diff options
Diffstat (limited to 'src/devices/cpu/pdp1/tx0.cpp')
-rw-r--r-- | src/devices/cpu/pdp1/tx0.cpp | 1087 |
1 files changed, 0 insertions, 1087 deletions
diff --git a/src/devices/cpu/pdp1/tx0.cpp b/src/devices/cpu/pdp1/tx0.cpp deleted file mode 100644 index 99636fcb9c2..00000000000 --- a/src/devices/cpu/pdp1/tx0.cpp +++ /dev/null @@ -1,1087 +0,0 @@ -// license:BSD-3-Clause -// copyright-holders:Raphael Nabet -/* - TX-0 emulator - - Two variants: - * initial model 64kWord RAM - * later model 8kWord RAM - - Raphael Nabet 2004 -*/ - -#include "emu.h" -#include "tx0.h" -#include "tx0dasm.h" -#include "debugger.h" - -#define LOG 0 -#define LOG_EXTRA 0 - - -#define READ_TX0_18BIT(A) ((signed)m_program->read_dword((A)<<2)) -#define WRITE_TX0_18BIT(A,V) (m_program->write_dword((A)<<2,(V))) - - -#define io_handler_rim 3 - -#define PC m_pc -#define IR m_ir -#define MBR m_mbr -#define MAR m_mar -#define AC m_ac -#define LR m_lr -#define XR m_xr -#define PF m_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) - - -DEFINE_DEVICE_TYPE(TX0_8KW, tx0_8kw_device, "tx0_8kw_cpu", "MIT Lincoln Laboratory TX-0 8KW") -DEFINE_DEVICE_TYPE(TX0_64KW, tx0_64kw_device, "tx0_64kw_cpu", "MIT Lincoln Laboratory TX-0 64KW") - - -tx0_device::tx0_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock, int addr_bits, int address_mask, int ir_mask) - : cpu_device(mconfig, type, tag, owner, clock) - , m_program_config("program", ENDIANNESS_BIG, 32, addr_bits , -2), m_mbr(0), m_ac(0), m_mar(0), m_pc(0), m_ir(0), m_lr(0), m_xr(0), m_pf(0), m_tbr(0), m_tac(0), m_cm_sel(0) - , m_lr_sel(0), m_gbl_cm_sel(0), m_stop_cyc0(0), m_stop_cyc1(0), m_run(0), m_rim(0), m_cycle(0), m_ioh(0), m_ios(0), m_rim_step(0) - , m_address_mask(address_mask) - , m_ir_mask(ir_mask), m_icount(0), m_program(nullptr) - , m_cpy_handler(*this) - , m_r1l_handler(*this) - , m_dis_handler(*this) - , m_r3l_handler(*this) - , m_prt_handler(*this) - , m_rsv_handler(*this) - , m_p6h_handler(*this) - , m_p7h_handler(*this) - , m_sel_handler(*this) - , m_io_reset_callback(*this) -{ - m_program_config.m_is_octal = true; -} - -tx0_8kw_device::tx0_8kw_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) - : tx0_device(mconfig, TX0_8KW, tag, owner, clock, 13, ADDRESS_MASK_8KW, 037) -{ -} - - -tx0_64kw_device::tx0_64kw_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) - : tx0_device(mconfig, TX0_64KW, tag, owner, clock, 16, ADDRESS_MASK_64KW, 03) -{ -} - -device_memory_interface::space_config_vector tx0_device::memory_space_config() const -{ - return space_config_vector { - std::make_pair(AS_PROGRAM, &m_program_config) - }; -} - - -int tx0_device::tx0_read(offs_t address) -{ - if ((address >= 16) || (m_gbl_cm_sel) || ((m_cm_sel >> address) & 1)) - /* core memory (CM) */ - return READ_TX0_18BIT(address); - else if ((m_lr_sel >> address) & 1) - /* live register (LR) */ - return LR; - - /* toggle switch storage (TSS) */ - return m_tss[address]; -} - -void tx0_device::tx0_write(offs_t address, int data) -{ - if ((address >= 16) || (m_gbl_cm_sel) || ((m_cm_sel >> address) & 1)) - /* core memory (CM) */ - WRITE_TX0_18BIT(address, data); - else if ((m_lr_sel >> address) & 