
- else
- {
- M_JR;
- } break; /* BPL * REL */
- case 0x30:
- if (R->P & N_FLAG)
- {
- M_JR;
- }
- else
- R->PC.W++;
- break; /* BMI * REL */
- case 0xD0:
- if (R->P & Z_FLAG)
- R->PC.W++;
- else
- {
- M_JR;
- } break; /* BNE * REL */
- case 0xF0:
- if (R->P & Z_FLAG)
- {
- M_JR;
- }
- else
- R->PC.W++;
- break; /* BEQ * REL */
- case 0x90:
- if (R->P & C_FLAG)
- R->PC.W++;
- else
- {
- M_JR;
- } break; /* BCC * REL */
- case 0xB0:
- if (R->P & C_FLAG)
- {
- M_JR;
- }
- else
- R->PC.W++;
- break; /* BCS * REL */
- case 0x50:
- if (R->P & V_FLAG)
- R->PC.W++;
- else
- {
- M_JR;
- } break; /* BVC * REL */
- case 0x70:
- if (R->P & V_FLAG)
- {
- M_JR;
- }
- else
- R->PC.W++;
- break; /* BVS * REL */
- /* RTI */
- case 0x40:
- M_POP(R->P);
- //R->P |= R_FLAG;
- M_POP(R->PC.B.l);
- M_POP(R->PC.B.h);
- break;
- /* RTS */
- case 0x60:
- M_POP(R->PC.B.l);
- M_POP(R->PC.B.h);
- R->PC.W++;
- break;
- /* JSR $ssss ABS */
- case 0x20:
- K.B.l = Op6502(R->PC.W++);
- K.B.h = Op6502(R->PC.W);
- M_PUSH(R->PC.B.h);
- M_PUSH(R->PC.B.l);
- R->PC = K;
- break;
- /* JMP $ssss ABS */
- case 0x4C:
- M_LDWORD(K);
- R->PC = K;
- break;
- /* JMP ($ssss) ABDINDIR */
- case 0x6C:
- M_LDWORD(K);
- R->PC.B.l = Rd6502(K.W);
- K.B.l++;
- R->PC.B.h = Rd6502(K.W);
- break;
- /* BRK */
- case 0x00:
- R->PC.W++;
- M_PUSH(R->PC.B.h);
- M_PUSH(R->PC.B.l);
- M_PUSH(R->P | B_FLAG);
- R->P = (R->P | I_FLAG) & ~D_FLAG;
- R->PC.B.l = Rd6502(0xFFFE);
- R->PC.B.h = Rd6502(0xFFFF);
- break;
- /* CLI */
- case 0x58:
- if ((R->IRequest != INT_NONE) && (R->P & I_FLAG))
-
- {
-
- R->AfterCLI = 1;
-
- R->IBackup = R->ICount;
-
- R->ICount = 1;
-
- }
- R->P &= ~I_FLAG;
- break;
- /* PLP */
- case 0x28:
- M_POP(I);
- if ((R->IRequest != INT_NONE) && ((I ^ R->P) & ~I & I_FLAG))
-
- {
-
- R->AfterCLI = 1;
-
- R->IBackup = R->ICount;
-
- R->ICount = 1;
-
- }
- R->P = I /*| R_FLAG*/ | B_FLAG;
- break;
- case 0x08:
- M_PUSH(R->P);
- break; /* PHP */
- case 0x18:
- R->P &= ~C_FLAG;
- break; /* CLC */
- case 0xB8:
- R->P &= ~V_FLAG;
- break; /* CLV */
- case 0xD8:
- R->P &= ~D_FLAG;
- break; /* CLD */
- case 0x38:
- R->P |= C_FLAG;
- break; /* SEC */
- case 0xF8:
- R->P |= D_FLAG;
- break; /* SED */
- case 0x78:
- R->P |= I_FLAG;
- break; /* SEI */
- case 0x48:
- M_PUSH(R->A);
- break; /* PHA */
- case 0x68:
- M_POP(R->A);
- M_FL(R->A);
- break; /* PLA */
- case 0x98:
- R->A = R->Y;
- M_FL(R->A);
- break; /* TYA */
- case 0xA8:
- R->Y = R->A;
- M_FL(R->Y);
- break; /* TAY */
- case 0xC8:
- R->Y++;
- M_FL(R->Y);
- break; /* INY */
- case 0x88:
- R->Y--;
- M_FL(R->Y);
- break; /* DEY */
- case 0x8A:
- R->A = R->X;
- M_FL(R->A);
- break; /* TXA */
- case 0xAA:
- R->X = R->A;
