diff options
Diffstat (limited to 'src/emu/cpu/i4004/i4004.c')
-rw-r--r-- | src/emu/cpu/i4004/i4004.c | 138 |
1 files changed, 69 insertions, 69 deletions
diff --git a/src/emu/cpu/i4004/i4004.c b/src/emu/cpu/i4004/i4004.c index 8fd9a882aaf..af76a239b36 100644 --- a/src/emu/cpu/i4004/i4004.c +++ b/src/emu/cpu/i4004/i4004.c @@ -2,8 +2,8 @@ * * i4004.c * - * Intel 4004 CPU - * + * Intel 4004 CPU + * * Initial version by Miodrag Milanovic * *****************************************************************************/ @@ -57,7 +57,7 @@ static const cpu_state_entry state_array[] = { I4004_STATE_ENTRY(PC, "%03X", PC.w.l, 0x0fff, 0) I4004_STATE_ENTRY(GENPC,"%03X", PC.w.l, 0x0fff, CPUSTATE_NOSHOW) - I4004_STATE_ENTRY(A, "%01X", A, 0x0f, 0) + I4004_STATE_ENTRY(A, "%01X", A, 0x0f, 0) I4004_STATE_ENTRY(R01, "%02X", R[0], 0xff, 0) I4004_STATE_ENTRY(R23, "%02X", R[1], 0xff, 0) I4004_STATE_ENTRY(R45, "%02X", R[2], 0xff, 0) @@ -164,7 +164,7 @@ INLINE UINT8 GET_REG(i4004_state *cpustate, UINT8 num) { UINT8 r = cpustate->R[num>>1]; if (num & 1) { - return r & 0x0f; + return r & 0x0f; } else { return (r >> 4) & 0x0f; } @@ -187,7 +187,7 @@ INLINE void PUSH_STACK(i4004_state *cpustate) INLINE void POP_STACK(i4004_state *cpustate) { cpustate->ADDR[cpustate->pc_pos].d = 0; - cpustate->pc_pos = (cpustate->pc_pos - 1) & cpustate->addr_mask; + cpustate->pc_pos = (cpustate->pc_pos - 1) & cpustate->addr_mask; } void i4004_set_test(const device_config *device, UINT8 val) @@ -202,91 +202,91 @@ static void execute_one(i4004_state *cpustate, int opcode) switch (opcode) { case 0x00: /* NOP */ - /* no op */ + /* no op */ break; - case 0x10: case 0x11: case 0x12: case 0x13: - case 0x14: case 0x15: case 0x16: case 0x17: - case 0x18: case 0x19: case 0x1a: case 0x1b: + case 0x10: case 0x11: case 0x12: case 0x13: + case 0x14: case 0x15: case 0x16: case 0x17: + case 0x18: case 0x19: case 0x1a: case 0x1b: case 0x1c: case 0x1d: case 0x1e: case 0x1f: /* JCN */ { UINT8 arg = ARG(cpustate); - + UINT8 C1 = BIT(opcode,3); UINT8 C2 = BIT(opcode,2); UINT8 C3 = BIT(opcode,1); UINT8 C4 = BIT(opcode,0); UINT8 JUMP = (((cpustate->A == 0) ? 1 : 0) & C2) | ((cpustate->C) & C3) | ((cpustate->TEST ^ 1) & C4); cpustate->icount -= 8; - + if(((C1 ^ 1) & JUMP) | (C1 & (JUMP ^ 1))) { GET_PC.w.l = (GET_PC.w.l & 0x0f00) | arg; cpustate->PC = GET_PC; } } break; - case 0x20: case 0x22: case 0x24: case 0x26: + case 0x20: case 0x22: case 0x24: case 0x26: case 0x28: case 0x2a: case 0x2c: case 0x2e: /* FIM */ cpustate->icount -= 8; cpustate->R[(opcode & 0x0f)>>1] = ROP(cpustate); break; - case 0x21: case 0x23: case 0x25: case 0x27: + case 0x21: case 0x23: case 0x25: case 0x27: case 0x29: case 0x2b: case 0x2d: