diff options
Diffstat (limited to 'trunk/src/emu/cpu/pdp1/tx0.c')
-rw-r--r-- | trunk/src/emu/cpu/pdp1/tx0.c | 1305 |
1 files changed, 1305 insertions, 0 deletions
diff --git a/trunk/src/emu/cpu/pdp1/tx0.c b/trunk/src/emu/cpu/pdp1/tx0.c new file mode 100644 index 00000000000..04d809ec3c1 --- /dev/null +++ b/trunk/src/emu/cpu/pdp1/tx0.c @@ -0,0 +1,1305 @@ +/* + TX-0 emulator + + Two variants: + * initial model 64kWord RAM + * later model 8kWord RAM + + Raphael Nabet 2004 +*/ + +#include "emu.h" +#include "debugger.h" +#include "tx0.h" + +#define LOG 0 +#define LOG_EXTRA 0 + +static void execute_instruction_64kw(device_t *device); +static void execute_instruction_8kw(device_t *device); +static void pulse_reset(device_t *device); + + +/* TX-0 Registers */ +typedef struct _tx0_state tx0_state; +struct _tx0_state +{ + const tx0_reset_param_t *iface; + + /* processor registers */ + int mbr; /* memory buffer register (18 bits) */ + int ac; /* accumulator (18 bits) */ + int mar; /* memory address register (16 (64kW) or 13 (8kW) bits) */ + int pc; /* program counter (16 (64kW) or 13 (8kW) bits) */ + int ir; /* instruction register (2 (64kW) or 5 (8kW) bits) */ + int lr; /* live register (18 bits) */ + int xr; /* index register (14 bits) (8kW only) */ + int pf; /* program flags (6 bits expandable to 10) (8kW only) */ + + /* operator panel switches */ + int tbr; /* toggle switch buffer register (18 bits) */ + int tac; /* toggle switch accumulator (18 bits) */ + int tss[16]; /* toggle switch storage (18 bits * 16) */ + unsigned int cm_sel : 16; /* individual cm select (1 bit * 16) */ + unsigned int lr_sel : 16; /* individual lr select (1 bit * 16) */ + unsigned int gbl_cm_sel : 1;/* global cm select (1 bit) */ + unsigned int stop_cyc0 : 1; /* stop on cycle 0 */ + unsigned int stop_cyc1 : 1; /* stop on cycle 1 */ + + /* processor state flip-flops */ + unsigned int run : 1; /* processor is running */ + unsigned int rim : 1; /* processor is in read-in mode */ + unsigned int cycle : 2; /* 0 -> fetch */ + /* 1 -> execute (except for taken branches) */ + /* 2 -> extra execute cycle for SXA and ADO */ + + unsigned int ioh : 1; /* i-o halt: processor is executing an Input-Output Transfer wait */ + unsigned int ios : 1; /* i-o synchronizer: set on i-o operation completion */ + + /* additional emulator state variables */ + int rim_step; /* current step in rim execution */ + + int address_mask; /* address mask */ + int ir_mask; /* IR mask */ + + int icount; + + legacy_cpu_device *device; + address_space *program; +}; + +INLINE tx0_state *get_safe_token(device_t *device) +{ + assert(device != NULL); + assert(device->type() == TX0_64KW || + device->type() == TX0_8KW); + return (tx0_state *)downcast<legacy_cpu_device *>(device)->token(); +} + +#define READ_TX0_18BIT(A) ((signed)cpustate->program->read_dword((A)<<2)) +#define WRITE_TX0_18BIT(A,V) (cpustate->program->write_dword((A)<<2,(V))) + + +#define io_handler_rim 3 + +#define PC cpustate->pc +#define IR cpustate->ir +#define MBR cpustate->mbr +#define MAR cpustate->mar +#define AC cpustate->ac +#define LR cpustate->lr +#define XR cpustate->xr +#define PF cpustate->pf + +#define ADDRESS_MASK_64KW 0177777 +#define ADDRESS_MASK_8KW 0017777 + +#define INCREMENT_PC_64KW (PC = (PC+1) & ADDRESS_MASK_64KW) +#define INCREMENT_PC_8KW (PC = (PC+1) & ADDRESS_MASK_8KW) + + +static int tx0_read(tx0_state *cpustate, offs_t address) +{ + if ((address >= 16) || (cpustate->gbl_cm_sel) || ((cpustate->cm_sel >> address) & 1)) + /* core memory (CM) */ + return READ_TX0_18BIT(address); + else if ((cpustate->lr_sel >> address) & 1) + /* live register (LR) */ + return LR; + + /* toggle switch storage (TSS) */ + return cpustate->tss[address]; +} + +static void tx0_write(tx0_state *cpustate, offs_t address, int data) +{ + if ((address >= 16) || (cpustate->gbl_cm_sel) || ((cpustate->cm_sel >> address) & 1)) + /* core memory (CM) */ + WRITE_TX0_18BIT(address, data); + else if ((cpustate->lr_sel >> address) & 1) + /* live register (LR) */ + LR = data; + else + /* toggle switch storage (TSS) */ + /* TSS is read-only */ + ; +} + +static void tx0_init_common(legacy_cpu_device *device, device_irq_acknowledge_callback irqcallback, int is_64kw) +{ + tx0_state *cpustate = get_safe_token(device); + + /* clean-up */ + cpustate->iface = (const tx0_reset_param_t *)device->static_config(); + + cpustate->address_mask = is_64kw ? ADDRESS_MASK_64KW : ADDRESS_MASK_8KW; + cpustate->ir_mask = is_64kw ? 03 : 037; + + cpustate->device = device; + cpustate->program = device->space(AS_PROGRAM); +} + +static CPU_INIT( tx0_64kw ) +{ + tx0_init_common(device, irqcallback, 1); +} + +static CPU_INIT( tx0_8kw) +{ + tx0_init_common(device, irqcallback, 0); +} + +static CPU_RESET( tx0 ) +{ + tx0_state *cpustate = get_safe_token(device); + + /* reset CPU flip-flops */ + pulse_reset(device); + + cpustate->gbl_cm_sel = 1; /* HACK */ +} + +/* execute instructions on this CPU until icount expires */ +static CPU_EXECUTE( tx0_64kw ) +{ + tx0_state *cpustate = get_safe_token(device); + + do + { + debugger_instruction_hook(device, PC); + + + if (cpustate->ioh && cpustate->ios) + { + cpustate->ioh = 0; + cpustate->ios = 0; + } + + + if ((! cpustate->run) && (! cpustate->rim)) + cpustate->icount = 0; /* if processor is stopped, just burn cycles */ + else if (cpustate->rim) + { + switch (cpustate->rim_step) + { + case 0: + /* read first word as instruction */ + AC = 0; + if (cpustate->iface->io_handlers[io_handler_rim]) + (*cpustate->iface->io_handlers[io_handler_rim])(device); /* data will be transferred to AC */ + cpustate->rim_step = 1; + break; + + case 1: + if (! cpustate->ios) + { /* transfer incomplete: wait some more */ + cpustate->icount = 0; + } + else + { /* data transfer complete */ + cpustate->ios = 0; + + MBR = AC; + IR = MBR >> 16; /* basic opcode */ + if ((IR == 2) || (IR == 1)) /* trn or add instruction? */ + { + PC = MBR & ADDRESS_MASK_64KW; + cpustate->rim = 0; /* exit read-in mode */ + cpustate->run = (IR == 2) ? 