// 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" #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); virtual void machine_reset() override; required_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, 0x1060).mirror(0x000e).rw("kdc", FUNC(i8279_device::data_r), FUNC(i8279_device::data_w)); // IC11 map(0x1061, 0x1061).mirror(0x000e).rw("kdc", FUNC(i8279_device::status_r), FUNC(i8279_device::cmd_w)); // IC11 map(0x1070, 0x1073).mirror(0x000c).rw(PPI1_TAG, FUNC(i8255_device::read), FUNC(i8255_device::write)); // IC10 //AM_RANGE(0x2000, 0x2001) AM_MIRROR(0x0dfe) AM_DEVREADWRITE(PPI0_TAG, i8255_device, read, write) // IC9 - A9 connects to A1-pin //AM_RANGE(0x2200, 0x2201) AM_MIRROR(0x0dfe) AM_DEVREADWRITE(PPI0_TAG, i8255_device, read, write) // IC9 - A9 connects to A1-pin //AM_RANGE(0x3000, 0x3fff) // steers audio to the various voice channels map(0x4000, 0x5fff).mirror(0x2000).rom().region("maincpu", 0x1000); // external program EPROM map(0x8000, 0x87ff).mirror(0x3800).ram(); map(0xc000, 0xc7ff).mirror(0x3800).ram(); } void ax80_state::ax80(machine_config &config) { UPD7810(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(0x3000, "maincpu", 0) // CPU internal mask ROM_LOAD( "akai ax80 main cpu mask rom.ic2", 0x000000, 0x001000, CRC(241c078f) SHA1(7f5d0d718f2d03ec446568ae440beaff0aac6bfd) ) // external program EPROM ROM_SYSTEM_BIOS( 0, "k", "REV.K" ) ROMX_LOAD( "ax-80k.ic4", 0x001000, 0x002000, CRC(a2f95ccf) SHA1(4e5f2c4c9a08ec1d38146cae786b400261a3dbb7), ROM_BIOS(0) ) ROM_SYSTEM_BIOS( 1, "l", "REV.L" ) ROMX_LOAD( "ax-80l.ic4", 0x001000, 0x002000, CRC(bc3d21bd) SHA1(d6730ec33b28e705a0ff88946b7860fadcc37793), ROM_BIOS(1) ) ROM_SYSTEM_BIOS( 2, "i", "REV.I" ) ROMX_LOAD( "ax-80i.ic4", 0x001000, 0x002000, CRC(d616e435) SHA1(84820522e6a96fc29966f82e76254e54df15d7e6), ROM_BIOS(2) ) ROM_END CONS( 1984, ax80, 0, 0, ax80, ax80, ax80_state, empty_init, "Akai", "AX80", MACHINE_NOT_WORKING | MACHINE_NO_SOUND )