diff options
Diffstat (limited to 'src/devices/cpu/tms1000/tms1000c.cpp')
-rw-r--r-- | src/devices/cpu/tms1000/tms1000c.cpp | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/src/devices/cpu/tms1000/tms1000c.cpp b/src/devices/cpu/tms1000/tms1000c.cpp new file mode 100644 index 00000000000..f6287012d16 --- /dev/null +++ b/src/devices/cpu/tms1000/tms1000c.cpp @@ -0,0 +1,66 @@ +// license:BSD-3-Clause +// copyright-holders:hap +/* + + TMS1000 family - TMS1000C + + TODO: + - add TMS1200C (has L input pins like TMS1600) + +*/ + +#include "emu.h" +#include "tms1000c.h" + +// TMS1000 CMOS versions (3-level stack, HALT pin) +// - RAM at top-left, ROM at top-right(rotate CCW) +// - ROM ordering is different: +// * row select is linear (0-63) +// * bit select is 7-0 instead of 0-7 +// * page select doesn't flip in the middle +// - 32-term mpla at bottom-right, different order +// - 32-term opla at bottom-left, ordered O7-O0(0 or 1), and A8,4,2,1,S +DEFINE_DEVICE_TYPE(TMS1000C, tms1000c_cpu_device, "tms1000c", "TMS1000C") // 28-pin SDIP, 10 R pins + + +// internal memory maps +static ADDRESS_MAP_START(program_10bit_8, AS_PROGRAM, 8, tms1k_base_device) + AM_RANGE(0x000, 0x3ff) AM_ROM +ADDRESS_MAP_END + +static ADDRESS_MAP_START(data_64x4, AS_DATA, 8, tms1k_base_device) + AM_RANGE(0x00, 0x3f) AM_RAM +ADDRESS_MAP_END + + +// device definitions +tms1000c_cpu_device::tms1000c_cpu_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) + : tms1000_cpu_device(mconfig, TMS1000C, tag, owner, clock, 8 /* o pins */, 10 /* r pins */, 6 /* pc bits */, 8 /* byte width */, 2 /* x width */, 10 /* prg width */, ADDRESS_MAP_NAME(program_10bit_8), 6 /* data width */, ADDRESS_MAP_NAME(data_64x4)) +{ +} + + +// machine configs +MACHINE_CONFIG_MEMBER(tms1000c_cpu_device::device_add_mconfig) + + // microinstructions PLA, output PLA + MCFG_PLA_ADD("mpla", 8, 16, 32) + MCFG_PLA_FILEFORMAT(BERKELEY) + MCFG_PLA_ADD("opla", 5, 8, 32) + MCFG_PLA_FILEFORMAT(BERKELEY) +MACHINE_CONFIG_END + + +// microinstructions decode (different order, no active-negative) +u32 tms1000c_cpu_device::decode_micro(u8 sel) +{ + const u32 md[16] = { M_AUTY, M_AUTA, M_STSL, M_NE, M_C8, M_CIN, M_CKP, M_YTP, M_MTP, M_NATN, M_CKN, M_MTN, M_ATN, M_15TN, M_CKM, M_STO }; + u16 mask = m_mpla->read(sel); + u32 decode = 0; + + for (int bit = 0; bit < 16; bit++) + if (mask & (1 << bit)) + decode |= md[bit]; + + return decode; +} |