1 : 0; /* stop if add instruction */ + cpustate->rim_step = 0; + } + else if ((IR == 0) || (IR == 3)) /* sto or opr instruction? */ + { + MAR = MBR & ADDRESS_MASK_64KW; + cpustate->rim_step = 2; + } + } + break; + + case 2: + /* read second word as data */ + AC = 0; + if (cpustate->iface->io_handlers[io_handler_rim]) + (*cpustate->iface->io_handlers[io_handler_rim])(device); /* data will be transferred to AC */ + cpustate->rim_step = 3; + break; + + case 3: + if (! cpustate->ios) + { /* transfer incomplete: wait some more */ + cpustate->icount = 0; + } + else + { /* data transfer complete */ + cpustate->ios = 0; + + tx0_write(cpustate, MAR, MBR = AC); + + cpustate->rim_step = 0; + } + break; + } + } + else + { + if (cpustate->cycle == 0) + { /* fetch new instruction */ + MBR = tx0_read(cpustate, MAR = PC); + INCREMENT_PC_64KW; + IR = MBR >> 16; /* basic opcode */ + MAR = MBR & ADDRESS_MASK_64KW; + } + + if (! cpustate->ioh) + { + if ((cpustate->stop_cyc0 && (cpustate->cycle == 0)) + || (cpustate->stop_cyc1 && (cpustate->cycle == 1))) + cpustate->run = 0; + + execute_instruction_64kw(device); /* execute instruction */ + } + + cpustate->icount --; + } + } + while (cpustate->icount > 0); +} + +/* execute instructions on this CPU until icount expires */ +static CPU_EXECUTE( tx0_8kw ) +{ + tx0_state *cpustate = get_safe_token(device); + + do + { + debugger_instruction_hook(device, PC); + + + if (cpustate->ioh && cpustate->ios) + { + cpustate->ioh = 0; + cpustate->ios = 0; + } + + + if ((! cpustate->run) && (! cpustate->rim)) + cpustate->icount = 0; /* if processor is stopped, just burn cycles */ + else if (cpustate->rim) + { + switch (cpustate->rim_step) + { + case 0: + /* read first word as instruction */ + AC = 0; + if (cpustate->iface->io_handlers[io_handler_rim]) + (*cpustate->iface->io_handlers[io_handler_rim])(device); /* data will be transferred to AC */ + cpustate->rim_step = 1; + break; + + case 1: + if (! cpustate->ios) + { /* transfer incomplete: wait some more */ + cpustate->icount = 0; + } + else + { /* data transfer complete */ + cpustate->ios = 0; + + MBR = AC; + IR = MBR >> 13; /* basic opcode */ + if ((IR == 16) || (IR == 8)) /* trn or add instruction? */ + { + PC = MBR & ADDRESS_MASK_8KW; + cpustate->rim = 0; /* exit read-in mode */ + cpustate->run = (IR == 16) ? 1 : 0; /* stop if add instruction */ + cpustate->rim_step = 0; + } + else if ((IR == 0) || (IR == 24)) /* sto or opr instruction? */ + { + MAR = MBR & ADDRESS_MASK_8KW; + cpustate->rim_step = 2; + } + } + break; + + case 2: + /* read second word as data */ + AC = 0; + if (cpustate->iface->io_handlers[io_handler_rim]) + (*cpustate->iface->io_handlers[io_handler_rim])(device); /* data will be transferred to AC */ + cpustate->rim_step = 3; + break; + + case 3: + if (! cpustate->ios) + { /* transfer incomplete: wait some more */ + cpustate->icount = 0; + } + else + { /* data transfer complete */ + cpustate->ios = 0; + + tx0_write(cpustate, MAR, MBR = AC); + + cpustate->rim_step = 0; + } + break; + } + } + else + { + if (cpustate->cycle == 0) + { /* fetch new instruction */ + MBR = tx0_read(cpustate, MAR = PC); + INCREMENT_PC_8KW; + IR = MBR >> 13; /* basic opcode */ + MAR = MBR & ADDRESS_MASK_8KW; + } + + if (! cpustate->ioh) + { + if ((cpustate->stop_cyc0 && (cpustate->cycle == 0)) + || (cpustate->stop_cyc1 && (cpustate->cycle == 1))) + cpustate->run = 0; + + execute_instruction_8kw(device); /* execute instruction */ + } + + cpustate->icount -= 1; + } + } + while (cpustate->icount > 0); +} + + +static CPU_SET_INFO( tx0 ) +{ + tx0_state *cpustate = get_safe_token(device); + + switch (state) + { + /* --- the following bits of info are set as 64-bit signed integers --- */ + case CPUINFO_INT_SP: (void) info->i; /* no SP */ break; + case CPUINFO_INT_PC: + case CPUINFO_INT_REGISTER + TX0_PC: PC = info->i & cpustate->address_mask; break; + case CPUINFO_INT_REGISTER + TX0_IR: IR = info->i & cpustate->ir_mask; /* weird idea */ break; + case CPUINFO_INT_REGISTER + TX0_MBR: MBR = info->i & 0777777; break; + case CPUINFO_INT_REGISTER + TX0_MAR: MAR = info->i & cpustate->address_mask; break; + case CPUINFO_INT_REGISTER + TX0_AC: AC = info->i & 0777777; break; + case CPUINFO_INT_REGISTER + TX0_LR: LR = info->i & 0777777; break; + case CPUINFO_INT_REGISTER + TX0_XR: XR = info->i & 0037777; break; + case CPUINFO_INT_REGISTER + TX0_PF: PF = info->i & 077; break; + case CPUINFO_INT_REGISTER + TX0_TBR: cpustate->tbr = info->i & 0777777; break; + case CPUINFO_INT_REGISTER + TX0_TAC: cpustate->tac = info->i & 0777777; break; + case CPUINFO_INT_REGISTER + TX0_TSS00: + case CPUINFO_INT_REGISTER + TX0_TSS01: + case CPUINFO_INT_REGISTER + TX0_TSS02: + case CPUINFO_INT_REGISTER + TX0_TSS03: + case CPUINFO_INT_REGISTER + TX0_TSS04: + case CPUINFO_INT_REGISTER + TX0_TSS05: + case CPUINFO_INT_REGISTER + TX0_TSS06: + case CPUINFO_INT_REGISTER + TX0_TSS07: + case CPUINFO_INT_REGISTER + TX0_TSS10: + case CPUINFO_INT_REGISTER + TX0_TSS11: + case CPUINFO_INT_REGISTER + TX0_TSS12: + case CPUINFO_INT_REGISTER + TX0_TSS13: + case CPUINFO_INT_REGISTER + TX0_TSS14: + case CPUINFO_INT_REGISTER + TX0_TSS15: + case CPUINFO_INT_REGISTER + TX0_TSS16: + case CPUINFO_INT_REGISTER + TX0_TSS17: cpustate->tss[state-(CPUINFO_INT_REGISTER + TX0_TSS00)] = info->i & 0777777; break; + case CPUINFO_INT_REGISTER + TX0_CM_SEL: cpustate->cm_sel = info->i & 0177777; break; + case CPUINFO_INT_REGISTER + TX0_LR_SEL: cpustate->lr_sel = info->i & 0177777; break; + case CPUINFO_INT_REGISTER + TX0_GBL_CM_SEL: cpustate->gbl_cm_sel = info->i ? 