1) - /* live register (LR) */ - LR = data; - else - /* toggle switch storage (TSS) */ - /* TSS is read-only */ - { - /* nothing */ - } -} - - -void tx0_device::device_start() -{ - m_mbr = 0; - m_ac = 0; - m_mar = 0; - m_lr = 0; - m_xr = 0; - m_pf = 0; - m_tbr = 0; - m_tac = 0; - for (auto & elem : m_tss) - { - elem = 0; - } - m_cm_sel = 0; - m_lr_sel = 0; - m_gbl_cm_sel = 0; - m_stop_cyc0 = 0; - m_stop_cyc1 = 0; - m_cycle = 0; - m_pc = 0; - m_ir = 0; - m_run = 0; - m_rim = 0; - m_ioh = 0; - m_ios = 0; - - // Resolve callbacks - m_cpy_handler.resolve(); - m_r1l_handler.resolve(); - m_dis_handler.resolve(); - m_r3l_handler.resolve(); - m_prt_handler.resolve(); - m_rsv_handler.resolve(); - m_p6h_handler.resolve(); - m_p7h_handler.resolve(); - m_sel_handler.resolve(); - m_io_reset_callback.resolve(); - - m_program = &space(AS_PROGRAM); - - save_item(NAME(m_mbr)); - save_item(NAME(m_ac)); - save_item(NAME(m_mar)); - save_item(NAME(m_pc)); - save_item(NAME(m_ir)); - save_item(NAME(m_lr)); - save_item(NAME(m_xr)); - save_item(NAME(m_pf)); - save_item(NAME(m_tbr)); - save_item(NAME(m_tac)); - save_item(NAME(m_tss)); - save_item(NAME(m_cm_sel)); - save_item(NAME(m_lr_sel)); - save_item(NAME(m_gbl_cm_sel)); - save_item(NAME(m_stop_cyc0)); - save_item(NAME(m_stop_cyc1)); - save_item(NAME(m_run)); - save_item(NAME(m_rim)); - save_item(NAME(m_cycle)); - save_item(NAME(m_ioh)); - save_item(NAME(m_ios)); - save_item(NAME(m_rim_step)); - - // Register state for debugger - state_add( TX0_PC, "PC", m_pc ).mask(m_address_mask).formatstr("0%06O"); - state_add( TX0_IR, "IR", m_ir ).mask(m_ir_mask) .formatstr("0%02O"); - state_add( TX0_MBR, "MBR", m_mbr ).mask(0777777) .formatstr("0%06O"); - state_add( TX0_MAR, "MAR", m_mar ).mask(m_address_mask).formatstr("0%06O"); - state_add( TX0_AC, "AC", m_ac ).mask(0777777) .formatstr("0%06O"); - state_add( TX0_LR, "LR", m_lr ).mask(0777777) .formatstr("0%06O"); - state_add( TX0_XR, "XR", m_xr ).mask(0037777) .formatstr("0%05O"); - state_add( TX0_PF, "PF", m_pf ).mask(077) .formatstr("0%02O"); - state_add( TX0_TBR, "TBR", m_tbr ).mask(0777777) .formatstr("0%06O"); - state_add( TX0_TAC, "TAC", m_tac ).mask(0777777) .formatstr("0%06O"); - state_add( TX0_TSS00, "TSS00", m_tss[000] ).mask(0777777) .formatstr("0%06O"); - state_add( TX0_TSS01, "TSS01", m_tss[001] ).mask(0777777) .formatstr("0%06O"); - state_add( TX0_TSS02, "TSS02", m_tss[002] ).mask(0777777) .formatstr("0%06O"); - state_add( TX0_TSS03, "TSS03", m_tss[003] ).mask(0777777) .formatstr("0%06O"); - state_add( TX0_TSS04, "TSS04", m_tss[004] ).mask(0777777) .formatstr("0%06O"); - state_add( TX0_TSS05, "TSS05", m_tss[005] ).mask(0777777) .formatstr("0%06O"); - state_add( TX0_TSS06, "TSS06", m_tss[006] ).mask(0777777) .formatstr("0%06O"); - state_add( TX0_TSS07, "TSS07", m_tss[007] ).mask(0777777) .formatstr("0%06O"); - state_add( TX0_TSS10, "TSS10", m_tss[010] ).mask(0777777) .formatstr("0%06O"); - state_add( TX0_TSS11, "TSS11", m_tss[011] ).mask(0777777) .formatstr("0%06O"); - state_add( TX0_TSS12, "TSS12", m_tss[012] ).mask(0777777) .formatstr("0%06O"); - state_add( TX0_TSS13, "TSS13", m_tss[013] ).mask(0777777) .formatstr("0%06O"); - state_add( TX0_TSS14, "TSS14", m_tss[014] ).mask(0777777) .formatstr("0%06O"); - state_add( TX0_TSS15, "TSS15", m_tss[015] ).mask(0777777) .formatstr("0%06O"); - state_add( TX0_TSS16, "TSS16", m_tss[016] ).mask(0777777) .formatstr("0%06O"); - state_add( TX0_TSS17, "TSS17", m_tss[017] ).mask(0777777) .formatstr("0%06O"); - state_add( TX0_CM_SEL, "CMSEL", m_cm_sel ).mask(0177777) .formatstr("0%06O"); - state_add( TX0_LR_SEL, "LRSEL", m_lr_sel ).mask(0177777) .formatstr("0%06O"); - state_add( TX0_GBL_CM_SEL, "GBLCMSEL", m_gbl_cm_sel ).mask(1) .formatstr("%1X"); - state_add( TX0_STOP_CYC0, "STOPCYC0", m_stop_cyc0 ).mask(1) .formatstr("%1X"); - state_add( TX0_STOP_CYC1, "STOPCYC1", m_stop_cyc1 ).mask(1) .formatstr("%1X"); - state_add( TX0_RUN, "RUN", m_run ).mask(1) .formatstr("%1X"); - state_add( TX0_RIM, "RIM", m_rim ).mask(1) .formatstr("%1X"); - state_add( TX0_CYCLE, "CYCLE", m_cycle ) .formatstr("%1X"); - state_add( TX0_IOH, "IOH", m_ioh ) .formatstr("%1X"); - state_add( TX0_IOS, "IOS", m_ios ).mask(1) .formatstr("%1X"); - - state_add(STATE_GENPC, "GENPC", m_pc).formatstr("0%06O").noshow(); - state_add(STATE_GENPCBASE, "CURPC", m_pc).formatstr("0%06O").noshow(); - state_add(STATE_GENFLAGS, "GENFLAGS", m_ir).noshow(); - - set_icountptr(m_icount); -} - - -void tx0_device::device_reset() -{ - /* reset CPU flip-flops */ - pulse_reset(); - - m_gbl_cm_sel = 1; /* HACK */ -} - - -void tx0_device::call_io_handler(int io_handler) -{ - /* data will be transferred to AC */ - switch (io_handler) - { - case 0: m_cpy_handler(ASSERT_LINE); break; - case 1: m_r1l_handler(ASSERT_LINE); break; - case 2: m_dis_handler(ASSERT_LINE); break; - case 3: m_r3l_handler(ASSERT_LINE); break; - case 4: m_prt_handler(ASSERT_LINE); break; - case 5: m_rsv_handler(ASSERT_LINE); break; - case 6: m_p6h_handler(ASSERT_LINE); break; - case 7: m_p7h_handler(ASSERT_LINE); break; - } -} - - -/* execute instructions on this CPU until icount expires */ -void tx0_64kw_device::execute_run() -{ - do - { - debugger_instruction_hook(PC); - - - if (m_ioh && m_ios) - { - m_ioh = 0; - } - - - if ((! m_run) && (! m_rim)) - m_icount = 0; /* if processor is stopped, just burn cycles */ - else if (m_rim) - { - switch (m_rim_step) - { - case 0: - /* read first word as instruction */ - AC = 0; - call_io_handler(io_handler_rim); - m_rim_step = 1; - m_ios = 0; - break; - - case 1: - if (! m_ios) - { /* transfer incomplete: wait some more */ - m_icount = 0; - } - else - { /* data transfer complete */ - m_ios = 0; - - MBR = AC; - IR = MBR >> 16; /* basic opcode */ - if ((IR == 2) || (IR == 1)) /* trn or add instruction? */ - { - PC = MBR & ADDRESS_MASK_64KW; - m_rim = 0; /* exit read-in mode */ - m_run = (IR == 2) ? 