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Diffstat (limited to 'src/mess/drivers/tec1.c')
-rw-r--r-- | src/mess/drivers/tec1.c | 427 |
1 files changed, 427 insertions, 0 deletions
diff --git a/src/mess/drivers/tec1.c b/src/mess/drivers/tec1.c new file mode 100644 index 00000000000..06795d161a8 --- /dev/null +++ b/src/mess/drivers/tec1.c @@ -0,0 +1,427 @@ +/*************************************************************************** + + TEC-1 driver, written by Robbbert in April, 2009 for MESS. + +The TEC-1 was a single-board "computer" described in Talking Electronics +magazine, issues number 10 and 11. Talking Electronics do not have dates on +their issues, so the date is uncertain, although 1984 seems a reasonable +guess. Talking Electronics operated from Cheltenham, a suburb of Melbourne. + +The hardware is quite simple, consisting of a Z80 cpu, 2x 8212 8-bit latch, +74C923 keyboard scanner, 20 push-button keys, 6-digit LED display, a speaker, +a 2k EPROM and sundry parts. + +The cpu speed could be adjusted by using a potentiometer, the range being +250 kHz to 2MHz. This is a simple method of adjusting a game's difficulty. + +We emulate the original version. Later enhancements included more RAM, speech +synthesis and various attachments, however I have no information on these. + +Pasting: + 0-F : as is + + (inc) : ^ + - (dec) : V + AD : - + GO : X + +Keys: +0 to 9, A to F are on the key of the same name. +AD (input an address) is the '-' key. ++ and - (increment / decrement address) are the up and down-arrow keys. +GO (execute program at current address) is the X key. +SHIFT - later monitor versions utilised an extra shift button. Hold + it down and press another key (use Left Shift). + +Whenever a program listing mentions RESET, do a Soft Reset. + +Each key causes a beep to be heard. You may need to press more than once +to get it to register. + +Inbuilt games - press the following sequence of keys: +- Welcome: RESET D 1 + 0 2 AD 0 2 7 0 GO GO (Paste: D1^02 -0270XX) +- Nim: RESET AD 3 E 0 GO GO (Paste: -3E0XX) +- Invaders: RESET AD 3 2 0 GO GO (Paste: -320XX) +- Luna Lander: RESET AD 4 9 0 GO GO (Paste: -490XX) + +Thanks to Chris Schwartz who dumped his ROM for me way back in the old days. +It's only taken 25 years to get around to emulating it... + + +Differences between tec1 and tecjmon: + +On the tec1 a keypress is indicated by an NMI from the 74C923; but on +the jmon it sets bit 6 of port 3 low instead. The NMI code is simply +a 'retn' in the jmon rom, so we can use the same code. +The jmon includes a cassette interface, a serial input connection, +and an optional LCD, but the games of the tec1 have been removed. + + +ToDo: +- After a Soft Reset, pressing keys can crash the emulation. +- The 74C923 code may need to be revisited to improve keyboard response. + Sometimes have to press a key a few times before it registers. +- The 10ms debounce is not emulated. + + +JMON ToDo: +- Add LCD display (2 rows by 16 characters) + + +***************************************************************************/ + +#include "emu.h" +#include "cpu/z80/z80.h" +#include "sound/speaker.h" +#include "sound/wave.h" +#include "imagedev/cassette.h" +#include "tec1.lh" + +#define MACHINE_RESET_MEMBER(name) void name::machine_reset() +#define MACHINE_START_MEMBER(name) void name::machine_start() + +class tec1_state : public driver_device +{ +public: + tec1_state(const machine_config &mconfig, device_type type, const char *tag) + : driver_device(mconfig, type, tag), + m_maincpu(*this, "maincpu"), + m_speaker(*this, SPEAKER_TAG), + m_cass(*this, CASSETTE_TAG), + m_wave(*this, WAVE_TAG), + m_key_pressed(0) + { } + + required_device<cpu_device> m_maincpu; + required_device<device_t> m_speaker; + optional_device<cassette_image_device> m_cass; + optional_device<device_t> m_wave; + emu_timer *m_kbd_timer; + DECLARE_READ8_MEMBER( tec1_kbd_r ); + DECLARE_READ8_MEMBER( latch_r ); + DECLARE_WRITE8_MEMBER( tec1_digit_w ); + DECLARE_WRITE8_MEMBER( tecjmon_digit_w ); + DECLARE_WRITE8_MEMBER( tec1_segment_w ); + UINT8 m_kbd; + UINT8 m_segment; + UINT8 m_digit; + UINT8 m_kbd_row; + UINT8 m_refresh[6]; + bool m_key_pressed; + UINT8 tec1_convert_col_to_bin( UINT8 col, UINT8 row ); + virtual void machine_reset(); + virtual void machine_start(); +}; + + + + +/*************************************************************************** + + Display + +***************************************************************************/ + +WRITE8_MEMBER( tec1_state::tec1_segment_w ) +{ +/* d7 segment d + d6 segment e + d5 segment c + d4 segment dot + d3 segment b + d2 segment g + d1 segment f + d0 segment a */ + + m_segment = BITSWAP8(data, 4, 2, 1, 6, 7, 5, 3, 0); +} + +WRITE8_MEMBER( tec1_state::tec1_digit_w ) +{ +/* d7 speaker + d6 not used + d5 data digit 1 + d4 data digit 2 + d3 address digit 1 + d2 address digit 2 + d1 address digit 3 + d0 address digit 4 */ + + speaker_level_w(m_speaker, BIT(data, 7)); + + m_digit = data & 0x3f; +} + +WRITE8_MEMBER( tec1_state::tecjmon_digit_w ) +{ +/* d7 speaker & cassout + d6 not used + d5 data digit 1 + d4 data digit 2 + d3 address digit 1 + d2 address digit 2 + d1 address digit 3 + d0 address digit 4 */ + + speaker_level_w(m_speaker, BIT(data, 7)); + m_cass->output(BIT(data, 7) ? -1.0 : +1.0); + m_digit = data & 0x3f; +} + + +/*************************************************************************** + + Keyboard + +***************************************************************************/ + +READ8_MEMBER( tec1_state::latch_r ) +{ +// bit 7 - cass in ; bit 6 low = key pressed + UINT8 data = (m_key_pressed) ? 0 : 0x40; + + if (m_cass->input() > 0.03) + data |= 0x80; + + return data; +} + + +READ8_MEMBER( tec1_state::tec1_kbd_r ) +{ + cputag_set_input_line(machine(), "maincpu", INPUT_LINE_NMI, CLEAR_LINE); + return m_kbd | ioport("SHIFT")->read(); +} + +UINT8 tec1_state::tec1_convert_col_to_bin( UINT8 col, UINT8 row ) +{ + UINT8 data = row; + + if (BIT(col, 1)) + data |= 4; + else + if (BIT(col, 2)) + data |= 8; + else + if (BIT(col, 3)) + data |= 12; + else + if (BIT(col, 4)) + data |= 16; + + return data; +} + +static TIMER_CALLBACK( tec1_kbd_callback ) +{ + static const char *const keynames[] = { "LINE0", "LINE1", "LINE2", "LINE3" }; + tec1_state *state = machine.driver_data<tec1_state>(); + UINT8 i; + + // Display the digits. Blank any digits that haven't been refreshed for a while. + // This will fix the problem reported by a user. + for (i = 0; i < 6; i++) + { + if (BIT(state->m_digit, i)) + { + state->m_refresh[i] = 1; + output_set_digit_value(i, state->m_segment); + } + else + if (state->m_refresh[i] == 0x80) + { + output_set_digit_value(i, 0); + state->m_refresh[i] = 0; + } + else + if (state->m_refresh[i]) + state->m_refresh[i]++; + } + + // 74C923 4 by 5 key encoder. + // if previous key is still held, bail out + if (machine.root_device().ioport(keynames[state->m_kbd_row])->read()) + if (state->tec1_convert_col_to_bin(machine.root_device().ioport(keynames[state->m_kbd_row])->read(), state->m_kbd_row) == state->m_kbd) + return; + + state->m_kbd_row++; + state->m_kbd_row &= 3; + + /* see if a key pressed */ + if (machine.root_device().ioport(keynames[state->m_kbd_row])->read()) + { + state->m_kbd = state->tec1_convert_col_to_bin(machine.root_device().ioport(keynames[state->m_kbd_row])->read(), state->m_kbd_row); + cputag_set_input_line(machine, "maincpu", INPUT_LINE_NMI, HOLD_LINE); + state->m_key_pressed = TRUE; + } + else + state->m_key_pressed = FALSE; +} + + +/*************************************************************************** + + Machine + +***************************************************************************/ + +MACHINE_START_MEMBER( tec1_state ) +{ + m_kbd_timer = machine().scheduler().timer_alloc(FUNC(tec1_kbd_callback)); + m_kbd_timer->adjust( attotime::zero, 0, attotime::from_hz(500) ); +} + +MACHINE_RESET_MEMBER( tec1_state ) +{ + m_kbd = 0; +} + + + +/*************************************************************************** + + Address Map + +***************************************************************************/ + +static ADDRESS_MAP_START( tec1_map, AS_PROGRAM, 8, tec1_state ) + ADDRESS_MAP_GLOBAL_MASK(0x3fff) + AM_RANGE(0x0000, 0x07ff) AM_ROM + AM_RANGE(0x0800, 0x0fff) AM_RAM // on main board + AM_RANGE(0x1000, 0x3fff) AM_RAM // expansion +ADDRESS_MAP_END + +static ADDRESS_MAP_START( tec1_io, AS_IO, 8, tec1_state ) + ADDRESS_MAP_GLOBAL_MASK(0x07) + AM_RANGE(0x00, 0x00) AM_READ(tec1_kbd_r) + AM_RANGE(0x01, 0x01) AM_WRITE(tec1_digit_w) + AM_RANGE(0x02, 0x02) AM_WRITE(tec1_segment_w) +ADDRESS_MAP_END + + +static ADDRESS_MAP_START( tecjmon_map, AS_PROGRAM, 8, tec1_state ) + ADDRESS_MAP_GLOBAL_MASK(0x3fff) + AM_RANGE(0x0000, 0x07ff) AM_ROM + AM_RANGE(0x0800, 0x37ff) AM_RAM + AM_RANGE(0x3800, 0x3fff) AM_ROM +ADDRESS_MAP_END + +static ADDRESS_MAP_START( tecjmon_io, AS_IO, 8, tec1_state ) + ADDRESS_MAP_GLOBAL_MASK(0xff) + AM_RANGE(0x00, 0x00) AM_READ(tec1_kbd_r) + AM_RANGE(0x01, 0x01) AM_WRITE(tecjmon_digit_w) + AM_RANGE(0x02, 0x02) AM_WRITE(tec1_segment_w) + AM_RANGE(0x03, 0x03) AM_READ(latch_r) + //AM_RANGE(0x04, 0x04) AM_WRITE(lcd_en_w) + //AM_RANGE(0x84, 0x84) AM_WRITE(lcd_2nd_w) +ADDRESS_MAP_END + + +/************************************************************************** + + Keyboard Layout + +***************************************************************************/ + +static INPUT_PORTS_START( tec1 ) + PORT_START("LINE0") /* KEY ROW 0 */ + PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("0") PORT_CODE(KEYCODE_0) PORT_CHAR('0') + PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("4") PORT_CODE(KEYCODE_4) PORT_CHAR('4') + PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("8") PORT_CODE(KEYCODE_8) PORT_CHAR('8') + PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("C") PORT_CODE(KEYCODE_C) PORT_CHAR('C') + PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("+") PORT_CODE(KEYCODE_UP) PORT_CHAR('^') + + PORT_START("LINE1") /* KEY ROW 1 */ + PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("1") PORT_CODE(KEYCODE_1) PORT_CHAR('1') + PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("5") PORT_CODE(KEYCODE_5) PORT_CHAR('5') + PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("9") PORT_CODE(KEYCODE_9) PORT_CHAR('9') + PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("D") PORT_CODE(KEYCODE_D) PORT_CHAR('D') + PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("-") PORT_CODE(KEYCODE_DOWN) PORT_CHAR('V') + + PORT_START("LINE2") /* KEY ROW 2 */ + PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("2") PORT_CODE(KEYCODE_2) PORT_CHAR('2') + PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("6") PORT_CODE(KEYCODE_6) PORT_CHAR('6') + PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("A") PORT_CODE(KEYCODE_A) PORT_CHAR('A') + PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("E") PORT_CODE(KEYCODE_E) PORT_CHAR('E') + PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("GO") PORT_CODE(KEYCODE_X) PORT_CHAR('X') + + PORT_START("LINE3") /* KEY ROW 3 */ + PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("3") PORT_CODE(KEYCODE_3) PORT_CHAR('3') + PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("7") PORT_CODE(KEYCODE_7) PORT_CHAR('7') + PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("B") PORT_CODE(KEYCODE_B) PORT_CHAR('B') + PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("F") PORT_CODE(KEYCODE_F) PORT_CHAR('F') + PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("AD") PORT_CODE(KEYCODE_MINUS) PORT_CHAR('-') + + PORT_START("SHIFT") + PORT_BIT(0x1f, IP_ACTIVE_HIGH, IPT_UNUSED) + PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Shift") PORT_CODE(KEYCODE_LSHIFT) + PORT_BIT(0xc0, IP_ACTIVE_LOW, IPT_UNUSED) +INPUT_PORTS_END + + +/*************************************************************************** + + Machine driver + +***************************************************************************/ + +static MACHINE_CONFIG_START( tec1, tec1_state ) + /* basic machine hardware */ + MCFG_CPU_ADD("maincpu", Z80, 1000000) /* speed can be varied between 250kHz and 2MHz */ + MCFG_CPU_PROGRAM_MAP(tec1_map) + MCFG_CPU_IO_MAP(tec1_io) + + /* video hardware */ + MCFG_DEFAULT_LAYOUT(layout_tec1) + + /* sound hardware */ + MCFG_SPEAKER_STANDARD_MONO("mono") + MCFG_SOUND_ADD(SPEAKER_TAG, SPEAKER_SOUND, 0) + MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.50) +MACHINE_CONFIG_END + +static MACHINE_CONFIG_START( tecjmon, tec1_state ) + /* basic machine hardware */ + MCFG_CPU_ADD("maincpu", Z80, XTAL_3_579545MHz / 2) + MCFG_CPU_PROGRAM_MAP(tecjmon_map) + MCFG_CPU_IO_MAP(tecjmon_io) + + /* video hardware */ + MCFG_DEFAULT_LAYOUT(layout_tec1) + + /* sound hardware */ + MCFG_SPEAKER_STANDARD_MONO("mono") + MCFG_SOUND_ADD(SPEAKER_TAG, SPEAKER_SOUND, 0) + MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.50) + MCFG_SOUND_WAVE_ADD(WAVE_TAG, CASSETTE_TAG) + MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.25) + + /* Devices */ + MCFG_CASSETTE_ADD( CASSETTE_TAG, default_cassette_interface ) +MACHINE_CONFIG_END + + +/*************************************************************************** + + Game driver + +***************************************************************************/ + +ROM_START(tec1) + ROM_REGION(0x10000, "maincpu", ROMREGION_ERASEFF) + ROM_SYSTEM_BIOS(0, "mon1", "MON1") + ROMX_LOAD("mon1.rom", 0x0000, 0x0800, CRC(b3390c36) SHA1(18aabc68d473206b7fc4e365c6b57a4e218482c3), ROM_BIOS(1)) + ROM_SYSTEM_BIOS(1, "mon1b", "MON1B") + ROMX_LOAD("mon1b.rom", 0x0000, 0x0800, CRC(60daea3c) SHA1(383b7e7f02e91fb18c87eb03c5949e31156771d4), ROM_BIOS(2)) + ROM_SYSTEM_BIOS(2, "mon2", "MON2") + ROMX_LOAD("mon2.rom", 0x0000, 0x0800, CRC(082fd7e7) SHA1(7659add30ca22b15a03d1cbac0892a5c25e47ecd), ROM_BIOS(3)) +ROM_END + +ROM_START(tecjmon) + ROM_REGION(0x10000, "maincpu", ROMREGION_ERASEFF) + ROM_LOAD("jmon.rom", 0x0000, 0x0800, CRC(202c47a2) SHA1(701588ec5640d633d90d94b2ccd6f65422e19a70) ) + ROM_LOAD("util.rom", 0x3800, 0x0800, CRC(7c19700d) SHA1(dc5b3ade66bb11c54430056966ed99cdd299d82b) ) +ROM_END + +/* YEAR NAME PARENT COMPAT MACHINE INPUT INIT COMPANY FULLNAME */ +COMP( 1984, tec1, 0, 0, tec1, tec1, driver_device, 0, "Talking Electronics magazine", "TEC-1" , 0 ) +COMP( 1984, tecjmon, tec1, 0, tecjmon, tec1, driver_device, 0, "Talking Electronics magazine", "TEC-1A with JMON" , 0 ) |