1 : 0; break; + case CPUINFO_INT_REGISTER + TX0_STOP_CYC0: cpustate->stop_cyc0 = info->i ? 1 : 0; break; + case CPUINFO_INT_REGISTER + TX0_STOP_CYC1: cpustate->stop_cyc1 = info->i ? 1 : 0; break; + case CPUINFO_INT_REGISTER + TX0_RUN: cpustate->run = info->i ? 1 : 0; break; + case CPUINFO_INT_REGISTER + TX0_RIM: cpustate->rim = info->i ? 1 : 0; break; + case CPUINFO_INT_REGISTER + TX0_CYCLE: if (LOG) logerror("tx0_set_reg to cycle counter ignored\n");/* no way!*/ break; + case CPUINFO_INT_REGISTER + TX0_IOH: if (LOG) logerror("tx0_set_reg to ioh flip-flop ignored\n");/* no way!*/ break; + case CPUINFO_INT_REGISTER + TX0_IOS: if (LOG) logerror("tx0_set_reg to ios flip-flop ignored\n");/* no way!*/ break; + case CPUINFO_INT_REGISTER + TX0_RESET: pulse_reset(device); break; + case CPUINFO_INT_REGISTER + TX0_IO_COMPLETE:cpustate->ios = 1; break; + } +} + + +CPU_GET_INFO( tx0_64kw ) +{ + tx0_state *cpustate = ( device != NULL && device->token() != NULL ) ? get_safe_token(device) : NULL; + + switch (state) + { + /* --- the following bits of info are returned as 64-bit signed integers --- */ + case CPUINFO_INT_CONTEXT_SIZE: info->i = sizeof(tx0_state); break; + case CPUINFO_INT_INPUT_LINES: info->i = 0; break; + case CPUINFO_INT_DEFAULT_IRQ_VECTOR: info->i = 0; break; + case DEVINFO_INT_ENDIANNESS: info->i = ENDIANNESS_BIG; /*don't care*/ break; + case CPUINFO_INT_CLOCK_MULTIPLIER: info->i = 1; break; + case CPUINFO_INT_CLOCK_DIVIDER: info->i = 1; break; + case CPUINFO_INT_MIN_INSTRUCTION_BYTES: info->i = 4; break; + case CPUINFO_INT_MAX_INSTRUCTION_BYTES: info->i = 4; break; + case CPUINFO_INT_MIN_CYCLES: info->i = 1; break; + case CPUINFO_INT_MAX_CYCLES: info->i = 3; break; + + case DEVINFO_INT_DATABUS_WIDTH + AS_PROGRAM: info->i = 32; break; + case DEVINFO_INT_ADDRBUS_WIDTH + AS_PROGRAM: info->i = 16; break; + case DEVINFO_INT_ADDRBUS_SHIFT + AS_PROGRAM: info->i = -2; break; + case DEVINFO_INT_DATABUS_WIDTH + AS_DATA: info->i = 0; break; + case DEVINFO_INT_ADDRBUS_WIDTH + AS_DATA: info->i = 0; break; + case DEVINFO_INT_ADDRBUS_SHIFT + AS_DATA: info->i = 0; break; + case DEVINFO_INT_DATABUS_WIDTH + AS_IO: info->i = 0; break; + case DEVINFO_INT_ADDRBUS_WIDTH + AS_IO: info->i = 0; break; + case DEVINFO_INT_ADDRBUS_SHIFT + AS_IO: info->i = 0; break; + + case CPUINFO_INT_SP: info->i = 0; /* no SP */ break; + case CPUINFO_INT_PC: info->i = PC; break; + case CPUINFO_INT_PREVIOUSPC: info->i = 0; /* TODO??? */ break; + + case CPUINFO_INT_REGISTER + TX0_PC: info->i = PC; break; + case CPUINFO_INT_REGISTER + TX0_IR: info->i = IR; break; + case CPUINFO_INT_REGISTER + TX0_MBR: info->i = MBR; break; + case CPUINFO_INT_REGISTER + TX0_MAR: info->i = MAR; break; + case CPUINFO_INT_REGISTER + TX0_AC: info->i = AC; break; + case CPUINFO_INT_REGISTER + TX0_LR: info->i = LR; break; + case CPUINFO_INT_REGISTER + TX0_XR: info->i = XR; break; + case CPUINFO_INT_REGISTER + TX0_PF: info->i = PF; break; + case CPUINFO_INT_REGISTER + TX0_TBR: info->i = cpustate->tbr; break; + case CPUINFO_INT_REGISTER + TX0_TAC: info->i = cpustate->tac; break; + case CPUINFO_INT_REGISTER + TX0_TSS00: + case CPUINFO_INT_REGISTER + TX0_TSS01: + case CPUINFO_INT_REGISTER + TX0_TSS02: + case CPUINFO_INT_REGISTER + TX0_TSS03: + case CPUINFO_INT_REGISTER + TX0_TSS04: + case CPUINFO_INT_REGISTER + TX0_TSS05: + case CPUINFO_INT_REGISTER + TX0_TSS06: + case CPUINFO_INT_REGISTER + TX0_TSS07: + case CPUINFO_INT_REGISTER + TX0_TSS10: + case CPUINFO_INT_REGISTER + TX0_TSS11: + case CPUINFO_INT_REGISTER + TX0_TSS12: + case CPUINFO_INT_REGISTER + TX0_TSS13: + case CPUINFO_INT_REGISTER + TX0_TSS14: + case CPUINFO_INT_REGISTER + TX0_TSS15: + case CPUINFO_INT_REGISTER + TX0_TSS16: + case CPUINFO_INT_REGISTER + TX0_TSS17: info->i = cpustate->tss[state-(CPUINFO_INT_REGISTER + TX0_TSS00)]; break; + case CPUINFO_INT_REGISTER + TX0_CM_SEL: info->i = cpustate->cm_sel; break; + case CPUINFO_INT_REGISTER + TX0_LR_SEL: info->i = cpustate->lr_sel; break; + case CPUINFO_INT_REGISTER + TX0_GBL_CM_SEL: info->i = cpustate->gbl_cm_sel; break; + case CPUINFO_INT_REGISTER + TX0_STOP_CYC0: info->i = cpustate->stop_cyc0; break; + case CPUINFO_INT_REGISTER + TX0_STOP_CYC1: info->i = cpustate->stop_cyc1; break; + case CPUINFO_INT_REGISTER + TX0_RUN: info->i = cpustate->run; break; + case CPUINFO_INT_REGISTER + TX0_RIM: info->i = cpustate->rim; break; + case CPUINFO_INT_REGISTER + TX0_CYCLE: info->i = cpustate->cycle; break; + case CPUINFO_INT_REGISTER + TX0_IOH: info->i = cpustate->ioh; break; + case CPUINFO_INT_REGISTER + TX0_IOS: info->i = cpustate->ios; break; + + /* --- the