1 : 0; /* stop if add instruction */ - m_rim_step = 0; - } - else if ((IR == 0) || (IR == 3)) /* sto or opr instruction? */ - { - MAR = MBR & ADDRESS_MASK_64KW; - m_rim_step = 2; - } - } - break; - - case 2: - /* read second word as data */ - AC = 0; - call_io_handler(io_handler_rim); - m_rim_step = 3; - m_ios = 0; - break; - - case 3: - if (! m_ios) - { /* transfer incomplete: wait some more */ - m_icount = 0; - } - else - { /* data transfer complete */ - m_ios = 0; - - tx0_write(MAR, MBR = AC); - - m_rim_step = 0; - } - break; - } - } - else - { - if (m_cycle == 0) - { /* fetch new instruction */ - MBR = tx0_read(MAR = PC); - INCREMENT_PC_64KW; - IR = MBR >> 16; /* basic opcode */ - MAR = MBR & ADDRESS_MASK_64KW; - } - - if (! m_ioh) - { - if ((m_stop_cyc0 && (m_cycle == 0)) - || (m_stop_cyc1 && (m_cycle == 1))) - m_run = 0; - - execute_instruction_64kw(); - } - - m_icount --; - } - } - while (m_icount > 0); -} - -/* execute instructions on this CPU until icount expires */ -void tx0_8kw_device::execute_run() -{ - do - { - debugger_instruction_hook(PC); - - - if (m_ioh && m_ios) - { - m_ioh = 0; - } - - - if ((! m_run) && (! m_rim)) - m_icount = 0; /* if processor is stopped, just burn cycles */ - else if (m_rim) - { - switch (m_rim_step) - { - case 0: - /* read first word as instruction */ - AC = 0; - call_io_handler(io_handler_rim); - m_rim_step = 1; - m_ios = 0; - break; - - case 1: - if (! m_ios) - { /* transfer incomplete: wait some more */ - m_icount = 0; - } - else - { /* data transfer complete */ - m_ios = 0; - - MBR = AC; - IR = MBR >> 13; /* basic opcode */ - if ((IR == 16) || (IR == 8)) /* trn or add instruction? */ - { - PC = MBR & ADDRESS_MASK_8KW; - m_rim = 0; /* exit read-in mode */ - m_run = (IR == 16) ? 1 : 0; /* stop if add instruction */ - m_rim_step = 0; - } - else if ((IR == 0) || (IR == 24)) /* sto or opr instruction? */ - { - MAR = MBR & ADDRESS_MASK_8KW; - m_rim_step = 2; - } - } - break; - - case 2: - /* read second word as data */ - AC = 0; - call_io_handler(io_handler_rim); - m_rim_step = 3; - m_ios = 0; - break; - - case 3: - if (! m_ios) - { /* transfer incomplete: wait some more */ - m_icount = 0; - } - else - { /* data transfer complete */ - m_ios = 0; - - tx0_write(MAR, MBR = AC); - - m_rim_step = 0; - } - break; - } - } - else - { - if (m_cycle == 0) - { /* fetch new instruction */ - MBR = tx0_read(MAR = PC); - INCREMENT_PC_8KW; - IR = MBR >> 13; /* basic opcode */ - MAR = MBR & ADDRESS_MASK_8KW; - } - - if (! m_ioh) - { - if ((m_stop_cyc0 && (m_cycle == 0)) - || (m_stop_cyc1 && (m_cycle == 1))) - m_run = 0; - - execute_instruction_8kw(); - } - - m_icount -= 1; - } - } - while (m_icount > 0); -} - - -/* execute one instruction */ -void tx0_64kw_device::execute_instruction_64kw() -{ - if (! m_cycle) - { - m_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; - m_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 */ - m_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; - - call_io_handler(index); - m_ioh = 1; - } - break; - } - } - else - { - m_cycle = 0; /* always true */ - switch (IR) - { - case 0: /* STOre */ - tx0_write(MAR, (MBR = AC)); - break; - - case 1: /* ADD */ - MBR = tx0_read(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 */ - m_run = 0; - - break; - } - } -} - -void tx0_device::indexed_address_eval() -{ - 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 */ -void tx0_8kw_device::execute_instruction_8kw() -{ - if (! m_cycle) - { - m_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; - m_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; - m_cycle = 0; /* instruction