case 0x2f: /* SRC */ - cpustate->RAM.b.l = cpustate->R[(opcode & 0x0f)>>1]; + cpustate->RAM.b.l = cpustate->R[(opcode & 0x0f)>>1]; break; - case 0x30: case 0x32: case 0x34: case 0x36: + case 0x30: case 0x32: case 0x34: case 0x36: case 0x38: case 0x3a: case 0x3c: case 0x3e: /* FIN */ cpustate->icount -= 8; cpustate->R[(opcode & 0x0f)>>1] = READ_ROM(cpustate); break; - case 0x31: case 0x33: case 0x35: case 0x37: + case 0x31: case 0x33: case 0x35: case 0x37: case 0x39: case 0x3b: case 0x3d: case 0x3f: /* JIN */ GET_PC.w.l = (GET_PC.w.l & 0x0f00) | cpustate->R[(opcode & 0x0f)>>1]; cpustate->PC = GET_PC; break; - case 0x40: case 0x41: case 0x42: case 0x43: - case 0x44: case 0x45: case 0x46: case 0x47: - case 0x48: case 0x49: case 0x4a: case 0x4b: + case 0x40: case 0x41: case 0x42: case 0x43: + case 0x44: case 0x45: case 0x46: case 0x47: + case 0x48: case 0x49: case 0x4a: case 0x4b: case 0x4c: case 0x4d: case 0x4e: case 0x4f: /* JUN */ cpustate->icount -= 8; GET_PC.w.l = ((opcode & 0x0f) << 8) | ARG(cpustate); cpustate->PC = GET_PC; break; - case 0x50: case 0x51: case 0x52: case 0x53: - case 0x54: case 0x55: case 0x56: case 0x57: - case 0x58: case 0x59: case 0x5a: case 0x5b: + case 0x50: case 0x51: case 0x52: case 0x53: + case 0x54: case 0x55: case 0x56: case 0x57: + case 0x58: case 0x59: case 0x5a: case 0x5b: case 0x5c: case 0x5d: case 0x5e: case 0x5f: /* JMS */ { UINT16 newPC = ((opcode & 0x0f) << 8) | ARG(cpustate); - cpustate->icount -= 8; + cpustate->icount -= 8; PUSH_STACK(cpustate); GET_PC.w.l = newPC; cpustate->PC = GET_PC; } break; - case 0x60: case 0x61: case 0x62: case 0x63: - case 0x64: case 0x65: case 0x66: case 0x67: - case 0x68: case 0x69: case 0x6a: case 0x6b: + case 0x60: case 0x61: case 0x62: case 0x63: + case 0x64: case 0x65: case 0x66: case 0x67: + case 0x68: case 0x69: case 0x6a: case 0x6b: case 0x6c: case 0x6d: case 0x6e: case 0x6f: /* INC */ SET_REG(cpustate, opcode & 0x0f, GET_REG(cpustate, opcode & 0x0f) + 1); break; - case 0x70: case 0x71: case 0x72: case 0x73: - case 0x74: case 0x75: case 0x76: case 0x77: - case 0x78: case 0x79: case 0x7a: case 0x7b: + case 0x70: case 0x71: case 0x72: case 0x73: + case 0x74: case 0x75: case 0x76: case 0x77: + case 0x78: case 0x79: case 0x7a: case 0x7b: case 0x7c: case 0x7d: case 0x7e: case 0x7f: /* ISZ */ - { + { UINT8 val = (GET_REG(cpustate, opcode & 0x0f) + 1) & 0xf; UINT16 addr = ARG(cpustate); cpustate->icount -= 8; - SET_REG(cpustate, opcode & 0x0f, val); + SET_REG(cpustate, opcode & 0x0f, val); if (val!