following bits of info are returned as pointers to data or functions --- */ + case CPUINFO_FCT_SET_INFO: info->setinfo = CPU_SET_INFO_NAME(tx0); break; + case CPUINFO_FCT_INIT: info->init = CPU_INIT_NAME(tx0_64kw); break; + case CPUINFO_FCT_RESET: info->reset = CPU_RESET_NAME(tx0); break; + case CPUINFO_FCT_EXECUTE: info->execute = CPU_EXECUTE_NAME(tx0_64kw); break; + case CPUINFO_FCT_BURN: info->burn = NULL; break; + case CPUINFO_FCT_DISASSEMBLE: info->disassemble = CPU_DISASSEMBLE_NAME(tx0_64kw); break; + case CPUINFO_PTR_INSTRUCTION_COUNTER: info->icount = &cpustate->icount; break; + + /* --- the following bits of info are returned as NULL-terminated strings --- */ + case DEVINFO_STR_NAME: strcpy(info->s, "TX-0"); break; + case DEVINFO_STR_FAMILY: strcpy(info->s, "TX-0"); break; + case DEVINFO_STR_VERSION: strcpy(info->s, "1.0"); break; + case DEVINFO_STR_SOURCE_FILE: strcpy(info->s, __FILE__); break; + case DEVINFO_STR_CREDITS: strcpy(info->s, "Raphael Nabet"); break; + + case CPUINFO_STR_FLAGS: strcpy(info->s, ""); break; + + case CPUINFO_STR_REGISTER + TX0_PC: sprintf(info->s, "PC:0%06o", PC); break; + case CPUINFO_STR_REGISTER + TX0_IR: sprintf(info->s, "IR:0%02o", IR); break; + case CPUINFO_STR_REGISTER + TX0_MBR: sprintf(info->s, "MBR:0%06o", MBR); break; + case CPUINFO_STR_REGISTER + TX0_MAR: sprintf(info->s, "MAR:0%06o", MAR); break; + case CPUINFO_STR_REGISTER + TX0_AC: sprintf(info->s, "AC:0%06o", AC); break; + case CPUINFO_STR_REGISTER + TX0_LR: sprintf(info->s, "LR:0%06o", LR); break; + case CPUINFO_STR_REGISTER + TX0_XR: sprintf(info->s, "XR:0%05o", XR); break; + case CPUINFO_STR_REGISTER + TX0_PF: sprintf(info->s, "PF:0%02o", PF); break; + case CPUINFO_STR_REGISTER + TX0_TBR: sprintf(info->s, "TBR:0%06o", cpustate->tbr); break; + case CPUINFO_STR_REGISTER + TX0_TAC: sprintf(info->s, "TAC:0%06o", cpustate->tac); break; + case CPUINFO_STR_REGISTER + TX0_TSS00: + case CPUINFO_STR_REGISTER + TX0_TSS01: + case CPUINFO_STR_REGISTER + TX0_TSS02: + case CPUINFO_STR_REGISTER + TX0_TSS03: + case CPUINFO_STR_REGISTER + TX0_TSS04: + case CPUINFO_STR_REGISTER + TX0_TSS05: + case CPUINFO_STR_REGISTER + TX0_TSS06: + case CPUINFO_STR_REGISTER + TX0_TSS07: + case CPUINFO_STR_REGISTER + TX0_TSS10: + case CPUINFO_STR_REGISTER + TX0_TSS11: + case CPUINFO_STR_REGISTER + TX0_TSS12: + case CPUINFO_STR_REGISTER + TX0_TSS13: + case CPUINFO_STR_REGISTER + TX0_TSS14: + case CPUINFO_STR_REGISTER + TX0_TSS15: + case CPUINFO_STR_REGISTER + TX0_TSS16: + case CPUINFO_STR_REGISTER + TX0_TSS17: sprintf(info->s, "TSS%02o:0%06o", state-(CPUINFO_STR_REGISTER + TX0_TSS00), cpustate->tss[state-(CPUINFO_STR_REGISTER + TX0_TSS00)]); break; + case CPUINFO_STR_REGISTER + TX0_CM_SEL: sprintf(info->s, "CMSEL:0%06o", cpustate->cm_sel); break; + case CPUINFO_STR_REGISTER + TX0_LR_SEL: sprintf(info->s, "LRSEL:0%06o", cpustate->lr_sel); break; + case CPUINFO_STR_REGISTER + TX0_GBL_CM_SEL: sprintf(info->s, "GBLCMSEL:%X", cpustate->gbl_cm_sel); break; + case CPUINFO_STR_REGISTER + TX0_STOP_CYC0: sprintf(info->s, "STOPCYC0:%X", cpustate->stop_cyc0); break; + case CPUINFO_STR_REGISTER + TX0_STOP_CYC1: sprintf(info->s, "STOPCYC1:%X", cpustate->stop_cyc1); break; + case CPUINFO_STR_REGISTER + TX0_RUN: sprintf(info->s, "RUN:%X", cpustate->run); break; + case CPUINFO_STR_REGISTER + TX0_RIM: sprintf(info->s, "RIM:%X", cpustate->rim); break; + case CPUINFO_STR_REGISTER + TX0_CYCLE: sprintf(info->s, "CYCLE:%X", cpustate->cycle); break; + case CPUINFO_STR_REGISTER + TX0_IOH: sprintf(info->s, "IOH:%X", cpustate->ioh); break; + case CPUINFO_STR_REGISTER + TX0_IOS: sprintf(info->s, "IOS:%X", cpustate->ios); break; + case CPUINFO_IS_OCTAL: info->i = true; break; + } +} + +CPU_GET_INFO( tx0_8kw ) +{ + tx0_state *cpustate = ( device != NULL && device->token() != NULL ) ? get_safe_token(device) : NULL; + + switch (state) + { + /* --- the following bits of info are returned as 64-bit signed integers --- */ + case CPUINFO_INT_CONTEXT_SIZE: info->i = sizeof(tx0_state); break; + case CPUINFO_INT_INPUT_LINES: info->i = 0; break; + case CPUINFO_INT_DEFAULT_IRQ_VECTOR: info->i = 0; break; + case DEVINFO_INT_ENDIANNESS: info->i = ENDIANNESS_BIG; /*don't care*/ break; + case CPUINFO_INT_CLOCK_MULTIPLIER: info->i = 1; break; + case CPUINFO_INT_CLOCK_DIVIDER: info->i = 1; break; + case CPUINFO_INT_MIN_INSTRUCTION_BYTES: info->i = 4; break; + case CPUINFO_INT_MAX_INSTRUCTION_BYTES: info->i = 4; break; + case CPUINFO_INT_MIN_CYCLES: info->i = 1; break; + case CPUINFO_INT_MAX_CYCLES: info->i = 3; break; + + case DEVINFO_INT_DATABUS_WIDTH + AS_PROGRAM: info->i = 32; break; + case DEVINFO_INT_ADDRBUS_WIDTH + AS_PROGRAM: info->i = 13; break; + case DEVINFO_INT_ADDRBUS_SHIFT + AS_PROGRAM: info->i = -2; break; + case DEVINFO_INT_DATABUS_WIDTH + AS_DATA: info->i = 0; break; + case DEVINFO_INT_ADDRBUS_WIDTH + AS_DATA: info->i = 0; break; + case DEVINFO_INT_ADDRBUS_SHIFT + AS_DATA: info->i = 0; break; + case DEVINFO_INT_DATABUS_WIDTH + AS_IO: info->i = 0; break; + case DEVINFO_INT_ADDRBUS_WIDTH + AS_IO: info->i = 0; break; + case DEVINFO_INT_ADDRBUS_SHIFT + AS_IO: info->i = 0; break; + + case CPUINFO_INT_SP: info->i = 0; /* no SP */ break; + case CPUINFO_INT_PC: info->i = PC; break; + case CPUINFO_INT_PREVIOUSPC: info->i = 0; /* TODO??? */ break; + + case CPUINFO_INT_REGISTER + TX0_PC: info->i = PC; break; + case CPUINFO_INT_REGISTER + TX0_IR: info->i = IR; break; + case CPUINFO_INT_REGISTER + TX0_MBR: info->i = MBR; break; + case CPUINFO_INT_REGISTER + TX0_MAR: info->i = MAR; break; + case CPUINFO_INT_REGISTER + TX0_AC: info->i = AC; break; + case CPUINFO_INT_REGISTER + TX0_LR: info->i = LR; break; + case CPUINFO_INT_REGISTER + TX0_XR: info->i = XR; break; + case CPUINFO_INT_REGISTER + TX0_PF: info->i = PF; break; + case CPUINFO_INT_REGISTER + TX0_TBR: info->i = cpustate->tbr; break; + case CPUINFO_INT_REGISTER + TX0_TAC: info->i = cpustate->tac; break; + case CPUINFO_INT_REGISTER + TX0_TSS00: + case CPUINFO_INT_REGISTER + TX0_TSS01: + case CPUINFO_INT_REGISTER + TX0_TSS02: + case CPUINFO_INT_REGISTER + TX0_TSS03: + case CPUINFO_INT_REGISTER + TX0_TSS04: + case CPUINFO_INT_REGISTER + TX0_TSS05: + case CPUINFO_INT_REGISTER + TX0_TSS06: + case CPUINFO_INT_REGISTER + TX0_TSS07: + case CPUINFO_INT_REGISTER + TX0_TSS10: + case CPUINFO_INT_REGISTER + TX0_TSS11: + case CPUINFO_INT_REGISTER + TX0_TSS12: + case CPUINFO_INT_REGISTER + TX0_TSS13: + case CPUINFO_INT_REGISTER + TX0_TSS14: + case CPUINFO_INT_REGISTER + TX0_TSS15: + case CPUINFO_INT_REGISTER + TX0_TSS16: + case CPUINFO_INT_REGISTER + TX0_TSS17: info->i = cpustate->tss[state-(CPUINFO_INT_REGISTER + TX0_TSS00)]; break; + case CPUINFO_INT_REGISTER + TX0_CM_SEL: info->i = cpustate->cm_sel; break; + case CPUINFO_INT_REGISTER + TX0_LR_SEL: info->i = cpustate->lr_sel; break; + case CPUINFO_INT_REGISTER + TX0_GBL_CM_SEL: info->i = cpustate->gbl_cm_sel; break; + case CPUINFO_INT_REGISTER + TX0_STOP_CYC0: info->i = cpustate->stop_cyc0; break; + case CPUINFO_INT_REGISTER + TX0_STOP_CYC1: info->i = cpustate->stop_cyc1; break; + case CPUINFO_INT_REGISTER + TX0_RUN: info->i = cpustate->run; break; + case CPUINFO_INT_REGISTER + TX0_RIM: info->i = cpustate->rim; break; + case CPUINFO_INT_REGISTER + TX0_CYCLE: info->i = cpustate->cycle; break; + case CPUINFO_INT_REGISTER + TX0_IOH: info->i = cpustate->ioh; break; + case CPUINFO_INT_REGISTER + TX0_IOS: info->i = cpustate->ios; break; + + /* --- the following bits of info are returned as pointers to data or functions --- */ + case CPUINFO_FCT_SET_INFO: info->setinfo = CPU_SET_INFO_NAME(tx0); break; + case CPUINFO_FCT_INIT: info->init = CPU_INIT_NAME(tx0_8kw); break; + case CPUINFO_FCT_RESET: info->reset = CPU_RESET_NAME(tx0); break; + case CPUINFO_FCT_EXECUTE: info->execute = CPU_EXECUTE_NAME(tx0_8kw); break; + case CPUINFO_FCT_BURN: info->burn = NULL; break; + case CPUINFO_FCT_DISASSEMBLE: info->disassemble = CPU_DISASSEMBLE_NAME(tx0_8kw); break; + case CPUINFO_PTR_INSTRUCTION_COUNTER: info->icount = &cpustate->icount; break; + + /* --- the following bits of info are returned as NULL-terminated strings --- */ + case DEVINFO_STR_NAME: strcpy(info->s, "TX-0"); break; + case DEVINFO_STR_FAMILY: strcpy(info->s, "TX-0"); break; + case DEVINFO_STR_VERSION: strcpy(info->s, "1.0"); break; + case DEVINFO_STR_SOURCE_FILE: strcpy(info->s, __FILE__); break; + case DEVINFO_STR_CREDITS: strcpy(info->s, "Raphael Nabet"); break; + + case CPUINFO_STR_FLAGS: strcpy(info->s, ""); break; + + case CPUINFO_STR_REGISTER + TX0_PC: sprintf(info->s, "PC:0%06o", PC); break; + case CPUINFO_STR_REGISTER + TX0_IR: sprintf(info->s, "IR:0%02o", IR); break; + case CPUINFO_STR_REGISTER + TX0_MBR: sprintf(info->s, "MBR:0%06o", MBR); break; + case CPUINFO_STR_REGISTER + TX0_MAR: sprintf(info->s, "MAR:0%06o", MAR); break; + case CPUINFO_STR_REGISTER + TX0_AC: sprintf(info->s, "AC:0%06o", AC); break; + case CPUINFO_STR_REGISTER + TX0_LR: sprintf(info->s, "LR:0%06o", LR); break; + case CPUINFO_STR_REGISTER + TX0_XR: sprintf(info->s, "XR:0%05o", XR); break; + case CPUINFO_STR_REGISTER + TX0_PF: sprintf(info->s, "PF:0%02o", PF); break; break; + case CPUINFO_STR_REGISTER + TX0_TBR: sprintf(info->s, "TBR:0%06o", cpustate->tbr); break; + case CPUINFO_STR_REGISTER + TX0_TAC: sprintf(info->s, "TAC:0%06o", cpustate->tac); break; + case CPUINFO_STR_REGISTER + TX0_TSS00: + case CPUINFO_STR_REGISTER + TX0_TSS01: + case CPUINFO_STR_REGISTER + TX0_TSS02: + case CPUINFO_STR_REGISTER + TX0_TSS03: + case CPUINFO_STR_REGISTER + TX0_TSS04: + case CPUINFO_STR_REGISTER + TX0_TSS05: + case CPUINFO_STR_REGISTER + TX0_TSS06: + case CPUINFO_STR_REGISTER + TX0_TSS07: + case CPUINFO_STR_REGISTER + TX0_TSS10: + case CPUINFO_STR_REGISTER + TX0_TSS11: + case CPUINFO_STR_REGISTER + TX0_TSS12: + case CPUINFO_STR_REGISTER + TX0_TSS13: + case CPUINFO_STR_REGISTER + TX0_TSS14: + case CPUINFO_STR_REGISTER + TX0_TSS15: + case CPUINFO_STR_REGISTER + TX0_TSS16: + case CPUINFO_STR_REGISTER + TX0_TSS17: sprintf(info->s, "TSS%02o:0%06o", state-(CPUINFO_STR_REGISTER + TX0_TSS00), cpustate->tss[state-(CPUINFO_STR_REGISTER + TX0_TSS00)]); break; + case CPUINFO_STR_REGISTER + TX0_CM_SEL: sprintf(info->s, "CMSEL:0%06o", cpustate->cm_sel); break; + case CPUINFO_STR_REGISTER + TX0_LR_SEL: sprintf(info->s, "LRSEL:0%06o", cpustate->lr_sel); break; + case CPUINFO_STR_REGISTER + TX0_GBL_CM_SEL: sprintf(info->s, "GBLCMSEL:%X", cpustate->gbl_cm_sel); break; + case CPUINFO_STR_REGISTER + TX0_STOP_CYC0: sprintf(info->s, "STOPCYC0:%X", cpustate->stop_cyc0); break; + case CPUINFO_STR_REGISTER + TX0_STOP_CYC1: sprintf(info->s, "STOPCYC1:%X", cpustate->stop_cyc1); break; + case CPUINFO_STR_REGISTER + TX0_RUN: sprintf(info->s, "RUN:%X", cpustate->run); break; + case CPUINFO_STR_REGISTER + TX0_RIM: sprintf(info->s, "RIM:%X", cpustate->rim); break; + case