only takes one cycle if branch - is taken */ - } - break; - - case 18: /* Transfer and Set indeX */ - XR = PC; - PC = MAR & 0017777; - m_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; - m_cycle = 0; /* instruction only takes one cycle if branch - is taken */ - } - break; - - case 21: /* TRansfer indeXed */ - indexed_address_eval(); - case 20: /* TRAnsfer */ - PC = MAR & 0017777; - m_cycle = 0; /* instruction only takes one cycle if branch - is taken */ - break; - - case 22: /* Transfer on external LeVel */ - /*if (...) - { - PC = MAR & 0017777; - m_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 */ - m_sel_handler(ASSERT_LINE); - } - 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; - - call_io_handler(index); - m_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)) || (m_cycle == 2)) - m_cycle = 0; - else - m_cycle = 2; /* SXA and ADO have an extra cycle 2 */ - switch (IR) - { - case 1: /* STore indeXed */ - indexed_address_eval(); - case 0: /* STOre */ - tx0_write(MAR, (MBR = AC)); - break; - - case 2: /* Store indeX in Address */ - if (m_cycle) - { /* cycle 1 */ - MBR = tx0_read(MAR); - MBR = (MBR & 0760000) | (XR & 0017777); - } - else - { /* cycle 2 */ - tx0_write(MAR, MBR); - } - break; - - case 3: /* ADd One */ - if (m_cycle) - { /* cycle 1 */ - AC = tx0_read(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(MAR, (MBR = AC)); - } - break; - - case 5: /* Store Lr indeXed */ - indexed_address_eval(); - case 4: /* Store LR */ - tx0_write(MAR, (MBR = LR)); - break; - - case 6: /* STore Zero */ - tx0_write(MAR, (MBR = 0)); - break; - - case 9: /* ADd indeXed */ - indexed_address_eval(); - case 8: /* ADD */ - MBR = tx0_read(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(MAR); - XR = (MBR & 0017777) | ((MBR >> 4) & 0020000); - break; - - case 11: /* AUgment indeX */ - MBR = tx0_read(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(); - case 12: /* Load LR */ - LR = MBR = tx0_read(MAR); - break; - - case 15: /* Load Ac indeXed */ - indexed_address_eval(); - case 14: /* LoaD Ac */ - AC = MBR = tx0_read(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 |= m_tac; - - if (((IR & 001) == 00) && ((MAR & 017000) == 002000)) - /* (1.2) TBR = transfer TBR into mbr (inclusive or) */ - MBR |= m_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 */ - m_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. -*/ -void tx0_device::pulse_reset() -{ - /* processor registers */ - PC = 0; /* ??? */ - IR = 0; /* ??? */ - /*MBR = 0;*/ /* ??? */ - /*MAR = 0;*/ /* ??? */ - /*AC = 0;*/ /* ??? */ - /*LR = 0;*/ /* ??? */ - - /* processor state flip-flops */ - m_run = 0; /* ??? */ - m_rim = 0; /* ??? */ - m_ioh = 0; /* ??? */ - m_ios = 0; /* ??? */ - - m_rim_step = 0; - - /* now, we kindly ask IO devices to reset, too */ - m_io_reset_callback(ASSERT_LINE); -} - -void tx0_device::io_complete() -{ - m_ios = 1; -} - - -std::unique_ptr<util::disasm_interface> tx0_8kw_device::create_disassembler() -{ - return std::make_unique<tx0_8kw_disassembler>(); -} - -std::unique_ptr<util::disasm_interface> tx0_64kw_device::create_disassembler() -{ - return std::make_unique<tx0_64kw_disassembler>(); -} |