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jack: improve sound timer

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This commit is contained in:
hap 2025-03-18 16:52:37 +01:00
parent c09a48cc9e
commit 6987c8f6bc
4 changed files with 84 additions and 75 deletions
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126
src/mame/cinematronics/jack.cpp
View File

@ -44,6 +44,7 @@ Notes:
Todo: Todo:
- fix striv hanging notes - fix striv hanging notes
- verify zzyzzyxx port b sound timer
- fix tripool palette problems (see attract) - fix tripool palette problems (see attract)
The tripool driver used to have a hack making the vblank interrupt go off The tripool driver used to have a hack making the vblank interrupt go off
twice per frame, this made the game run way too fast, but no palette bug. twice per frame, this made the game run way too fast, but no palette bug.
@ -84,8 +85,7 @@ Stephh's Notes:
#include "jack.h" #include "jack.h"
#include "cpu/z80/z80.h" #include "cpu/z80/z80.h"
#include "sound/ay8910.h"
#include "screen.h"
#include "speaker.h" #include "speaker.h"
@ -96,11 +96,29 @@ Stephh's Notes:
* *
*************************************/ *************************************/
uint8_t jack_state::timer_r() uint8_t jack_state::jack_timer_r()
{ {
/* wrong! there should be no need for timer_rate, the same function */ // jack, tripool, sucasino: checks bit 3
/* should work for both games */ // zzyzzyxx, joinem, unclepoo: adds 0x0a and expects 0 (0xf6 + 0x0a)
return m_audiocpu->total_cycles() / m_timer_rate; // loverboy: checks bit 6
// freeze, striv: unused
// 74LS74 and 74LS393 to divide audiocpu clock
uint64_t input = m_audiocpu->total_cycles() >> 9;
// 74LS393 2QD: 74LS90 in bi-quinary count mode
static const int lut_74ls90[10] = { 0, 2, 4, 6, 8, 1, 3, 5, 7, 9 };
uint8_t output = lut_74ls90[(input >> 1) % 10];
// B3,B6,B7: 74LS90 QC,QD,QA
// B4: 74LS393 2QD
return (BIT(output, 0) << 7) | (BIT(output, 3) << 6) | ((input & 1) << 4) | (BIT(output, 2) << 3);
}
uint8_t jack_state::zzyzzyxx_timer_r()
{
// zzyzzyxx sound driver doesn't work with how it's described in jack schematics, so let's use the old method
return m_audiocpu->total_cycles() / 32;
} }
IRQ_CALLBACK_MEMBER(jack_state::jack_sh_irq_ack) IRQ_CALLBACK_MEMBER(jack_state::jack_sh_irq_ack)
@ -244,8 +262,8 @@ void jack_state::sound_map(address_map &map)
void jack_state::sound_io_map(address_map &map) void jack_state::sound_io_map(address_map &map)
{ {
map.global_mask(0xff); map.global_mask(0xff);
map(0x40, 0x40).rw("aysnd", FUNC(ay8910_device::data_r), FUNC(ay8910_device::data_w)); map(0x40, 0x40).rw(m_aysnd, FUNC(ay8910_device::data_r), FUNC(ay8910_device::data_w));
map(0x80, 0x80).w("aysnd", FUNC(ay8910_device::address_w)); map(0x80, 0x80).w(m_aysnd, FUNC(ay8910_device::address_w));
} }
@ -929,7 +947,7 @@ MACHINE_RESET_MEMBER(jack_state,joinem)
void jack_state::jack(machine_config &config) void jack_state::jack(machine_config &config)
{ {
constexpr XTAL MASTER_XTAL = 18_MHz_XTAL; // labeled "18MHz" in the schematics, but might this really be 18.432 (like Galaxian, etc.)? constexpr XTAL MASTER_XTAL = 18_MHz_XTAL; // 18MHz in the schematics, should be correct
/* basic machine hardware */ /* basic machine hardware */
Z80(config, m_maincpu, MASTER_XTAL / 6); Z80(config, m_maincpu, MASTER_XTAL / 6);
