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-// license:BSD-3-Clause
-// copyright-holders:R. Belmont
-/***************************************************************************
-
- prophet600.cpp - Sequential Circuits Prophet-600, designed by Dave Smith
-
- This was the first commercial synthesizer with built-in MIDI.
-
- Skeleton driver by R. Belmont
-
- Hardware:
- CPU: Z80 CPU + 8253 PIT + 6850 UART
-
- Memory map:
- 0x0000-0x1fff: ROM
- 0x2000-0x27ff: RAM 1
- 0x3000-0x37ff: RAM 2
- 0x4000-0x4001: DAC for CV/gate drive
- 0x6000-0x6001: 6850 writes
- 0xe000-0xe001: 6850 reads
-
- I/O map:
- 00-07: 8253 PIT
- 08: set row to scan for keyboard/panel input and LED / lamp output
- 09: read: analog comparitor, some value vs. the DAC. write: output for LEDs/lamps
- comparitor bits:
- bit 1: FFFStatus
- bit 2: output of 8253 channel 2
- bit 3: ADCCompare: returns sign of if current value is > or < the DAC value
-
- 0a: read: keyboard/panel input scan bits, write: select a pot on the panel for the comparitor
- 0b: write: update all gate signals
- 0c: ???
- 0d: write: select which CV signal will be updated with the current DAC value
- 0e: write: mask, masks
- bit 0: FFFP -FF P
- bit 1: mask gate from 8253
- bit 3: FFFD FF D
- bit 4: FFFCL -FF CL
-
-
- Info:
- - Prophet 600 Technical Manual
-
- - https://github.com/gligli/p600fw - GPLv3 licensed complete replacement firmware
- for the Prophet 600, but written in C and runs on an AVR that replaces the original
- Z80.
-
-***************************************************************************/
-
-#include "emu.h"
-#include "machine/clock.h"
-#include "cpu/z80/z80.h"
-#include "bus/midi/midi.h"
-#include "machine/6850acia.h"
-#include "machine/pit8253.h"
-
-#include "prophet600.lh"
-
-#define MAINCPU_TAG "z80"
-#define PIT_TAG "pit"
-#define UART_TAG "uart"
-
-enum
-{
- CV_CV_Osc1A = 0, CV_Osc2A, CV_Osc3A, CV_Osc4A, CV_Osc5A, CV_Osc6A,
- CV_Osc1B, CV_Osc2B, CV_Osc3B, CV_Osc4B, CV_Osc5B, CV_Osc6B,
- CV_Flt1, CV_Flt2, CV_Flt3, CV_Flt4, CV_Flt5, CV_Flt6,
- CV_Amp1, CV_Amp2, CV_Amp3, CV_Amp4, CV_Amp5, CV_Amp6,
- CV_PModOscB, CV_VolA, CV_VolB, CV_MasterVol, CV_APW, CV_ExtFilter, CV_Resonance, CV_BPW,
-
- CV_MAX
-};
-
-class prophet600_state : public driver_device
-{
-public:
- prophet600_state(const machine_config &mconfig, device_type type, const char *tag)
- : driver_device(mconfig, type, tag),
- m_maincpu(*this, MAINCPU_TAG),
- m_acia(*this, UART_TAG),
- m_digits(*this, "digit%u", 0U),
- m_dac(0),
- m_scanrow(0),
- m_comparitor(0),
- m_nmi_gate(false)
- { }
-
- void prophet600(machine_config &config);
-
-private:
- virtual void machine_start() override;
-
- DECLARE_WRITE_LINE_MEMBER( pit_ch0_tick_w );
- DECLARE_WRITE_LINE_MEMBER( pit_ch2_tick_w );
- DECLARE_WRITE_LINE_MEMBER( acia_irq_w );
- DECLARE_WRITE_LINE_MEMBER( acia_clock_w );
-
- DECLARE_WRITE8_MEMBER(dac_w);
