// license:LGPL-2.1+ // copyright-holders:Michael Zapf /* ti990/4 driver We emulate a basic ti990/4 board, with a FD800 disk controller and an 733 ASR terminal. A little floppy-based software for this computer is available thanks to efforts by Dave Pitts: mostly, Forth and TX990. Board setup options: 8kb of DRAM (onboard option, with optional parity): base 0x0000 or 0x2000 4 banks of 512 bytes of ROM or SRAM: base 0x0000, 0x0800, 0xF000 or 0xF800 power-up vector: 0x0000 (level 0) or 0xFFFC (load) optional memerr interrupt (level 2) optional power fail interrupt (level 1) optional real-time clock interrupt (level 5 or 7) Setup for the emulated system: 0x0000: 8kb on-board DRAM + 24kb extension RAM (total 32kb) 0xF800: 512 bytes SRAM 0xFA00: 512 bytes SRAM (or empty?) 0xFC00: 512 bytes self-test ROM 0xFE00: 512 bytes loader ROM power-up vector: 0xFFFC (load) Note that only interrupt levels 3-7 are supported by the board (8-15 are not wired). TODO: * finish ASR emulation * programmer panel * emulate other devices: card reader, printer Original implementation: Raphael Nabet Rewritten by Michael Zapf 2014 */ #include "emu.h" #include "cpu/tms9900/tms9900.h" #include "video/911_vdt.h" #include "sound/beep.h" #include "video/733_asr.h" #include "bus/ti99x/990_dk.h" class ti990_4_state : public driver_device { public: ti990_4_state(const machine_config &mconfig, device_type type, const char *tag) : driver_device(mconfig, type, tag), m_maincpu(*this, "maincpu"), m_fd800(*this, "fd800") { } DECLARE_READ8_MEMBER( panel_read ); DECLARE_WRITE8_MEMBER( panel_write ); DECLARE_WRITE8_MEMBER( external_operation ); DECLARE_READ8_MEMBER( interrupt_level ); DECLARE_WRITE_LINE_MEMBER( fd_interrupt ); DECLARE_WRITE_LINE_MEMBER( asrkey_interrupt ); DECLARE_WRITE_LINE_MEMBER( vdtkey_interrupt ); DECLARE_WRITE_LINE_MEMBER( line_interrupt ); DECLARE_DRIVER_INIT(ti990_4); DECLARE_DRIVER_INIT(ti990_4v); DECLARE_MACHINE_RESET(ti990_4); private: void hold_load(); void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr); int m_intlines; int m_int_level; emu_timer* m_nmi_timer; void reset_int_lines(); void set_int_line(int line, int state); bool m_ckon_state; // Connected devices required_device m_maincpu; required_device m_fd800; }; enum { NMI_TIMER_ID = 1 }; void ti990_4_state::hold_load() { m_maincpu->set_input_line(INT_9900_LOAD, ASSERT_LINE); logerror("ti990_4: Triggering LOAD interrupt\n"); m_nmi_timer->adjust(attotime::from_msec(100)); } /* LOAD interrupt trigger callback */ void ti990_4_state::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) { m_maincpu->set_input_line(INT_9900_LOAD, CLEAR_LINE); logerror("ti990_4: Released LOAD interrupt\n"); } READ8_MEMBER( ti990_4_state::panel_read ) { if (offset == 1) return 0x48; return 0; } WRITE8_MEMBER( ti990_4_state::panel_write ) { logerror("ti990_4: writing to panel @CRU %04x: %02x\n", offset<<1, data); } void ti990_4_state::set_int_line(int line, int state) { if (state) m_intlines |= (1 << line); else m_intlines &= ~(1 << line); if (m_intlines != 0) { m_int_level = 0; while ((m_intlines & (1 << m_int_level))==0) m_int_level++; logerror("ti990_4: Setting int level to %x\n", m_int_level); m_maincpu->set_input_line(INT_9900_INTREQ, ASSERT_LINE); } else m_maincpu->set_input_line(INT_9900_INTREQ, CLEAR_LINE); } void ti990_4_state::reset_int_lines() { m_intlines = 0; } /* Callback from the floppy controller. */ WRITE_LINE_MEMBER(ti990_4_state::fd_interrupt) { set_int_line(7, state); } /* Connection to VDT */ WRITE_LINE_MEMBER(ti990_4_state::vdtkey_interrupt) { set_int_line(3, state); } WRITE_LINE_MEMBER(ti990_4_state::line_interrupt) { if (m_ckon_state) set_int_line(5, state); } /* Callback from the terminal. */ WRITE_LINE_MEMBER(ti990_4_state::asrkey_interrupt) { set_int_line(6, state); } WRITE8_MEMBER( ti990_4_state::external_operation ) { static const char* extop[8] = { "inv1", "inv2", "IDLE", "RSET", "inv3", "CKON", "CKOF", "LREX" }; switch (offset) { case IDLE_OP: return; case RSET_OP: m_ckon_state = false; // clear controller panel and smi fault LEDs break; case CKON_OP: m_ckon_state = true; break; case CKOF_OP: m_ckon_state = false; set_int_line(5, 0); break; case LREX_OP: // TODO: Verify this hold_load(); break; default: logerror("ti99_4x: External operation %s not implemented on TI-990/4 board\n", extop[offset]); } } READ8_MEMBER( ti990_4_state::interrupt_level ) { return m_int_level; } /* Memory map - see description above */ static ADDRESS_MAP_START(memmap, AS_PROGRAM, 16, ti990_4_state ) AM_RANGE(0x0000, 0x7fff) AM_RAM /* dynamic RAM */ AM_RANGE(0x8000, 0xf7ff) AM_NOP /* reserved for expansion */ AM_RANGE(0xf800, 0xfbff) AM_RAM /* static RAM? */ AM_RANGE(0xfc00, 0xffff) AM_ROM /* LOAD ROM */ ADDRESS_MAP_END /* CRU map 0x000-0xF7F: user devices 0xF80-0xF9F: CRU interrupt + expansion control 0xFA0-0xFAF: TILINE coupler interrupt control 0xFB0-0xFCF: reserved 0xFD0-0xFDF: memory mapping and memory protect 0xFE0-0xFEF: internal interrupt control 0xFF0-0xFFF: front panel Default user map: 0x000-0x00f: 733 ASR (int 6) 0x010-0x01f: PROM programmer (wired to int 15, unused) 0x020-0x02f: 804 card reader (int 4) 0x030-0x03f: line printer (wired to int 14, unused) 0x040-0x05f: FD800 floppy controller (int 7) 0x060-0x07f: VDT1 (int 3 - wired to int 11, unused) 0x080-0x09f: VDT2, or CRU expansion (int ??? - wired to int 10, unused) 0x0a0-0x0bf: VDT3 (int ??? - wired to int 9, unused) */ static ADDRESS_MAP_START(cru_map, AS_IO, 8, ti990_4_state ) AM_RANGE(0x00, 0x01) AM_DEVREAD("asr733", asr733_device, cru_r) AM_RANGE(0x00, 0x0f) AM_DEVWRITE("asr733", asr733_device, cru_w) AM_RANGE(0x08, 0x0b) AM_DEVREAD( "fd800", fd800_legacy_device, cru_r ) AM_RANGE(0x40, 0x5f) AM_DEVWRITE( "fd800", fd800_legacy_device, cru_w ) AM_RANGE(0x1fe, 0x1ff) AM_READ( panel_read ) AM_RANGE(0xff0, 0xfff) AM_WRITE( panel_write ) ADDRESS_MAP_END static ADDRESS_MAP_START(cru_map_v, AS_IO, 8, ti990_4_state ) AM_RANGE(0x10, 0x11) AM_DEVREAD("vdt911", vdt911_device, cru_r) AM_RANGE(0x80, 0x8f) AM_DEVWRITE("vdt911", vdt911_device, cru_w) AM_RANGE(0x08, 0x0b) AM_DEVREAD( "fd800", fd800_legacy_device, cru_r ) AM_RANGE(0x40, 0x5f) AM_DEVWRITE( "fd800", fd800_legacy_device, cru_w ) AM_RANGE(0x1fe, 0x1ff) AM_READ( panel_read ) AM_RANGE(0xff0, 0xfff) AM_WRITE( panel_write ) ADDRESS_MAP_END /* static const floppy_interface ti990_4_floppy_interface = { FLOPPY_STANDARD_8_DSSD, LEGACY_FLOPPY_OPTIONS_NAME(fd800), NULL }; */ MACHINE_RESET_MEMBER(ti990_4_state,ti990_4) { hold_load(); reset_int_lines(); m_ckon_state = false; m_maincpu->set_ready(ASSERT_LINE); } DRIVER_INIT_MEMBER(ti990_4_state, ti990_4) { m_nmi_timer = timer_alloc(NMI_TIMER_ID); } static MACHINE_CONFIG_START( ti990_4, ti990_4_state ) /* basic machine hardware */ /* TMS9900 CPU @ 3.0(???) MHz */ MCFG_TMS99xx_ADD("maincpu", TMS9900, 