@ -942,10 +960,10 @@ void jack_state::jack(machine_config &config)
m_audiocpu->set_irq_acknowledge_callback(FUNC(jack_state::jack_sh_irq_ack)); m_audiocpu->set_irq_acknowledge_callback(FUNC(jack_state::jack_sh_irq_ack));
/* video hardware */ /* video hardware */
screen_device &screen(SCREEN(config, "screen", SCREEN_TYPE_RASTER)); SCREEN(config, m_screen, SCREEN_TYPE_RASTER);
screen.set_raw(MASTER_XTAL / 3, 384, 0, 256, 264, 16, 240); m_screen->set_raw(MASTER_XTAL / 3, 384, 0, 256, 264, 16, 240);
screen.set_screen_update(FUNC(jack_state::screen_update_jack)); m_screen->set_screen_update(FUNC(jack_state::screen_update_jack));
screen.set_palette(m_palette); m_screen->set_palette(m_palette);
GFXDECODE(config, m_gfxdecode, m_palette, gfx_jack); GFXDECODE(config, m_gfxdecode, m_palette, gfx_jack);
PALETTE(config, m_palette).set_format(palette_device::BGR_233_inverted, 32); PALETTE(config, m_palette).set_format(palette_device::BGR_233_inverted, 32);
@ -956,10 +974,10 @@ void jack_state::jack(machine_config &config)
GENERIC_LATCH_8(config, m_soundlatch); GENERIC_LATCH_8(config, m_soundlatch);
m_soundlatch->data_pending_callback().set_inputline(m_audiocpu, 0, ASSERT_LINE); m_soundlatch->data_pending_callback().set_inputline(m_audiocpu, 0, ASSERT_LINE);
ay8910_device &aysnd(AY8910(config, "aysnd", MASTER_XTAL / 12)); AY8910(config, m_aysnd, MASTER_XTAL / 12);
aysnd.port_a_read_callback().set(m_soundlatch, FUNC(generic_latch_8_device::read)); m_aysnd->port_a_read_callback().set(m_soundlatch, FUNC(generic_latch_8_device::read));
aysnd.port_b_read_callback().set(FUNC(jack_state::timer_r)); m_aysnd->port_b_read_callback().set(FUNC(jack_state::jack_timer_r));
aysnd.add_route(ALL_OUTPUTS, "mono", 1.0); m_aysnd->add_route(ALL_OUTPUTS, "mono", 1.0);
} }
void jack_state::treahunt(machine_config &config) void jack_state::treahunt(machine_config &config)
@ -968,6 +986,12 @@ void jack_state::treahunt(machine_config &config)
m_maincpu->set_addrmap(AS_OPCODES, &jack_state::decrypted_opcodes_map); m_maincpu->set_addrmap(AS_OPCODES, &jack_state::decrypted_opcodes_map);
} }
void jack_state::zzyzzyxx(machine_config &config)
{
jack(config);
m_aysnd->port_b_read_callback().set(FUNC(jack_state::zzyzzyxx_timer_r));
}
void jack_state::striv(machine_config &config) void jack_state::striv(machine_config &config)
{ {
@ -980,7 +1004,7 @@ void jack_state::striv(machine_config &config)
MCFG_MACHINE_RESET_OVERRIDE(jack_state,striv) MCFG_MACHINE_RESET_OVERRIDE(jack_state,striv)
/* video hardware */ /* video hardware */
subdevice<screen_device>("screen")->set_screen_update(FUNC(jack_state::screen_update_striv)); m_screen->set_screen_update(FUNC(jack_state::screen_update_striv));
} }
@ -992,7 +1016,7 @@ INTERRUPT_GEN_MEMBER(jack_state::joinem_vblank_irq)
device.execute().pulse_input_line(INPUT_LINE_NMI, attotime::zero); device.execute().pulse_input_line(INPUT_LINE_NMI, attotime::zero);
} }
void jack_state::joinem(machine_config &config) void jack_state::loverboy(machine_config &config)
{ {
jack(config); jack(config);
@ -1005,7 +1029,7 @@ void jack_state::joinem(machine_config &config)
MCFG_MACHINE_RESET_OVERRIDE(jack_state,joinem) MCFG_MACHINE_RESET_OVERRIDE(jack_state,joinem)
/* video hardware */ /* video hardware */
