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Diffstat (limited to 'src/mame/akai/akaiax80.cpp')
-rw-r--r-- | src/mame/akai/akaiax80.cpp | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/src/mame/akai/akaiax80.cpp b/src/mame/akai/akaiax80.cpp new file mode 100644 index 00000000000..d90e13f1927 --- /dev/null +++ b/src/mame/akai/akaiax80.cpp @@ -0,0 +1,141 @@ +// license:BSD-3-Clause +// copyright-holders:R. Belmont +/*************************************************************************** + + akaiax80.cpp - Akai AX80 8-voice polyphonic synthesizer + + Skeleton driver by R. Belmont + ROMs provided by Arashikage + + Hardware: + CPU: uPD7811 with internal ROM + Other H/W: 8253 PIT (x6), 8255 PPI (x2), 8279 keyboard/display controller + Voices (x8): + NJM4558D sawtooth generator (x2) + TC4011BP wave shaper + TC4013 sub oscillator + CEM 3372 VCA/VCF + Final out: + TL082CP low-pass filter + + Service manual incl. schematics at: + https://archive.org/download/AkaiAX80ServiceManual/Akai%20AX80%20Service%20Manual.pdf + + There's a 2nd UPD7811 (IC1) to scan the keyboard. Its internal rom is undumped. + Ports A/B/C go to the keyboard, Port D (d0-6) connects 1-to-1 to Port A of IC2 + (Main CPU). Ports F and AN are unused. PD7 goes to /INT2 of IC2, /NMI goes to PA7 + of IC2. + + Both CPUs are hardwired as MODE 1, and both share a CSA120MT crystal. + + RAM is backed up by a CR2430-T battery. + + A crystal, type HC-16, (6,554,800Hz) generates various frequencies to drive the PITs + and the 8279. Later production used a 6,553,600Hz instead. + + +****************************************************************************/ + +#include "emu.h" +#include "cpu/upd7810/upd7810.h" +#include "machine/pit8253.h" +#include "machine/i8255.h" +#include "machine/i8279.h" + + +namespace { + +#define PIT0_TAG "pit0" +#define PIT1_TAG "pit1" +#define PIT2_TAG "pit2" +#define PIT3_TAG "pit3" +#define PIT4_TAG "pit4" +#define PIT5_TAG "pit5" +#define PPI0_TAG "ppi0" +#define PPI1_TAG "ppi1" + +class ax80_state : public driver_device +{ +public: + ax80_state(const machine_config &mconfig, device_type type, const char *tag) + : driver_device(mconfig, type, tag) + , m_maincpu(*this, "maincpu") + { } + + void ax80(machine_config &config); + +private: + void ax80_map(address_map &map) ATTR_COLD; + + virtual void machine_reset() override ATTR_COLD; + required_device<upd7810_device> m_maincpu; +}; + +void ax80_state::machine_reset() +{ +} + +void ax80_state::ax80_map(address_map &map) +{ + //map(0x0000, 0x0fff).rom().region("maincpu", 0); // internal ROM + map(0x1000, 0x1003).mirror(0x000c).rw(PIT0_TAG, FUNC(pit8253_device::read), FUNC(pit8253_device::write)); // IC20 + map(0x1010, 0x1013).mirror(0x000c).rw(PIT1_TAG, FUNC(pit8253_device::read), FUNC(pit8253_device::write)); // IC21 + map(0x1020, 0x1023).mirror(0x000c).rw(PIT2_TAG, FUNC(pit8253_device::read), FUNC(pit8253_device::write)); // IC22 + map(0x1030, 