diff options
Diffstat (limited to 'src/devices/cpu/tms1000/tms1400.cpp')
-rw-r--r-- | src/devices/cpu/tms1000/tms1400.cpp | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/src/devices/cpu/tms1000/tms1400.cpp b/src/devices/cpu/tms1000/tms1400.cpp new file mode 100644 index 00000000000..f1bada9c6c9 --- /dev/null +++ b/src/devices/cpu/tms1000/tms1400.cpp @@ -0,0 +1,143 @@ +// license:BSD-3-Clause +// copyright-holders:Wilbert Pol, hap +/* + + TMS1000 family - TMS1400, TMS1470, TMS1600, TMS1670 + + TODO: + - emulate TMS1600 L-pins + +*/ + +#include "tms1400.h" +#include "debugger.h" + +// TMS1400 follows the TMS1100, it doubles the ROM size again (4 chapters of 16 pages), and adds a 3-level callstack +// - rotate the view and mirror the OR-mask to get the proper layout of the mpla, the default is identical to tms1100 +// - the opla size is increased from 20 to 32 terms +const device_type TMS1400 = &device_creator<tms1400_cpu_device>; // 28-pin DIP, 11 R pins (TMS1400CR is same, but with TMS1100 pinout) +const device_type TMS1470 = &device_creator<tms1470_cpu_device>; // high voltage version, 1 R pin removed for Vdd + +// TMS1600 adds more I/O to the TMS1400, input pins are doubled with added L1,2,4,8 +// - rotate the view and mirror the OR-mask to get the proper layout of the mpla, the default is identical to tms1100 +// - the opla size is increased from 20 to 32 terms +const device_type TMS1600 = &device_creator<tms1600_cpu_device>; // 40-pin DIP, 16 R pins +const device_type TMS1670 = &device_creator<tms1670_cpu_device>; // high voltage version + + +// internal memory maps +static ADDRESS_MAP_START(program_12bit_8, AS_PROGRAM, 8, tms1k_base_device) + AM_RANGE(0x000, 0xfff) AM_ROM +ADDRESS_MAP_END + +static ADDRESS_MAP_START(data_128x4, AS_DATA, 8, tms1k_base_device) + AM_RANGE(0x00, 0x7f) AM_RAM +ADDRESS_MAP_END + + +// device definitions +tms1400_cpu_device::tms1400_cpu_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) + : tms1100_cpu_device(mconfig, TMS1400, "TMS1400", tag, owner, clock, 8 /* o pins */, 11 /* r pins */, 6 /* pc bits */, 8 /* byte width */, 3 /* x width */, 12 /* prg width */, ADDRESS_MAP_NAME(program_12bit_8), 7 /* data width */, ADDRESS_MAP_NAME(data_128x4), "tms1400", __FILE__) +{ } + +tms1400_cpu_device::tms1400_cpu_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock, UINT8 o_pins, UINT8 r_pins, UINT8 pc_bits, UINT8 byte_bits, UINT8 x_bits, int prgwidth, address_map_constructor program, int datawidth, address_map_constructor data, const char *shortname, const char *source) + : tms1100_cpu_device(mconfig, type, name, tag, owner, clock, o_pins, r_pins, pc_bits, byte_bits, x_bits, prgwidth, program, datawidth, data, shortname, source) +{ } + +tms1470_cpu_device::tms1470_cpu_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) + : tms1400_cpu_device(mconfig, TMS1470, "TMS1470", tag, owner, clock, 8, 10, 6, 8, 3, 12, ADDRESS_MAP_NAME(program_12bit_8), 7, ADDRESS_MAP_NAME(data_128x4), "tms1470", __FILE__) +{ } + + +tms1600_cpu_device::tms1600_cpu_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) + : tms1400_cpu_device(mconfig, TMS1600, "TMS1600", tag, owner, clock, 8, 16, 6, 8, 3, 12, ADDRESS_MAP_NAME(program_12bit_8), 7, ADDRESS_MAP_NAME(data_128x4), "tms1600", __FILE__) +{ } + +tms1600_cpu_device::tms1600_cpu_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock, UINT8 o_pins, UINT8 r_pins, UINT8 pc_bits, UINT8 byte_bits, UINT8 x_bits, int prgwidth, address_map_constructor program, int datawidth, address_map_constructor data, const char *shortname, const char *source) + : tms1400_cpu_device(mconfig, type, name, tag, owner, clock, o_pins, r_pins, pc_bits, byte_bits, x_bits, prgwidth, program, datawidth, data, shortname, source) +{ } + +tms1670_cpu_device::tms1670_cpu_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) + : tms1600_cpu_device(mconfig, TMS1670, "TMS1670", tag, owner, clock, 8, 16, 6, 8, 3, 12, ADDRESS_MAP_NAME(program_12bit_8), 7, ADDRESS_MAP_NAME(data_128x4), "tms1670", __FILE__) +{ } + + +// machine configs +static MACHINE_CONFIG_FRAGMENT(tms1400) + + // microinstructions PLA, output PLA + MCFG_PLA_ADD("mpla", 8, 16, 30) + MCFG_PLA_FILEFORMAT(PLA_FMT_BERKELEY) + MCFG_PLA_ADD("opla", 5, 8, 32) + MCFG_PLA_FILEFORMAT(PLA_FMT_BERKELEY) +MACHINE_CONFIG_END + +machine_config_constructor tms1400_cpu_device::device_mconfig_additions() const +{ + return MACHINE_CONFIG_NAME(tms1400); +} + + +// device_reset +void tms1400_cpu_device::device_reset() +{ + tms1100_cpu_device::device_reset(); + + // small differences in 00-3f area + m_fixed_decode[0x0b] = F_TPC; +} + + +// opcode deviations +void tms1400_cpu_device::op_br() +{ + // BR/BL: conditional branch + if (m_status) + { + m_pa = m_pb; // don't care about clatch + m_ca = m_cb; + m_pc = m_opcode & m_pc_mask; + } +} + +void tms1400_cpu_device::op_call() +{ + // CALL/CALLL: conditional call + if (m_status) + { + // 3-level stack, mask clatch 3 bits (no need to mask others) + m_clatch = (m_clatch << 1 | 1) & 7; + + m_sr = m_sr << m_pc_bits | m_pc; + m_pc = m_opcode & m_pc_mask; + + m_ps = m_ps << 4 | m_pa; + m_pa = m_pb; + + m_cs = m_cs << 2 | m_ca; + m_ca = m_cb; + } + else + { + m_pb = m_pa; + m_cb = m_ca; + } +} + +void tms1400_cpu_device::op_retn() +{ + // RETN: return from subroutine + if (m_clatch & 1) + { + m_clatch >>= 1; + + m_pc = m_sr & m_pc_mask; + m_sr >>= m_pc_bits; + + m_pa = m_pb = m_ps & 0xf; + m_ps >>= 4; + + m_ca = m_cb = m_cs & 3; + m_cs >>= 2; + } +} |