subdevice<screen_device>("screen")->set_screen_update(FUNC(jack_state::screen_update_joinem)); m_screen->set_screen_update(FUNC(jack_state::screen_update_joinem));
m_gfxdecode->set_info(gfx_joinem); m_gfxdecode->set_info(gfx_joinem);
@ -1014,6 +1038,11 @@ void jack_state::joinem(machine_config &config)
MCFG_VIDEO_START_OVERRIDE(jack_state,joinem) MCFG_VIDEO_START_OVERRIDE(jack_state,joinem)
} }
void jack_state::joinem(machine_config &config)
{
loverboy(config);
m_aysnd->port_b_read_callback().set(FUNC(jack_state::zzyzzyxx_timer_r));
}
void jack_state::unclepoo(machine_config &config) void jack_state::unclepoo(machine_config &config)
{ {
@ -1023,8 +1052,7 @@ void jack_state::unclepoo(machine_config &config)
m_maincpu->set_addrmap(AS_PROGRAM, &jack_state::unclepoo_map); m_maincpu->set_addrmap(AS_PROGRAM, &jack_state::unclepoo_map);
/* video hardware */ /* video hardware */
subdevice<screen_device>("screen")->set_visarea(0*8, 32*8-1, 1*8, 31*8-1); m_screen->set_visarea(0*8, 32*8-1, 1*8, 31*8-1);
m_palette->set_entries(256); m_palette->set_entries(256);
} }
@ -1515,19 +1543,7 @@ ROM_END
* *
*************************************/ *************************************/
void jack_state::init_jack() void jack_state::init_treahunt()
{
m_timer_rate = 256;
}
void jack_state::init_zzyzzyxx()
{
m_timer_rate = 32;
}
void jack_state::treahunt_decode( )
{ {
uint8_t *rom = memregion("maincpu")->base(); uint8_t *rom = memregion("maincpu")->base();
@ -1559,19 +1575,13 @@ void jack_state::treahunt_decode( )
(~data & 0x81) | (~data & 0x81) |
((data & 0x02) << 3) | ((data & 0x02) << 3) |
((data & 0x04) << 4) | ((data & 0x04) << 4) |
(data & 0x28) | (data & 0x28) |
((data & 0x10) >> 3) | ((data & 0x10) >> 3) |
((data & 0x40) >> 4); ((data & 0x40) >> 4);
} }
} }
} }
void jack_state::init_treahunt()
{
m_timer_rate = 256;
treahunt_decode();
}
void jack_state::init_loverboy() void jack_state::init_loverboy()
{ {
@ -1589,8 +1599,6 @@ void jack_state::init_loverboy()
uint8_t *ROM = memregion("maincpu")->base(); uint8_t *ROM = memregion("maincpu")->base();
ROM[0x13] = 0x01; ROM[0x13] = 0x01;
ROM[0x12] = 0x9d; ROM[0x12] = 0x9d;
m_timer_rate = 32;
} }
@ -1619,8 +1627,6 @@ void jack_state::init_striv()
ROM[A] = bitswap<8>(data,0,2,5,1,3,6,4,7); ROM[A] = bitswap<8>(data,0,2,5,1,3,6,4,7);
} }
} }
m_timer_rate = 256;
} }
@ -1632,20 +1638,20 @@ void jack_state::init_striv()
*************************************/ *************************************/
// YEAR NAME PARENT MACHINE INPUT CLASS INIT SCREEN COMPANY, FULLNAME, FLAGS // YEAR NAME PARENT MACHINE INPUT CLASS INIT SCREEN COMPANY, FULLNAME, FLAGS
GAME( 1982, jack, 0, jack, jack, jack_state, init_jack, ROT90, "Hara Industries (Cinematronics license)", "Jack the Giantkiller (set 1)", MACHINE_SUPPORTS_SAVE ) GAME( 1982, jack, 0, jack, jack, jack_state, empty_init, ROT90, "Hara Industries (Cinematronics license)", "Jack the Giantkiller (set 1)", MACHINE_SUPPORTS_SAVE )
GAME( 1982, jack2, jack, jack, jack2, jack_state, init_jack, ROT90, "Hara Industries (Cinematronics license)", "Jack the Giantkiller (set 2)", MACHINE_SUPPORTS_SAVE ) GAME( 1982, jack2, jack, jack, jack2, jack_state, empty_init, ROT90, "Hara Industries (Cinematronics license)", "Jack the Giantkiller (set 2)", MACHINE_SUPPORTS_SAVE )
