// license:MAME|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 "imagedev/flopdrv.h"
#include "machine/ti99/990_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<tms9900_device> m_maincpu;
required_device<fd800_legacy_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" , GAME_NOT_WORKING | GAME_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" , GAME_NOT_WORKING | GAME_NO_SOUND )