- M_FL(R->X);
- break; /* TAX */
- case 0xE8:
- R->X++;
- M_FL(R->X);
- break; /* INX */
- case 0xCA:
- R->X--;
- M_FL(R->X);
- break; /* DEX */
- default: /* In CMOS version unrecognized instructions are concidered as
- NOP */
- case 0xEA:
- break; /* NOP */
- case 0x9A:
- R->S = R->X;
- break; /* TXS */
- case 0xBA:
- R->X = R->S;
- M_FL(R->X);
- break; /* TSX */
- case 0x24:
- MR_Zp(I);
- M_BIT(I);
- break; /* BIT $ss ZP */
- case 0x2C:
- MR_Ab(I);
- M_BIT(I);
- break; /* BIT $ssss ABS */
- case 0x05:
- MR_Zp(I);
- M_ORA(I);
- break; /* ORA $ss ZP */
- case 0x06:
- MM_Zp(M_ASL);
- break; /* ASL $ss ZP */
- case 0x25:
- MR_Zp(I);
- M_AND(I);
- break; /* AND $ss ZP */
- case 0x26:
- MM_Zp(M_ROL);
- break; /* ROL $ss ZP */
- case 0x45:
- MR_Zp(I);
- M_EOR(I);
- break; /* EOR $ss ZP */
- case 0x46:
- MM_Zp(M_LSR);
- break; /* LSR $ss ZP */
- case 0x65:
- MR_Zp(I);
- M_ADC(I);
- break; /* ADC $ss ZP */
- case 0x66:
- MM_Zp(M_ROR);
- break; /* ROR $ss ZP */
- case 0x84:
- MW_Zp(R->Y);
- break; /* STY $ss ZP */
- case 0x85:
- MW_Zp(R->A);
- break; /* STA $ss ZP */
- case 0x86:
- MW_Zp(R->X);
- break; /* STX $ss ZP */
- case 0xA4:
- MR_Zp(R->Y);
- M_FL(R->Y);
- break; /* LDY $ss ZP */
- case 0xA5:
- MR_Zp(R->A);
- M_FL(R->A);
- break; /* LDA $ss ZP */
- case 0xA6:
- MR_Zp(R->X);
- M_FL(R->X);
- break; /* LDX $ss ZP */
- case 0xC4:
- MR_Zp(I);
- M_CMP(R->Y, I);
- break; /* CPY $ss ZP */
- case 0xC5:
- MR_Zp(I);
- M_CMP(R->A, I);
- break; /* CMP $ss ZP */
- case 0xC6:
- MM_Zp(M_DEC);
- break; /* DEC $ss ZP */
- case 0xE4:
- MR_Zp(I);
- M_CMP(R->X, I);
- break; /* CPX $ss ZP */
- case 0xE5:
- MR_Zp(I);
- M_SBC(I);
- break; /* SBC $ss ZP */
- case 0xE6:
- MM_Zp(M_INC);
- break; /* INC $ss ZP */
- case 0x0D:
- MR_Ab(I);
- M_ORA(I);
- break; /* ORA $ssss ABS */
- case 0x0E:
- MM_Ab(M_ASL);
- break; /* ASL $ssss ABS */
- case 0x2D:
- MR_Ab(I);
- M_AND(I);
- break; /* AND $ssss ABS */
- case 0x2E:
- MM_Ab(M_ROL);
- break; /* ROL $ssss ABS */
- case 0x4D:
- MR_Ab(I);
- M_EOR(I);
- break; /* EOR $ssss ABS */
- case 0x4E:
- MM_Ab(M_LSR);
- break; /* LSR $ssss ABS */
- case 0x6D:
- MR_Ab(I);
- M_ADC(I);
- break; /* ADC $ssss ABS */
- case 0x6E:
- MM_Ab(M_ROR);
- break; /* ROR $ssss ABS */
- case 0x8C:
- MW_Ab(R->Y);
- break; /* STY $ssss ABS */
- case 0x8D:
- MW_Ab(R->A);
- break; /* STA $ssss ABS */
- case 0x8E:
- MW_Ab(R->X);
- break; /* STX $ssss ABS */
- case 0xAC:
- MR_Ab(R->Y);
- M_FL(R->Y);
- break; /* LDY $ssss ABS */
- case 0xAD:
- MR_Ab(R->A);
- M_FL(R->A);
- break; /* LDA $ssss ABS */
- case 0xAE:
- MR_Ab(R->X);
- M_FL(R->X);
- break; /* LDX $ssss ABS */
- case 0xCC:
- MR_Ab(I);
- M_CMP(R->Y, I);