3000000, memmap, cru_map) MCFG_TMS99xx_EXTOP_HANDLER( WRITE8(ti990_4_state, external_operation) ) MCFG_TMS99xx_INTLEVEL_HANDLER( READ8(ti990_4_state, interrupt_level) ) MCFG_MACHINE_RESET_OVERRIDE(ti990_4_state, ti990_4 ) // Terminal MCFG_DEVICE_ADD("asr733", ASR733, 0) MCFG_ASR733_KEYINT_HANDLER(WRITELINE(ti990_4_state, asrkey_interrupt)) MCFG_ASR733_LINEINT_HANDLER(WRITELINE(ti990_4_state, line_interrupt)) // Floppy controller MCFG_DEVICE_ADD("fd800", FD800, 0) MCFG_FD800_INT_HANDLER(WRITELINE(ti990_4_state, fd_interrupt)) // MCFG_LEGACY_FLOPPY_4_DRIVES_ADD(ti990_4_floppy_interface) MACHINE_CONFIG_END static MACHINE_CONFIG_START( ti990_4v, ti990_4_state ) /* basic machine hardware */ /* TMS9900 CPU @ 3.0(???) MHz */ MCFG_TMS99xx_ADD("maincpu", TMS9900, 3000000, memmap, cru_map_v) MCFG_TMS99xx_EXTOP_HANDLER( WRITE8(ti990_4_state, external_operation) ) MCFG_TMS99xx_INTLEVEL_HANDLER( READ8(ti990_4_state, interrupt_level) ) MCFG_MACHINE_RESET_OVERRIDE(ti990_4_state, ti990_4 ) // Terminal MCFG_DEVICE_ADD("vdt911", VDT911, 0) MCFG_VDT911_KEYINT_HANDLER(WRITELINE(ti990_4_state, vdtkey_interrupt)) MCFG_VDT911_LINEINT_HANDLER(WRITELINE(ti990_4_state, line_interrupt)) // Floppy controller MCFG_DEVICE_ADD("fd800", FD800, 0) MCFG_FD800_INT_HANDLER(WRITELINE(ti990_4_state, fd_interrupt)) // MCFG_LEGACY_FLOPPY_4_DRIVES_ADD(ti990_4_floppy_interface) MACHINE_CONFIG_END /* ROM loading */ ROM_START(ti990_4) /*CPU memory space*/ ROM_REGION16_BE(0x10000, "maincpu",0) #if 0 /* ROM set 945121-5: "733 ASR ROM loader with self test (prototyping)" (cf 945401-9701 pp. 1-19) */ /* test ROM */ ROMX_LOAD("94519209.u39", 0xFC00, 0x100, CRC(0a0b0c42), ROM_NIBBLE | ROM_SHIFT_NIBBLE_HI | ROM_SKIP(1)) ROMX_LOAD("94519210.u55", 0xFC00, 0x100, CRC(d078af61), ROM_NIBBLE | ROM_SHIFT_NIBBLE_LO | ROM_SKIP(1)) ROMX_LOAD("94519211.u61", 0xFC01, 0x100, CRC(6cf7d4a0), ROM_NIBBLE | ROM_SHIFT_NIBBLE_HI | ROM_SKIP(1)) ROMX_LOAD("94519212.u78", 0xFC01, 0x100, CRC(d9522458), ROM_NIBBLE | ROM_SHIFT_NIBBLE_LO | ROM_SKIP(1)) /* LOAD ROM */ ROMX_LOAD("94519113.u3", 0xFE00, 0x100, CRC(8719b04e), ROM_NIBBLE | ROM_SHIFT_NIBBLE_HI | ROM_SKIP(1)) ROMX_LOAD("94519114.u4", 0xFE00, 0x100, CRC(72a040e0), ROM_NIBBLE | ROM_SHIFT_NIBBLE_LO | ROM_SKIP(1)) ROMX_LOAD("94519115.u6", 0xFE01, 0x100, CRC(9ccf8cca), ROM_NIBBLE | ROM_SHIFT_NIBBLE_HI | ROM_SKIP(1)) ROMX_LOAD("94519116.u7", 0xFE01, 0x100, CRC(fa387bf3), ROM_NIBBLE | ROM_SHIFT_NIBBLE_LO | ROM_SKIP(1)) #else /* ROM set 945121-4(?): "Floppy disc loader with self test" (cf 945401-9701 pp. 1-19) */ ROM_LOAD16_WORD("ti9904.rom", 0xFC00, 0x400, CRC(691e7d19) SHA1(58d9bed80490fdf71c743bfd3077c70840b7df8c)) #endif ROM_REGION(asr733_chr_region_len, asr733_chr_region, ROMREGION_ERASEFF) ROM_END ROM_START(ti990_4v) /*CPU memory space*/ ROM_REGION16_BE(0x10000, "maincpu",0) ROM_LOAD16_WORD("ti9904.rom", 0xFC00, 0x400, CRC(691e7d19) SHA1(58d9bed80490fdf71c743bfd3077c70840b7df8c)) /* VDT911 character definitions */ ROM_REGION(vdt911_chr_region_len, vdt911_chr_region, ROMREGION_ERASEFF) ROM_END /* YEAR NAME PARENT COMPAT MACHINE INPUT INIT COMPANY FULLNAME */ COMP( 1976, ti990_4, 0, 0, ti990_4, 0, ti990_4_state, ti990_4, "Texas Instruments", "TI Model 990/4 Microcomputer System" , MACHINE_NOT_WORKING | MACHINE_NO_SOUND ) COMP( 1976, ti990_4v, ti990_4, 0, ti990_4v, 0, ti990_4_state, ti990_4, "Texas Instruments", "TI Model 990/4 Microcomputer System with Video Display Terminal" , MACHINE_NOT_WORKING | MACHINE_NO_SOUND )