CPUINFO_STR_REGISTER + TX0_CYCLE: sprintf(info->s, "CYCLE:%X", cpustate->cycle); break; + case CPUINFO_STR_REGISTER + TX0_IOH: sprintf(info->s, "IOH:%X", cpustate->ioh); break; + case CPUINFO_STR_REGISTER + TX0_IOS: sprintf(info->s, "IOS:%X", cpustate->ios); break; + case CPUINFO_IS_OCTAL: info->i = true; break; + } +} + + +/* execute one instruction */ +static void execute_instruction_64kw(device_t *device) +{ + tx0_state *cpustate = get_safe_token(device); + + if (! cpustate->cycle) + { + cpustate->cycle = 1; /* most frequent case */ + switch (IR) + { + case 0: /* STOre */ + case 1: /* ADD */ + break; + + case 2: /* TRansfer on Negative */ + if (AC & 0400000) + { + PC = MAR & ADDRESS_MASK_64KW; + cpustate->cycle = 0; /* instruction only takes one cycle if branch + is taken */ + } + break; + + case 3: /* OPeRate */ + if (MAR & 0100000) + /* (0.8) CLL = Clear the left nine digital positions of the AC */ + AC &= 0000777; + + if (MAR & 0040000) + /* (0.8) CLR = Clear the right nine digital positions of the AC */ + AC &= 0777000; + + if (((MAR & 0030000) >> 12) == 1) + /* (0.8) IOS In-Out Stop = Stop machine so that an In-Out command + (specified by digits 6 7 8 of MAR) may be executed */ + cpustate->ioh = 1; + + if (((MAR & 0007000) >> 9) != 0) + { + /* ((MAR & 0007000) >> 9) is device ID */ + /* 7: */ + /* (0.8) P7H = Punch holes 1-6 in flexo tape specified by AC + digital positions 2, 5, 8, 11, 14, and 17. Also punches a 7th + hole on tape. */ + /* 6: */ + /* (0.8) P6H = Same as P7H but no seventh hole */ + /* 4: */ + /* (0.8) PNT = Print one flexowriter character specified by AC + digits 2, 5, 8, 11, 14, and 17. */ + /* 1: */ + /* (0.8) R1C = Read one line of flexo tape so that tape positions + 1, 2, 3, 4, 5, and 6 will be put in the AC digital positions 0, + 3, 6, 9, 12 and 15. */ + /* 3: */ + /* (0.8) R3C = Read one line of flexo tape into AC digits 0, 3, 6, + 9, 12 and 15. Then cycle the AC one digital position; read the + next line on tape into AC digits 0, 3, 6, 9, 12 and 15, cycle + the AC right one digital position and read the third and last + line into AC digits 0, 3, 6, 9, 12 and 15. (This command is + equal to a triple CYR-R1C.) */ + /* 2: */ + /* (0.8) DIS = Intensify a point on the scope with x and y + coordinates where x is specified by AC digits 0-8 with digit 0 + being used as the sign and y is specified by AC digits 9-17 + with digit 9 being used as the sign for y. The complement + system is in effect when the signs are negative. */ + /* (5 is undefined) */ + int index = (MAR & 0007000) >> 9; + + if (cpustate->iface->io_handlers[index]) + (*cpustate->iface->io_handlers[index])(device); + cpustate->ioh = 1; + } + break; + } + } + else + { + cpustate->cycle = 0; /* always true */ + switch (IR) + { + case 0: /* STOre */ + tx0_write(cpustate, MAR, (MBR = AC)); + break; + + case 1: /* ADD */ + MBR = tx0_read(cpustate, MAR); + + AC = AC + MBR; + AC = (AC + (AC >> 18)) & 0777777; /* propagate carry around */ + + if (AC == 0777777) /* check for -0 */ + AC = 0; + break; + + case 2: /* TRansfer on Negative */ + break; + + case 3: /* OPeRate */ + if ((MAR & 0000104) == 0000100) + /* (1.1) PEN = Read the light pen flip-flops 1 and 2 into AC(0) and + AC(1). */ + /*...*/{ } + + if ((MAR & 0000104) == 0000004) + /* (1.1) TAC = Insert a one in each digital position of the AC + wherever there is a one in the corresponding digital position + of the TAC. */ + /*...*/ { } + + if (MAR & 0000040) + /* (1.2) COM = Complement every digit in the accumulator */ + AC ^= 0777777; + + if ((MAR & 0000003) == 1) + /* (1.2) AMB = Store the contents of the AC in the MBR. */ + MBR = AC; + + if ((MAR & 0000003) == 3) + /* (1.2) TBR = Store the contents of the TBR in the MBR. */ + /*...*/ { } + + if ((MAR & 0000003) == 2) + /* (1.3) LMB = Store the contents of the LR in the MBR. */ + MBR = LR; + break; + + if (((MAR & 0000600) >> 7) == 1) + /* (1.3) MLR = Store the contents of the MBR (memory buffer + register) in the live reg. */ + LR = MBR; + + if (((MAR & 0000600) >> 7) == 2) + /* (1.4) SHR = Shift the AC right one place, i.e. multiply the AC + by 2^-1 */ + AC >>= 1; + + if (((MAR & 0000600) >> 7) == 3) + /* (1.4) CYR = Cycle the AC right one digital position (AC(17) will + become AC(0)) */ + AC = (AC >> 1) | ((AC & 1) << 17); + + if (MAR & 0000020) + /* (1.4) PAD = Partial add AC to MBR, that is, for every digital + position of the MBR that contains a one, complement the digit + in the corresponding digital position of the AC. This is also + called a half add. */ + AC ^= MBR; + + if (MAR & 0000010) + { /* (1.7) CRY = Partial add the 18 digits of the AC to the + corresponding 18 digits of the carry. + + To determine what the 18 digits of the carry are, use the + following rule: + + "Grouping the AC and MBR digits into pairs and proceeding from + right to left, assign the carry digit of the next pair to a one + if in the present pair MBR = 1 and AC = 0 or if in the present + pair AC = 1 and carry 1. + + (Note: the 0th digit pair determines the 17th pair's carry + digit)" */ + AC ^= MBR; + + AC = AC + MBR; + AC = (AC + (AC >> 18)) & 0777777; /* propagate carry around */ + + if (AC == 0777777) /* check for -0 */ + AC = 0; + } + + if (((MAR & 0030000) >> 12) == 3) + /* (1.8) Hlt = Halt the computer */ + cpustate->run = 0; + + break; + } + } +} + +static void