0x1033).mirror(0x000c).rw(PIT3_TAG, FUNC(pit8253_device::read), FUNC(pit8253_device::write)); // IC23 + map(0x1040, 0x1043).mirror(0x000c).rw(PIT4_TAG, FUNC(pit8253_device::read), FUNC(pit8253_device::write)); // IC24 + map(0x1050, 0x1053).mirror(0x000c).rw(PIT5_TAG, FUNC(pit8253_device::read), FUNC(pit8253_device::write)); // IC25 + map(0x1060, 0x1061).mirror(0x000e).rw("kdc", FUNC(i8279_device::read), FUNC(i8279_device::write)); // IC11 + map(0x1070, 0x1073).mirror(0x000c).rw(PPI1_TAG, FUNC(i8255_device::read), FUNC(i8255_device::write)); // IC10 + //map(0x2000, 0x2001).mirror(0x0dfe).rw(PPI0_TAG, FUNC(i8255_device::read), FUNC(i8255_device::write)); // IC9 - A9 connects to A1-pin + //map(0x2200, 0x2201).mirror(0x0dfe).rw(PPI0_TAG, FUNC(i8255_device::read), FUNC(i8255_device::write)); // IC9 - A9 connects to A1-pin + //map(0x3000, 0x3fff) // steers audio to the various voice channels + map(0x4000, 0x5fff).mirror(0x2000).rom().region("program", 0); // external program EPROM + map(0x8000, 0x87ff).mirror(0x3800).ram(); + map(0xc000, 0xc7ff).mirror(0x3800).ram(); +} + +void ax80_state::ax80(machine_config &config) +{ + UPD7811(config, m_maincpu, XTAL(12'000'000)); + m_maincpu->set_addrmap(AS_PROGRAM, &ax80_state::ax80_map); + //m_maincpu->set_addrmap(AS_IO, &ax80_state::ax80_io); + + PIT8253(config, PIT0_TAG, 0); + PIT8253(config, PIT1_TAG, 0); + PIT8253(config, PIT2_TAG, 0); + PIT8253(config, PIT3_TAG, 0); + PIT8253(config, PIT4_TAG, 0); + PIT8253(config, PIT5_TAG, 0); + + I8255A(config, PPI0_TAG); + I8255A(config, PPI1_TAG); + + I8279(config, "kdc", 6554800 / 8); // Keyboard/Display Controller + //kdc.out_irq_calback().set_inputline("maincpu", UPD7810_INTF1); // irq + //kdc.out_sl_callback().set(FUNC(ax80_state::scanlines_w)); // scan SL lines + //kdc.out_disp_callback().set(FUNC(ax80_state::digit_w)); // display A&B + //kdc.in_rl_callback().set(FUNC(ax80_state::kbd_r)) // kbd RL lines + //kdc.in_shift_callback().set_constant(1); // not connected + //kdc.in_ctrl_callback().set_constant(1); // not connected +} + +static INPUT_PORTS_START( ax80 ) +INPUT_PORTS_END + +ROM_START( ax80 ) + ROM_REGION(0x1000, "maincpu", 0) // CPU internal mask + ROM_LOAD( "akai ax80 main cpu mask rom.ic2", 0x000000, 0x001000, CRC(241c078f) SHA1(7f5d0d718f2d03ec446568ae440beaff0aac6bfd) ) + + ROM_REGION(0x2000, "program", 0) // external program EPROM + ROM_SYSTEM_BIOS( 0, "k", "REV.K" ) + ROMX_LOAD( "ax-80k.ic4", 0x000000, 0x002000, CRC(a2f95ccf) SHA1(4e5f2c4c9a08ec1d38146cae786b400261a3dbb7), ROM_BIOS(0) ) + ROM_SYSTEM_BIOS( 1, "l", "REV.L" ) + ROMX_LOAD( "ax-80l.ic4", 0x000000, 0x002000, CRC(bc3d21bd) SHA1(d6730ec33b28e705a0ff88946b7860fadcc37793), ROM_BIOS(1) ) + ROM_SYSTEM_BIOS( 2, "i", "REV.I" ) + ROMX_LOAD( "ax-80i.ic4", 0x000000, 0x002000, CRC(d616e435) SHA1(84820522e6a96fc29966f82e76254e54df15d7e6), ROM_BIOS(2) ) +ROM_END + +} // anonymous namespace + + +CONS( 1984, ax80, 0, 0, ax80, ax80, ax80_state, empty_init, "Akai", "AX80", MACHINE_NOT_WORKING | MACHINE_NO_SOUND ) |