GAME( 1982, jack3, jack, jack, jack3, jack_state, init_jack, ROT90, "Hara Industries (Cinematronics license)", "Jack the Giantkiller (set 3)", MACHINE_SUPPORTS_SAVE ) GAME( 1982, jack3, jack, jack, jack3, jack_state, empty_init, ROT90, "Hara Industries (Cinematronics license)", "Jack the Giantkiller (set 3)", MACHINE_SUPPORTS_SAVE )
GAME( 1982, treahunt, jack, treahunt, treahunt, jack_state, init_treahunt, ROT90, "Hara Industries", "Treasure Hunt", MACHINE_SUPPORTS_SAVE ) GAME( 1982, treahunt, jack, treahunt, treahunt, jack_state, init_treahunt, ROT90, "Hara Industries", "Treasure Hunt", MACHINE_SUPPORTS_SAVE )
GAME( 1982, zzyzzyxx, 0, jack, zzyzzyxx, jack_state, init_zzyzzyxx, ROT90, "Cinematronics / Advanced Microcomputer Systems", "Zzyzzyxx (set 1)", MACHINE_SUPPORTS_SAVE ) GAME( 1982, zzyzzyxx, 0, zzyzzyxx, zzyzzyxx, jack_state, empty_init, ROT90, "Cinematronics / Advanced Microcomputer Systems", "Zzyzzyxx (set 1)", MACHINE_SUPPORTS_SAVE )
GAME( 1982, zzyzzyxx2, zzyzzyxx, jack, zzyzzyxx, jack_state, init_zzyzzyxx, ROT90, "Cinematronics / Advanced Microcomputer Systems", "Zzyzzyxx (set 2)", MACHINE_SUPPORTS_SAVE ) GAME( 1982, zzyzzyxx2, zzyzzyxx, zzyzzyxx, zzyzzyxx, jack_state, empty_init, ROT90, "Cinematronics / Advanced Microcomputer Systems", "Zzyzzyxx (set 2)", MACHINE_SUPPORTS_SAVE )
GAME( 1982, brix, zzyzzyxx, jack, zzyzzyxx, jack_state, init_zzyzzyxx, ROT90, "Cinematronics / Advanced Microcomputer Systems", "Brix", MACHINE_SUPPORTS_SAVE ) GAME( 1982, brix, zzyzzyxx, zzyzzyxx, zzyzzyxx, jack_state, empty_init, ROT90, "Cinematronics / Advanced Microcomputer Systems", "Brix", MACHINE_SUPPORTS_SAVE )
GAME( 1984, freeze, 0, jack, freeze, jack_state, init_jack, ROT90, "Cinematronics", "Freeze", MACHINE_SUPPORTS_SAVE | MACHINE_NO_COCKTAIL ) GAME( 1984, freeze, 0, jack, freeze, jack_state, empty_init, ROT90, "Cinematronics", "Freeze", MACHINE_SUPPORTS_SAVE | MACHINE_NO_COCKTAIL )
GAME( 1981, tripool, 0, jack, tripool, jack_state, init_jack, ROT90, "Noma (Casino Tech license)", "Tri-Pool: 3-In-One (Casino Tech)", MACHINE_IMPERFECT_GRAPHICS | MACHINE_SUPPORTS_SAVE ) GAME( 1981, tripool, 0, jack, tripool, jack_state, empty_init, ROT90, "Noma (Casino Tech license)", "Tri-Pool: 3-In-One (Casino Tech)", MACHINE_IMPERFECT_GRAPHICS | MACHINE_SUPPORTS_SAVE )
GAME( 1981, tripoola, tripool, jack, tripool, jack_state, init_jack, ROT90, "Noma (Coastal Games license)", "Tri-Pool: 3-In-One (Coastal Games)", MACHINE_IMPERFECT_GRAPHICS | MACHINE_SUPPORTS_SAVE ) GAME( 1981, tripoola, tripool, jack, tripool, jack_state, empty_init, ROT90, "Noma (Coastal Games license)", "Tri-Pool: 3-In-One (Coastal Games)", MACHINE_IMPERFECT_GRAPHICS | MACHINE_SUPPORTS_SAVE )
GAME( 1984, sucasino, 0, jack, sucasino, jack_state, init_jack, ROT90, "Data Amusement", "Super Casino", MACHINE_SUPPORTS_SAVE ) GAME( 1984, sucasino, 0, jack, sucasino, jack_state, empty_init, ROT90, "Data Amusement", "Super Casino", MACHINE_SUPPORTS_SAVE )
GAME( 1985, striv, 0, striv, striv, jack_state, init_striv, ROT270, "Nova du Canada", "Super Triv (English questions)", MACHINE_IMPERFECT_SOUND | MACHINE_SUPPORTS_SAVE ) GAME( 1985, striv, 0, striv, striv, jack_state, init_striv, ROT270, "Nova du Canada", "Super Triv (English questions)", MACHINE_IMPERFECT_SOUND | MACHINE_SUPPORTS_SAVE )