- break; /* CPY $ssss ABS */
- case 0xCD:
- MR_Ab(I);
- M_CMP(R->A, I);
- break; /* CMP $ssss ABS */
- case 0xCE:
- MM_Ab(M_DEC);
- break; /* DEC $ssss ABS */
- case 0xEC:
- MR_Ab(I);
- M_CMP(R->X, I);
- break; /* CPX $ssss ABS */
- case 0xED:
- MR_Ab(I);
- M_SBC(I);
- break; /* SBC $ssss ABS */
- case 0xEE:
- MM_Ab(M_INC);
- break; /* INC $ssss ABS */
- case 0x09:
- MR_Im(I);
- M_ORA(I);
- break; /* ORA #$ss IMM */
- case 0x29:
- MR_Im(I);
- M_AND(I);
- break; /* AND #$ss IMM */
- case 0x49:
- MR_Im(I);
- M_EOR(I);
- break; /* EOR #$ss IMM */
- case 0x69:
- MR_Im(I);
- M_ADC(I);
- break; /* ADC #$ss IMM */
- case 0xA0:
- MR_Im(R->Y);
- M_FL(R->Y);
- break; /* LDY #$ss IMM */
- case 0xA2:
- MR_Im(R->X);
- M_FL(R->X);
- break; /* LDX #$ss IMM */
- case 0xA9:
- MR_Im(R->A);
- M_FL(R->A);
- break; /* LDA #$ss IMM */
- case 0xC0:
- MR_Im(I);
- M_CMP(R->Y, I);
- break; /* CPY #$ss IMM */
- case 0xC9:
- MR_Im(I);
- M_CMP(R->A, I);
- break; /* CMP #$ss IMM */
- case 0xE0:
- MR_Im(I);
- M_CMP(R->X, I);
- break; /* CPX #$ss IMM */
- case 0xE9:
- MR_Im(I);
- M_SBC(I);
- break; /* SBC #$ss IMM */
- case 0x15:
- MR_Zx(I);
- M_ORA(I);
- break; /* ORA $ss,x ZP,x */
- case 0x16:
- MM_Zx(M_ASL);
- break; /* ASL $ss,x ZP,x */
- case 0x35:
- MR_Zx(I);
- M_AND(I);
- break; /* AND $ss,x ZP,x */
- case 0x36:
- MM_Zx(M_ROL);
- break; /* ROL $ss,x ZP,x */
- case 0x55:
- MR_Zx(I);
- M_EOR(I);
- break; /* EOR $ss,x ZP,x */
- case 0x56:
- MM_Zx(M_LSR);
- break; /* LSR $ss,x ZP,x */
- case 0x75:
- MR_Zx(I);
- M_ADC(I);
- break; /* ADC $ss,x ZP,x */
- case 0x76:
- MM_Zx(M_ROR);
- break; /* ROR $ss,x ZP,x */
- case 0x94:
- MW_Zx(R->Y);
- break; /* STY $ss,x ZP,x */
- case 0x95:
- MW_Zx(R->A);
- break; /* STA $ss,x ZP,x */
- case 0x96:
- MW_Zy(R->X);
- break; /* STX $ss,y ZP,y */
- case 0xB4:
- MR_Zx(R->Y);
- M_FL(R->Y);
- break; /* LDY $ss,x ZP,x */
- case 0xB5:
- MR_Zx(R->A);
- M_FL(R->A);
- break; /* LDA $ss,x ZP,x */
- case 0xB6:
- MR_Zy(R->X);
- M_FL(R->X);
- break; /* LDX $ss,y ZP,y */
- case 0xD5:
- MR_Zx(I);
- M_CMP(R->A, I);
- break; /* CMP $ss,x ZP,x */
- case 0xD6:
- MM_Zx(M_DEC);
- break; /* DEC $ss,x ZP,x */
- case 0xF5:
- MR_Zx(I);
- M_SBC(I);
- break; /* SBC $ss,x ZP,x */
- case 0xF6:
- MM_Zx(M_INC);
- break; /* INC $ss,x ZP,x */
- case 0x19:
- MR_Ay(I);
- M_ORA(I);
- break; /* ORA $ssss,y ABS,y */
- case 0x1D:
- MR_Ax(I);
- M_ORA(I);
- break; /* ORA $ssss,x ABS,x */
- case 0x1E:
- MM_Ax(M_ASL);
- break; /* ASL $ssss,x ABS,x */
- case 0x39:
- MR_Ay(I);
- M_AND(I);
- break; /* AND $ssss,y ABS,y */
- case 0x3D:
- MR_Ax(I);
- M_AND(I);
- break; /* AND $ssss,x ABS,x */
- case 0x3E:
- MM_Ax(M_ROL);
- break; /* ROL $ssss,x ABS,x */