=0) { - GET_PC.w.l = (GET_PC.w.l & 0x0f00) | addr; - } - cpustate->PC = GET_PC; + GET_PC.w.l = (GET_PC.w.l & 0x0f00) | addr; + } + cpustate->PC = GET_PC; } break; - case 0x80: case 0x81: case 0x82: case 0x83: - case 0x84: case 0x85: case 0x86: case 0x87: - case 0x88: case 0x89: case 0x8a: case 0x8b: + case 0x80: case 0x81: case 0x82: case 0x83: + case 0x84: case 0x85: case 0x86: case 0x87: + case 0x88: case 0x89: case 0x8a: case 0x8b: case 0x8c: case 0x8d: case 0x8e: case 0x8f: /* ADD */ { UINT8 acc = cpustate->A + GET_REG(cpustate, opcode & 0x0f) + cpustate->C; @@ -294,47 +294,47 @@ static void execute_one(i4004_state *cpustate, int opcode) cpustate->C = (acc >> 4) & 1; } break; - case 0x90: case 0x91: case 0x92: case 0x93: - case 0x94: case 0x95: case 0x96: case 0x97: - case 0x98: case 0x99: case 0x9a: case 0x9b: + case 0x90: case 0x91: case 0x92: case 0x93: + case 0x94: case 0x95: case 0x96: case 0x97: + case 0x98: case 0x99: case 0x9a: case 0x9b: case 0x9c: case 0x9d: case 0x9e: case 0x9f: /* SUB */ { UINT8 acc = cpustate->A + (GET_REG(cpustate, opcode & 0x0f) ^ 0x0f) + (cpustate->C ^ 1); - cpustate->A = acc & 0x0f; + cpustate->A = acc & 0x0f; cpustate->C = (acc >> 4) & 1; } break; - case 0xa0: case 0xa1: case 0xa2: case 0xa3: - case 0xa4: case 0xa5: case 0xa6: case 0xa7: - case 0xa8: case 0xa9: case 0xaa: case 0xab: + case 0xa0: case 0xa1: case 0xa2: case 0xa3: + case 0xa4: case 0xa5: case 0xa6: case 0xa7: + case 0xa8: case 0xa9: case 0xaa: case 0xab: case 0xac: case 0xad: case 0xae: case 0xaf: /* LD */ cpustate->A = GET_REG(cpustate, opcode & 0x0f); break; - case 0xb0: case 0xb1: case 0xb2: case 0xb3: - case 0xb4: case 0xb5: case 0xb6: case 0xb7: - case 0xb8: case 0xb9: case 0xba: case 0xbb: + case 0xb0: case 0xb1: case 0xb2: case 0xb3: + case 0xb4: case 0xb5: case 0xb6: case 0xb7: + case 0xb8: case 0xb9: case 0xba: case 0xbb: case 0xbc: case 0xbd: case 0xbe: case 0xbf: /* XCH */ { UINT8 temp = cpustate->A; cpustate->A = GET_REG(cpustate, opcode & 0x0f); SET_REG(cpustate, opcode & 0x0f, temp); - } + } break; - case 0xc0: case 0xc1: case 0xc2: case 0xc3: - case 0xc4: case 0xc5: case 0xc6: case 0xc7: - case 0xc8: case 0xc9: case 0xca: case 0xcb: - case 0xcc: case 0xcd: case 0xce: case 0xcf: /* BBL */ + case 0xc0: case 0xc1: case 0xc2: case 0xc3: + case 0xc4: case 0xc5: case 0xc6: case 0xc7: + case 0xc8: case 0xc9: case 0xca: case 0xcb: + case 0xcc: case 0xcd: case 0xce: case 0xcf: /* BBL */ POP_STACK(cpustate); cpustate->A = opcode & 0x0f; cpustate->PC = GET_PC; break; - case 0xd0: case 0xd1: case 0xd2: case 0xd3: - case 0xd4: case 0xd5: case 0xd6: case 0xd7: - case 0xd8: case 0xd9: case 0xda: case 0xdb: + case 0xd0: case 0xd1: case 0xd2: case 0xd3: + case 0xd4: case 0xd5: case 0xd6: case 0xd7: + case 0xd8: case 0xd9: case 0xda: case 0xdb: case 0xdc: case 0xdd: case 0xde: case 0xdf: /* LDM */ cpustate->A = opcode & 