GAME( 1985, strivf, striv, striv, striv, jack_state, init_striv, ROT270, "Nova du Canada", "Super Triv (French questions)", MACHINE_IMPERFECT_SOUND | MACHINE_SUPPORTS_SAVE ) // Hara Industries PCB GAME( 1985, strivf, striv, striv, striv, jack_state, init_striv, ROT270, "Nova du Canada", "Super Triv (French questions)", MACHINE_IMPERFECT_SOUND | MACHINE_SUPPORTS_SAVE ) // Hara Industries PCB
GAME( 1983, joinem, 0, joinem, joinem, jack_state, init_zzyzzyxx, ROT90, "Global Corporation", "Joinem", MACHINE_SUPPORTS_SAVE ) GAME( 1983, joinem, 0, joinem, joinem, jack_state, empty_init, ROT90, "Global Corporation", "Joinem", MACHINE_SUPPORTS_SAVE )
GAME( 1983, unclepoo, 0, unclepoo, unclepoo, jack_state, init_zzyzzyxx, ROT90, "Diatec", "Uncle Poo", MACHINE_SUPPORTS_SAVE ) // based on Joinem? GAME( 1983, unclepoo, 0, unclepoo, unclepoo, jack_state, empty_init, ROT90, "Diatec", "Uncle Poo", MACHINE_SUPPORTS_SAVE ) // based on Joinem?
GAME( 1983, loverboy, 0, joinem, loverboy, jack_state, init_loverboy, ROT90, "G.T Enterprise Inc", "Lover Boy", MACHINE_SUPPORTS_SAVE ) GAME( 1983, loverboy, 0, loverboy, loverboy, jack_state, init_loverboy, ROT90, "G.T Enterprise Inc", "Lover Boy", MACHINE_SUPPORTS_SAVE )
GAME( 1993, trikitri, loverboy, joinem, loverboy, jack_state, init_loverboy, ROT90, "bootleg (DDT Enterprise Inc)", "Triki Triki (bootleg of Lover Boy)", MACHINE_SUPPORTS_SAVE ) GAME( 1993, trikitri, loverboy, loverboy, loverboy, jack_state, init_loverboy, ROT90, "bootleg (DDT Enterprise Inc)", "Triki Triki (bootleg of Lover Boy)", MACHINE_SUPPORTS_SAVE )

28
src/mame/cinematronics/jack.h
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@ -12,7 +12,10 @@
#pragma once #pragma once
#include "machine/gen_latch.h" #include "machine/gen_latch.h"
#include "sound/ay8910.h"
#include "emupal.h" #include "emupal.h"
#include "screen.h"
#include "tilemap.h" #include "tilemap.h"
class jack_state : public driver_device class jack_state : public driver_device
@ -28,21 +31,23 @@ public:
m_colorram(*this, "colorram"), m_colorram(*this, "colorram"),
m_gfxdecode(*this, "gfxdecode"), m_gfxdecode(*this, "gfxdecode"),
m_palette(*this, "palette"), m_palette(*this, "palette"),
m_screen(*this, "screen"),
m_aysnd(*this, "aysnd"),
m_soundlatch(*this, "soundlatch"), m_soundlatch(*this, "soundlatch"),
m_decrypted_opcodes(*this, "decrypted_opcodes") m_decrypted_opcodes(*this, "decrypted_opcodes")
{ } { }
void joinem(machine_config &config);
void treahunt(machine_config &config);
void unclepoo(machine_config &config);
void striv(machine_config &config);
void jack(machine_config &config); void jack(machine_config &config);
void treahunt(machine_config &config);
void zzyzzyxx(machine_config &config);
void striv(machine_config &config);
void joinem(machine_config &config);
void unclepoo(machine_config &config);
void loverboy(machine_config &config);
void init_zzyzzyxx();
void init_striv();
void init_treahunt(); void init_treahunt();
void init_striv();
void init_loverboy(); void init_loverboy();
void init_jack();
private: private:
/* device- and memory pointers */ /* device- and memory pointers */
@ -54,14 +59,15 @@ private:
required_shared_ptr<uint8_t> m_colorram; required_shared_ptr<uint8_t> m_colorram;
required_device<gfxdecode_device> m_gfxdecode; required_device<gfxdecode_device> m_gfxdecode;