- case 0x59:
- MR_Ay(I);
- M_EOR(I);
- break; /* EOR $ssss,y ABS,y */
- case 0x5D:
- MR_Ax(I);
- M_EOR(I);
- break; /* EOR $ssss,x ABS,x */
- case 0x5E:
- MM_Ax(M_LSR);
- break; /* LSR $ssss,x ABS,x */
- case 0x79:
- MR_Ay(I);
- M_ADC(I);
- break; /* ADC $ssss,y ABS,y */
- case 0x7D:
- MR_Ax(I);
- M_ADC(I);
- break; /* ADC $ssss,x ABS,x */
- case 0x7E:
- MM_Ax(M_ROR);
- break; /* ROR $ssss,x ABS,x */
- case 0x99:
- MW_Ay(R->A);
- break; /* STA $ssss,y ABS,y */
- case 0x9D:
- MW_Ax(R->A);
- break; /* STA $ssss,x ABS,x */
- case 0xB9:
- MR_Ay(R->A);
- M_FL(R->A);
- break; /* LDA $ssss,y ABS,y */
- case 0xBC:
- MR_Ax(R->Y);
- M_FL(R->Y);
- break; /* LDY $ssss,x ABS,x */
- case 0xBD:
- MR_Ax(R->A);
- M_FL(R->A);
- break; /* LDA $ssss,x ABS,x */
- case 0xBE:
- MR_Ay(R->X);
- M_FL(R->X);
- break; /* LDX $ssss,y ABS,y */
- case 0xD9:
- MR_Ay(I);
- M_CMP(R->A, I);
- break; /* CMP $ssss,y ABS,y */
- case 0xDD:
- MR_Ax(I);
- M_CMP(R->A, I);
- break; /* CMP $ssss,x ABS,x */
- case 0xDE:
- MM_Ax(M_DEC);
- break; /* DEC $ssss,x ABS,x */
- case 0xF9:
- MR_Ay(I);
- M_SBC(I);
- break; /* SBC $ssss,y ABS,y */
- case 0xFD:
- MR_Ax(I);
- M_SBC(I);
- break; /* SBC $ssss,x ABS,x */
- case 0xFE:
- MM_Ax(M_INC);
- break; /* INC $ssss,x ABS,x */
- case 0x01:
- MR_Ix(I);
- M_ORA(I);
- break; /* ORA ($ss,x) INDEXINDIR */
- case 0x11:
- MR_Iy(I);
- M_ORA(I);
- break; /* ORA ($ss),y INDIRINDEX */
- case 0x21:
- MR_Ix(I);
- M_AND(I);
- break; /* AND ($ss,x) INDEXINDIR */
- case 0x31:
- MR_Iy(I);
- M_AND(I);
- break; /* AND ($ss),y INDIRINDEX */
- case 0x41:
- MR_Ix(I);
- M_EOR(I);
- break; /* EOR ($ss,x) INDEXINDIR */
- case 0x51:
- MR_Iy(I);
- M_EOR(I);
- break; /* EOR ($ss),y INDIRINDEX */
- case 0x61:
- MR_Ix(I);
- M_ADC(I);
- break; /* ADC ($ss,x) INDEXINDIR */
- case 0x71:
- MR_Iy(I);
- M_ADC(I);
- break; /* ADC ($ss),y INDIRINDEX */
- case 0x81:
- MW_Ix(R->A);
- break; /* STA ($ss,x) INDEXINDIR */
- case 0x91:
- MW_Iy(R->A);
- break; /* STA ($ss),y INDIRINDEX */
- case 0xA1:
- MR_Ix(R->A);
- M_FL(R->A);
- break; /* LDA ($ss,x) INDEXINDIR */
- case 0xB1:
- MR_Iy(R->A);
- M_FL(R->A);
- break; /* LDA ($ss),y INDIRINDEX */
- case 0xC1:
- MR_Ix(I);
- M_CMP(R->A, I);
- break; /* CMP ($ss,x) INDEXINDIR */
- case 0xD1:
- MR_Iy(I);
- M_CMP(R->A, I);
- break; /* CMP ($ss),y INDIRINDEX */
- case 0xE1:
- MR_Ix(I);
- M_SBC(I);
- break; /* SBC ($ss,x) INDEXINDIR */
- case 0xF1:
- MR_Iy(I);
- M_SBC(I);
- break; /* SBC ($ss),y INDIRINDEX */
- case 0x0A:
- M_ASL(R->A);
- break; /* ASL a ACC */
- case 0x2A:
- M_ROL(R->A);
- break; /* ROL a ACC */
- case 0x4A:
- M_LSR(R->A);
- break; /* LSR a ACC */
- case 0x6A:
- M_ROR(R->A);
- break; /* ROR a ACC */
|