- DECLARE_WRITE8_MEMBER(scanrow_w);
- DECLARE_WRITE8_MEMBER(led_w);
- DECLARE_READ8_MEMBER(scan_r);
- DECLARE_WRITE8_MEMBER(potmux_w);
- DECLARE_READ8_MEMBER(comparitor_r);
- DECLARE_WRITE8_MEMBER(mask_w);
- DECLARE_WRITE8_MEMBER(cv_w);
- DECLARE_WRITE8_MEMBER(gate_w);
-
- void cpu_map(address_map &map);
- void io_map(address_map &map);
-
- required_device<cpu_device> m_maincpu;
- required_device<acia6850_device> m_acia;
-
- output_finder<2> m_digits;
-
- uint16_t m_dac;
- uint8_t m_scanrow;
- uint8_t m_comparitor;
-
- bool m_nmi_gate;
-
- // gates
- bool m_ASaw, m_ATri, m_Sync, m_BSaw, m_BTri, m_PModFA, m_PModFil;
-
- // control voltages
- uint16_t m_CVs[CV_MAX];
-};
-
-WRITE_LINE_MEMBER( prophet600_state::pit_ch0_tick_w )
-{
- m_maincpu->set_input_line(INPUT_LINE_IRQ0, state);
-}
-
-WRITE_LINE_MEMBER( prophet600_state::pit_ch2_tick_w )
-{
- m_comparitor &= ~0x04;
- m_comparitor |= (state == ASSERT_LINE) ? 0x04 : 0x00;
-}
-
-WRITE_LINE_MEMBER( prophet600_state::acia_irq_w )
-{
- if (!m_nmi_gate)
- {
- m_maincpu->set_input_line(INPUT_LINE_NMI, state);
- }
-}
-
-WRITE_LINE_MEMBER( prophet600_state::acia_clock_w )
-{
- m_acia->write_txc(state);
- m_acia->write_rxc(state);
-}
-
-WRITE8_MEMBER( prophet600_state::dac_w )
-{
- if (offset)
- {
- m_dac &= 0xff;
- m_dac |= (data<<8);
- return;
- }
-
- m_dac &= 0xff00;
- m_dac |= data;
-}
-
-// also selects LEDs and keyboard keys to check
-WRITE8_MEMBER(prophet600_state::scanrow_w)
-{
- m_scanrow = data;
-}
-
-// scanrow 0x10 = LEDs, 0x20 = 7-segment #1, 0x40 = 7-segment #2
-WRITE8_MEMBER(prophet600_state::led_w)
-{
- if (m_scanrow & 0x10)
- {
- // LEDs in row 0x10 are Seq1=0, Seq2=1, ArpUD=2, ArpAssign=3, Preset=4, Record=5, ToTape=6, FromTape=7
- }
- else if (m_scanrow & 0x20)
- {
- m_digits[0] = data;
- }
- else if (m_scanrow & 0x40)
- {
- m_digits[1] = data;
- }
-}
-
-READ8_MEMBER(prophet600_state::scan_r)
-{
- return 0;
-}
-
-WRITE8_MEMBER(prophet600_state::mask_w)
-{
- m_nmi_gate = (data & 0x02) ? true : false;
- if (m_nmi_gate) // gate is set, comparitor line is pulled up to Vcc
- {
- m_comparitor |= 0x04;
- }
- else
- {
- m_comparitor &= ~0x04;
- }
-
-// printf("8253 gate = %x\n", data & 0x02);
-}
-
-WRITE8_MEMBER(prophet600_state::cv_w)
-{
- int cvnum = data & 7;
-
- if (!(cvnum & 0x08)) m_CVs[cvnum] = m_dac;
- if (!(cvnum & 0x10)) m_CVs[cvnum+8] = m_dac;
- if (!(cvnum & 0x20)) m_CVs[cvnum+16] = m_dac;
- if (!(cvnum & 0x40)) m_CVs[cvnum+24] = m_dac;
-}
-
-WRITE8_MEMBER(prophet600_state::gate_w)
-{
- m_ASaw = (data & 0x01);
- m_ATri = (data & 0x02);
- m_Sync = (data & 0x04);
- m_BSaw = (data & 0x08);
- m_BTri = (data & 0x10);
- m_PModFA = (data & 0x20);
- m_PModFil = (data & 0x40);
-}
-
-/* Pots: Mixer=0,Cutoff=1,Resonance=2,FilEnvAmt=3,FilRel=4,FilSus=5,
- FilDec=6,FilAtt=7,AmpRel=8,AmpSus=9,AmpDec=10,AmpAtt=11,
- Glide=12,BPW=13,MVol=14,MTune=15,PitchWheel=16,ModWheel=22,