required_device<palette_device> m_palette; required_device<palette_device> m_palette;
required_device<screen_device> m_screen;
required_device<ay8910_device> m_aysnd;
required_device<generic_latch_8_device> m_soundlatch; required_device<generic_latch_8_device> m_soundlatch;
optional_shared_ptr<uint8_t> m_decrypted_opcodes; optional_shared_ptr<uint8_t> m_decrypted_opcodes;
/* video-related */ /* video-related */
tilemap_t *m_bg_tilemap = nullptr; tilemap_t *m_bg_tilemap = nullptr;
/* misc */ /* misc */
int m_timer_rate = 0;
uint8_t m_joinem_nmi_enable = 0U; uint8_t m_joinem_nmi_enable = 0U;
uint8_t m_joinem_palette_bank = 0U; uint8_t m_joinem_palette_bank = 0U;
int m_question_address = 0; int m_question_address = 0;
@ -76,7 +82,8 @@ private:
void jack_colorram_w(offs_t offset, uint8_t data); void jack_colorram_w(offs_t offset, uint8_t data);
uint8_t jack_flipscreen_r(offs_t offset); uint8_t jack_flipscreen_r(offs_t offset);
void jack_flipscreen_w(offs_t offset, uint8_t data); void jack_flipscreen_w(offs_t offset, uint8_t data);
uint8_t timer_r(); uint8_t jack_timer_r();
uint8_t zzyzzyxx_timer_r();
TILE_GET_INFO_MEMBER(get_bg_tile_info); TILE_GET_INFO_MEMBER(get_bg_tile_info);
TILEMAP_MAPPER_MEMBER(tilemap_scan_cols_flipy); TILEMAP_MAPPER_MEMBER(tilemap_scan_cols_flipy);
@ -99,7 +106,6 @@ private:
INTERRUPT_GEN_MEMBER(joinem_vblank_irq); INTERRUPT_GEN_MEMBER(joinem_vblank_irq);
void jack_draw_sprites( bitmap_ind16 &bitmap, const rectangle &cliprect ); void jack_draw_sprites( bitmap_ind16 &bitmap, const rectangle &cliprect );
void joinem_draw_sprites( bitmap_ind16 &bitmap, const rectangle &cliprect ); void joinem_draw_sprites( bitmap_ind16 &bitmap, const rectangle &cliprect );
void treahunt_decode( );
void decrypted_opcodes_map(address_map &map) ATTR_COLD; void decrypted_opcodes_map(address_map &map) ATTR_COLD;
void jack_map(address_map &map) ATTR_COLD; void jack_map(address_map &map) ATTR_COLD;
void joinem_map(address_map &map) ATTR_COLD; void joinem_map(address_map &map) ATTR_COLD;

3
src/mame/cinematronics/jack_v.cpp
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@ -111,9 +111,6 @@ uint32_t jack_state::screen_update_striv(screen_device &screen, bitmap_ind16 &bi
/*************************************************************************** /***************************************************************************
Joinem has a bit different video hardware with proms based palette, Joinem has a bit different video hardware with proms based palette,

2
src/mame/fidelity/sc9.cpp
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@ -38,7 +38,7 @@ Known modules (*denotes undumped):
- *CG64: 64 Greatest Games - *CG64: 64 Greatest Games
- DVC: Sicilan Varation (prototype) - DVC: Sicilan Varation (prototype)
- EOA-EOE: Chess Encyclopedia Volume A-E (5 modules, needs 7seg display) - EOA-EOE: Chess Encyclopedia Volume A-E (5 modules, needs 7seg display)
- *TDF: Tarrasch Defense to the Queen's Gambit - *TDF: Tarrasch Defence to the Queen's Gambit
The edge connector has D0-D7, A0-A13, 2 chip select lines, read/write lines, IRQ The edge connector has D0-D7, A0-A13, 2 chip select lines, read/write lines, IRQ
line. IRQ and write strobe are unused. Maximum known size is 16KB. line. IRQ and write strobe are unused. Maximum known size is 16KB.