0x0f; break; - case 0xe0: /* WRM */ + case 0xe0: /* WRM */ WM(cpustate,cpustate->A); break; case 0xe1: /* WMP */ @@ -366,14 +366,14 @@ static void execute_one(i4004_state *cpustate, int opcode) case 0xe9: /* RDM */ cpustate->A = RM(cpustate); break; - case 0xea: /* RDR */ + case 0xea: /* RDR */ cpustate->A = RIO(cpustate); break; case 0xeb: /* ADM */ cpustate->A += RM(cpustate) + cpustate->C; cpustate->C = cpustate->A >> 4; cpustate->A &= 0x0f; - break; + break; case 0xec: /* RD0 */ cpustate->A = RMS(cpustate,0); break; @@ -386,16 +386,16 @@ static void execute_one(i4004_state *cpustate, int opcode) case 0xef: /* RD3 */ cpustate->A = RMS(cpustate,3); break; - + case 0xf0: /* CLB */ cpustate->A = 0; cpustate->C = 0; - break; + break; case 0xf1: /* CLC */ cpustate->C = 0; break; case 0xf2: /* IAC */ - cpustate->A = cpustate->A++; + cpustate->A = cpustate->A++; cpustate->C = cpustate->A >> 4; cpustate->A &= 0x0f; break; @@ -424,7 +424,7 @@ static void execute_one(i4004_state *cpustate, int opcode) case 0xf8: /* DAC */ cpustate->A = cpustate->A + 0x0f; cpustate->C = cpustate->A >> 4; - cpustate->A &= 0x0f; + cpustate->A &= 0x0f; break; case 0xf9: /* TCS */ cpustate->A = cpustate->C ? 10 : 9; @@ -481,20 +481,20 @@ static CPU_EXECUTE( i4004 ) static CPU_INIT( i4004 ) { i4004_state *cpustate = get_safe_token(device); - + /* set up the state table */ cpustate->state = state_table_template; cpustate->state.baseptr = cpustate; cpustate->state.subtypemask = 1; - + cpustate->device = device; cpustate->program = memory_find_address_space(device, ADDRESS_SPACE_PROGRAM); cpustate->data = memory_find_address_space(device, ADDRESS_SPACE_DATA); cpustate->io = memory_find_address_space(device, ADDRESS_SPACE_IO); - + state_save_register_device_item(device, 0, cpustate->PC); - state_save_register_device_item(device, 0, cpustate->A); + state_save_register_device_item(device, 0, cpustate->A); state_save_register_device_item(device, 0, cpustate->C); state_save_register_device_item(device, 0, cpustate->TEST); state_save_register_device_item(device, 0, cpustate->pc_pos); @@ -509,8 +509,8 @@ static CPU_INIT( i4004 ) state_save_register_device_item(device, 0, cpustate->R[4]); state_save_register_device_item(device, 0, cpustate->R[5]); state_save_register_device_item(device, 0, cpustate->R[6]); - state_save_register_device_item(device, 0, cpustate->R[7]); - state_save_register_device_item(device, 0, cpustate->RAM); + state_save_register_device_item(device, 0, cpustate->R[7]); + state_save_register_device_item(device, 0, cpustate->RAM); } @@ -531,7 +531,7 @@ static CPU_RESET( i4004 ) memset(cpustate->ADDR,0,sizeof(cpustate->ADDR)); cpustate->RAM.d = 0; cpustate->PC = GET_PC; - + } |