- Speed,APW,PModFilEnv,LFOFreq,PModOscB,LFOAmt,FreqB,FreqA,FreqBFine
-*/
-WRITE8_MEMBER(prophet600_state::potmux_w)
-{
-}
-
-READ8_MEMBER(prophet600_state::comparitor_r)
-{
-// m_comparitor ^= 0x04;
- return m_comparitor;
-}
-
-void prophet600_state::cpu_map(address_map &map)
-{
- map(0x0000, 0x1fff).rom().region(MAINCPU_TAG, 0);
- map(0x2000, 0x27ff).ram();
- map(0x3000, 0x37ff).ram();
- map(0x4000, 0x4001).w(FUNC(prophet600_state::dac_w));
- map(0x6000, 0x6001).w(m_acia, FUNC(acia6850_device::write));
- map(0xe000, 0xe001).r(m_acia, FUNC(acia6850_device::read));
-}
-
-void prophet600_state::io_map(address_map &map)
-{
- map(0x00, 0x07).mirror(0xff00).rw(PIT_TAG, FUNC(pit8253_device::read), FUNC(pit8253_device::write));
- map(0x08, 0x08).mirror(0xff00).w(FUNC(prophet600_state::scanrow_w));
- map(0x09, 0x09).mirror(0xff00).rw(FUNC(prophet600_state::comparitor_r), FUNC(prophet600_state::led_w));
- map(0x0a, 0x0a).mirror(0xff00).rw(FUNC(prophet600_state::scan_r), FUNC(prophet600_state::potmux_w));
- map(0x0b, 0x0b).mirror(0xff00).w(FUNC(prophet600_state::gate_w));
- map(0x0d, 0x0d).mirror(0xff00).w(FUNC(prophet600_state::cv_w));
- map(0x0e, 0x0e).mirror(0xff00).w(FUNC(prophet600_state::mask_w));
-}
-
-void prophet600_state::machine_start()
-{
- m_digits.resolve();
-}
-
-// master crystal is 8 MHz, all clocks derived from there
-void prophet600_state::prophet600(machine_config &config)
-{
- Z80(config, m_maincpu, XTAL(8'000'000)/2);
- m_maincpu->set_addrmap(AS_PROGRAM, &prophet600_state::cpu_map);
- m_maincpu->set_addrmap(AS_IO, &prophet600_state::io_map);
-
- config.set_default_layout(layout_prophet600);
-
- pit8253_device &pit8253(PIT8253(config, PIT_TAG, XTAL(8'000'000)/4));
- pit8253.set_clk<0>(XTAL(8'000'000)/4);
- pit8253.set_clk<1>(XTAL(8'000'000)/4);
- pit8253.set_clk<2>(XTAL(8'000'000)/4);
- pit8253.out_handler<0>().set(FUNC(prophet600_state::pit_ch0_tick_w));
- pit8253.out_handler<2>().set(FUNC(prophet600_state::pit_ch2_tick_w));
-
- ACIA6850(config, m_acia, 0);
- m_acia->txd_handler().set("mdout", FUNC(midi_port_device::write_txd));
- m_acia->irq_handler().set(FUNC(prophet600_state::acia_irq_w));
-
- MIDI_PORT(config, "mdin", midiin_slot, "midiin").rxd_handler().set(m_acia, FUNC(acia6850_device::write_rxd));
-
- MIDI_PORT(config, "mdout", midiout_slot, "midiout");
-
- clock_device &acia_clock(CLOCK(config, "acia_clock", XTAL(8'000'000)/16)); // 500kHz = 16 times the MIDI rate
- acia_clock.signal_handler().set(FUNC(prophet600_state::acia_clock_w));
-}
-
-static INPUT_PORTS_START( prophet600 )
-INPUT_PORTS_END
-
-ROM_START( prpht600 )
- ROM_REGION(0x2000, MAINCPU_TAG, 0)
- ROM_LOAD( "p600.bin", 0x000000, 0x002000, CRC(78e3f048) SHA1(61548b6de3d9b5c0ae76f8e751ece0b57de17118) )
-ROM_END
-
-CONS( 1983, prpht600, 0, 0, prophet600, prophet600, prophet600_state, empty_init, "Sequential Circuits", "Prophet-600", MACHINE_NOT_WORKING|MACHINE_NO_SOUND )