indexed_address_eval(tx0_state *cpustate) +{ + MAR = MAR + XR; + MAR = (MAR + (MAR >> 14)) & 0037777; /* propagate carry around */ + //if (MAR == 0037777) /* check for -0 */ + // MAR = 0; + if (MAR & 0020000) /* fix negative (right???) */ + MAR = (MAR + 1) & 0017777; +} + +/* execute one instruction */ +static void execute_instruction_8kw(device_t *device) +{ + tx0_state *cpustate = get_safe_token(device); + + if (! cpustate->cycle) + { + cpustate->cycle = 1; /* most frequent case */ + switch (IR) + { + case 0: /* STOre */ + case 1: /* STore indeXed */ + case 2: /* Store indeX in Address */ + case 3: /* ADd One */ + case 4: /* Store LR */ + case 5: /* Store Lr indeXed */ + case 6: /* STore Zero */ + case 8: /* ADD */ + case 9: /* ADd indeXed */ + case 10: /* LoaD indeX */ + case 11: /* AUgment indeX */ + case 12: /* Load LR */ + case 13: /* Load Lr indeXed */ + case 14: /* LoaD Ac */ + case 15: /* Load Ac indeXed */ + break; + + case 16: /* TRansfer on Negative */ + if (AC & 0400000) + { + PC = MAR & 0017777; + cpustate->cycle = 0; /* instruction only takes one cycle if branch + is taken */ + } + break; + + case 17: /* Transfer on ZEro */ + if ((AC == 0000000) || (AC == 0777777)) + { + PC = MAR & 0017777; + cpustate->cycle = 0; /* instruction only takes one cycle if branch + is taken */ + } + break; + + case 18: /* Transfer and Set indeX */ + XR = PC; + PC = MAR & 0017777; + cpustate->cycle = 0; /* instruction only takes one cycle if branch + is taken */ + break; + + case 19: /* Transfer and IndeX */ + if ((XR != 0000000) && (XR != 0037777)) + { + if (XR & 0020000) + XR ++; + else + XR--; + PC = MAR & 0017777; + cpustate->cycle = 0; /* instruction only takes one cycle if branch + is taken */ + } + break; + + case 21: /* TRansfer indeXed */ + indexed_address_eval(cpustate); + case 20: /* TRAnsfer */ + PC = MAR & 0017777; + cpustate->cycle = 0; /* instruction only takes one cycle if branch + is taken */ + break; + + case 22: /* Transfer on external LeVel */ + /*if (...) + { + PC = MAR & 0017777; + cpustate->cycle = 0;*/ /* instruction only takes one cycle if branch + is taken */ + /*}*/ + break; + + case 24: /* OPeRate */ + case 25: + case 26: + case 27: + case 28: + case 29: + case 30: + case 31: + if (((IR & 001) == 00) && ((MAR & 017000) == 004000)) + { /* Select class instruction */ + if (IR & 004) + /* (0.8???) CLA = CLear Ac */ + AC = 0; + + /* (IOS???) SEL = SELect */ + if (cpustate->iface->sel_handler) + (*cpustate->iface->sel_handler)(device); + } + else + { /* Normal operate class instruction */ + if (((IR & 001) == 01) && ((MAR & 017000) == 011000)) + /* (0.6) CLL = CLear Left 9 bits of ac */ + AC &= 0000777; + + if (((IR & 001) == 01) && ((MAR & 017000) == 012000)) + /* (0.6) CLR = CLear Right 9 bits of ac */ + AC &= 0777000; + + if (IR & 002) + /* (0.7) AMB = transfer Ac to MBr */ + MBR = AC; + + if (IR & 004) + /* (0.8) CLA = CLear Ac */ + AC = 0; + + if (((IR & 001) == 01) && ((MAR & 010000) == 000000)) + { /* (IOS) In-Out group commands */ + /* ((MAR & 0007000) >> 9) is device ID */ + /* 0: */ + /* (***) CPY = CoPY synchronizes transmission of information + between in-out equipment and computer. */ + /* 1: */ + /* (IOS) R1L = Read 1 Line of tape from PETR into AC bits 0, 3, + 6, 9, 12, 15, with CYR before read (inclusive or) */ + /* 3: */ + /* (IOS) R3L = Read 3 Lines of tape from PETR into AC bits 0, + 3, 6, 9, 12, 15, with CYR before each read (inclusive or) */ + /* 2: */ + /* (IOS) DIS = DISplay a point on scope (AC bits 0-8 specify x + coordinate, AC bits 9-17 specify y coordinate). The + coordinate (0, 0) is usually at the lower left hand corner + of the scope. A console switch is available to relocate + (0,0) to the center. */ + /* 6: */ + /* (IOS) P6H = Punch one 6-bit line of flexo tape (without 7th + hole) from ac bits 2, 5, 8, 11, 14, 17. Note: lines + without 7th hole are ignored by PETR. */ + /* 7: */ + /* (IOS) P7H = same as P6H, but with 7th hole */ + /* 4: */ + /* (IOS) PRT = Print one six bit flexo character from AC bits + 2, 5, 8, 11, 14, 17. */ + /* (5 is undefined) */ + int index = (MAR & 0007000) >> 9; + + if (cpustate->iface->io_handlers[index]) + (*cpustate->iface->io_handlers[index])(device); + cpustate->ioh = 1; + } + + if (((IR & 001) == 00) && ((MAR & 010000) == 010000)) + { /* (IOS) EX0 through EX7 = operate user's EXternal equipment. */ + switch ((MAR & 0007000) >> 9) + { + /* ... */ + } + } + } + break; + } + } + else + { + if (((IR != 2) && (IR != 3)) || (cpustate->cycle == 2)) + cpustate->cycle = 0; + else + cpustate->cycle = 2; /* SXA and ADO have an extra cycle 2 */ + switch (IR) + { + case 1: /* STore indeXed */ + indexed_address_eval(cpustate); + case 0: /* STOre */ + tx0_write(cpustate, MAR, (MBR = AC)); + break; + + case 2: /* Store indeX in Address */ + if (cpustate->cycle) + { /* cycle 1 */ + MBR = tx0_read(cpustate, MAR); + MBR = (MBR & 0760000) | (XR & 0017777); + } + else + { /* cycle 2 */ + tx0_write(cpustate, MAR, MBR); + } + break; + + case 3: /* ADd One */ + if (cpustate->cycle) + { /* cycle 1 */ + AC = tx0_read(cpustate, MAR) + 1; + + #if 0 + AC = (AC + (AC >> 18)) & 0777777; /* propagate carry around */ + if (AC == 0777777) /* check for -0 (right???) */ + AC = 0; + #else + if (AC >= 0777777) + AC = (AC + 1) & 0777777; + #endif + } + else + { /* cycle 2 */ + tx0_write(cpustate, MAR, (MBR = AC)); + } + break; + + case 5: /* Store Lr indeXed */ + indexed_address_eval(cpustate); + case 4: /* Store LR */ + tx0_write(cpustate, MAR, (MBR = LR)); + break; + + case 6: /* STore Zero */ + tx0_write(cpustate, MAR, (MBR = 0)); + break; + + case 9: /* ADd indeXed */ + indexed_address_eval(cpustate); + case 8: /* ADD */ + MBR = tx0_read(cpustate, MAR); + + AC = AC + MBR; + AC = (AC + (AC >> 18)) & 0777777; /* propagate carry around */ + + if (AC == 0777777) /* check for -0 */ + AC = 0; + break; + + case 10: /* LoaD indeX */ + MBR = tx0_read(cpustate, MAR); + XR = (MBR & 0017777) | ((MBR >> 4) & 0020000); + break; + + case 11: /* AUgment indeX */ + MBR = tx0_read(cpustate, MAR); + + XR = XR + ((MBR & 0017777) | ((MBR >> 4) & 0020000)); + XR = (XR + (XR >> 14)) & 0037777; /* propagate carry around */ + + //if (XR == 0037777) /* check for -0 */ + // XR = 0; + break; + + case 13: /* Load Lr indeXed */ + indexed_address_eval(cpustate); + case 12: /* Load LR */ + LR = MBR = tx0_read(cpustate, MAR); + break; + + case 15: /* Load Ac indeXed */ + indexed_address_eval(cpustate); + case 14: /* LoaD Ac */ + AC = MBR = tx0_read(cpustate, MAR); + break; + + case 16: /* TRansfer on Negative */ + case 17: /* Transfer on ZEro */ + case 18: /* Transfer and Set indeX */ + case 19: /* Transfer and IndeX */ + case 20: /* TRAnsfer */ + case 21: /* TRansfer indeXed */ + case 22: /* Transfer on external LeVel */ + break; + + case 24: /* OPeRate */ + case 25: + case 26: + case 27: + case 28: + case 29: + case 30: + case 31: + if (((IR & 001) == 00) && ((MAR & 017000) == 004000)) + { /* Select class instruction */ + } + else + { /* Normal operate class instruction */ + if (((IR & 001) == 00) && ((MAR & 017000) == 003000)) + { /* (1.1) PEN = set ac bit 0 from light PEN ff, and ac bit 1 from + light gun ff. (ffs contain one if pen or gun saw displayed + point.) Then clear both light pen and light gun ffs */ + /*AC = (AC & 0177777) |?...;*/ + /*... = 0;*/ + } + + if (((IR & 001) == 00) && ((MAR & 017000) == 001000)) + /* (1.1) TAC = transfer TAC into ac (inclusive or) */ + AC |= cpustate->tac; + + if (((IR & 001) == 00) && ((MAR & 017000) == 002000)) + /* (1.2) TBR = transfer TBR into mbr (inclusive or) */ + MBR |= cpustate->tbr; + + if (((IR & 001) == 00) && ((MAR & 017000) == 006000)) + /* (1.2) RPF = Read Program Flag register into mbr (inclusive or) */ + MBR |= PF << 8; + + if (MAR & 0000040) + /* (1.2) COM = COMplement ac */ + AC ^= 0777777; + + if ((! (MAR & 0000400)) && (MAR & 0000100)) + { /* (1.2) XMB = Transfer XR contents to MBR */ + MBR = XR; + if (XR & 0020000) + MBR |= 0740000; + } + + if (MAR & 0000004) + { + switch (MAR & 0000003) + { + case 0000003: /* (1.2) And LR and MBR */ + MBR &= LR; + break; + + case 0000001: /* (1.3) Or LR into MBR */ + MBR |= LR; + break; + + default: + if (LOG) + logerror("unrecognized instruction"); + break; + } + } + + if (((! (MAR & 0000400)) && (MAR & 0000200)) && ((! (MAR & 0000004)) && (MAR & 0000002))) + { /* LMB and MBL used simultaneously interchange LR and MBR */ + int tmp = MBR; + MBR = LR; + LR = tmp; + } + else if ((! (MAR & 0000400)) && (MAR & 0000200)) + /* (1.4) MBL = Transfer MBR contents to LR */ + LR = MBR; + else if ((! (MAR & 0000004)) && (MAR & 0000002)) + /* (1.4) LMB = Store the contents of the LR in the MBR. */ + MBR = LR; + + if (MAR & 0000020) + /* (1.5) PAD = Partial ADd mbr to ac */ + AC ^= MBR; + + if (MAR & 0000400) + { + switch (MAR & 0000300) + { + case 0000000: /* (1.6) CYR = CYcle ac contents Right one binary + position (AC(17) -> AC(0)) */ + AC = (AC >> 1) | ((AC & 1) << 17); + break; + + case 0000200: /* (1.6) CYcle ac contents Right one binary + position (AC(0) unchanged) */ + AC = (AC >> 1) | (AC & 0400000); + break; + + default: + if (LOG) + logerror("unrecognized instruction"); + break; + } + } + + if (((IR & 001) == 00) && ((MAR & 017000) == 007000)) + /* (1.6) SPF = Set Program Flag register from mbr */ + PF = (MBR >> 8) & 077; + + if (MAR & 0000010) + { /* (1.7?) CRY = Partial ADd the 18 digits of the AC to the + corresponding 18 digits of the carry. */ + AC ^= MBR; + + AC = AC + MBR; + AC = (AC + (AC >> 18)) & 0777777; /* propagate carry around */ + + if (AC == 0777777) /* check for -0 */ + AC = 0; + } + + if ((! (MAR & 0000004)) && (MAR & 0000001)) + /* (1.8) MBX = Transfer MBR contents to XR */ + XR = (MBR & 0017777) | ((MBR >> 4) & 0020000); + + if (((IR & 001) == 01) && ((MAR & 017000) == 010000)) + /* (1.8) HLT = HaLT the computer and sound chime */ + cpustate->run = 0; + } + break; + + default: /* Illegal */ + /* ... */ + break; + } + } +} + +/* + Simulate a pulse on reset line: + reset most registers and flip-flops, and initialize a few emulator state + variables. +*/ +static void pulse_reset(device_t *device) +{ + tx0_state *cpustate = get_safe_token(device); + + /* processor registers */ + PC = 0; /* ??? */ + IR = 0; /* ??? */ + /*MBR = 0;*/ /* ??? */ + /*MAR = 0;*/ /* ??? */ + /*AC = 0;*/ /* ??? */ + /*LR = 0;*/ /* ??? */ + + /* processor state flip-flops */ + cpustate->run = 0; /* ??? */ + cpustate->rim = 0; /* ??? */ + cpustate->ioh = 0; /* ??? */ + cpustate->ios = 0; /* ??? */ + + cpustate->rim_step = 0; + + /* now, we kindly ask IO devices to reset, too */ + if (cpustate->iface->io_reset_callback) + (*cpustate->iface->io_reset_callback)(device); +} + +DEFINE_LEGACY_CPU_DEVICE(TX0_64KW, tx0_64kw); +DEFINE_LEGACY_CPU_DEVICE(TX0_8KW, tx0_8kw); |