// license:BSD-3-Clause
// copyright-holders:Robbbert
/***************************************************************************
DG680
2013-01-14 Driver created
All input must be in uppercase.
DG680 (ETI-680), using the DGOS-Z80 operating system.
This is a S100 card.
In some ways, this system is the ancestor of the original Microbee.
No schematic available, most of this is guesswork.
Port 0 is the input from an ascii keyboard.
Port 2 is the cassette interface.
Port 8 controls some kind of memory protection scheme.
The code indicates that B is the page to protect, and
A is the code (0x08 = inhibit; 0x0B = unprotect;
0x0C = enable; 0x0E = protect). There are 256 pages so
each page is 256 bytes.
The clock is controlled by the byte in D80D.
Monitor Commands:
C (compare)*
E (edit)*
F (fill)*
G - Go to address
I - Inhibit CTC
M (move)*
P (clear screen)*
R (read tape)*
S (search)*
T hhmm [ss] - Set the time
W (write tape)*
X - protection status
XC - clear ram
XD - same as X
XE - enable facilities
XF - disable facilities
XP - protect block
XU - unprotect block
Z - go to 0000.
* These commands are identical to the Microbee ones.
ToDo:
- dips
- leds
- need schematic to find out what else is missing
****************************************************************************/
#include "emu.h"
#include "machine/keyboard.h"
#include "machine/z80daisy.h"
#include "cpu/z80/z80.h"
#include "imagedev/cassette.h"
#include "machine/clock.h"
#include "machine/timer.h"
#include "machine/z80ctc.h"
#include "machine/z80pio.h"
#include "bus/s100/s100.h"
#include "bus/s100/dg640.h"
#include "speaker.h"
class dg680_state : public driver_device
{
public:
dg680_state(const machine_config &mconfig, device_type type, const char *tag)
: driver_device(mconfig, type, tag)
, m_maincpu(*this, "maincpu")
, m_cass(*this, "cassette")
, m_pio(*this, "pio")
, m_ctc(*this, "ctc")
, m_clock(*this, "cass_clock")
, m_s100(*this, "s100")
{ }
void dg680(machine_config &config);
private:
DECLARE_READ8_MEMBER(porta_r);
DECLARE_READ8_MEMBER(portb_r);
DECLARE_WRITE8_MEMBER(portb_w);
DECLARE_READ8_MEMBER(port08_r);
DECLARE_WRITE8_MEMBER(port08_w);
DECLARE_WRITE_LINE_MEMBER(kansas_w);
TIMER_DEVICE_CALLBACK_MEMBER(kansas_r);
void kbd_put(u8 data);
void dg680_io(address_map &map);
void dg680_mem(address_map &map);
uint8_t m_pio_b;
uint8_t m_term_data;
uint8_t m_protection[0x100];
virtual void machine_reset() override;
u8 m_cass_data[4];
bool m_cassold, m_cassinbit, m_cassoutbit;
DECLARE_READ8_MEMBER(mem_r);
DECLARE_WRITE8_MEMBER(mem_w);
required_device<cpu_device> m_maincpu;
required_device<cassette_image_device> m_cass;
required_device<z80pio_device> m_pio;
required_device<z80ctc_device> m_ctc;
required_device<clock_device> m_clock;
required_device<s100_bus_device> m_s100;
};
WRITE_LINE_MEMBER( dg680_state::kansas_w )
{
if ((m_cass->get_state() & CASSETTE_MASK_UISTATE) != CASSETTE_RECORD)
return;
u8 twobit = m_cass_data[3] & 15;
if (state)
{
if (twobit == 0)
m_cassold = m_cassoutbit;
if (m_cassold)
m_cass->output(BIT(m_cass_data[3], 0) ? -1.0 : +1.0); // 2400Hz
else
m_cass->output(BIT(m_cass_data[3], 1) ? -1.0 : +1.0); // 1200Hz
m_cass_data[3]++;
}
}
TIMER_DEVICE_CALLBACK_MEMBER( dg680_state::kansas_r )
{
// no tape - set to idle
m_cass_data[1]++;
if (m_cass_data[1] > 32)
{
m_cass_data[1] = 32;
m_cassinbit = 1;
}
if ((m_cass->get_state() & CASSETTE_MASK_UISTATE) != CASSETTE_PLAY)
return;
/* cassette - turn 1200/2400Hz to a bit */
uint8_t cass_ws = (m_cass->input() > +0.04) ? 1 : 0;
if (cass_ws != m_cass_data[0])
{
m_cass_data[0] = cass_ws;
m_cassinbit = (m_cass_data[1] < 12) ? 1 : 0;
m_cass_data[1] = 0;
m_pio->pb0_w(m_cassinbit);
}
}
READ8_MEMBER( dg680_state::mem_r )
{
return m_s100->smemr_r(offset + 0xf000);
}
WRITE8_MEMBER( dg680_state::mem_w )
{
m_s100->mwrt_w(offset + 0xf000, data);
}
void dg680_state::dg680_mem(address_map &map)
{
map.unmap_value_high();
map(0x0000, 0xcfff).ram();
map(0xd000, 0xd7ff).rom();
map(0xd800, 0xefff).ram();
map(0xf000, 0xffff).rw(FUNC(dg680_state::mem_r),FUNC(dg680_state::mem_w));
}
void dg680_state::dg680_io(address_map &map)
{
map.unmap_value_high();
map.global_mask(0xff);
map(0x00, 0x03).rw(m_pio, FUNC(z80pio_device::read_alt), FUNC(z80pio_device::write_alt));
map(0x04, 0x07).rw(m_ctc, FUNC(z80ctc_device::read), FUNC(z80ctc_device::write));
map(0x08, 0x08).rw(FUNC(dg680_state::port08_r), FUNC(dg680_state::port08_w)); //SWP Control and Status
//map(0x09,0x09) parallel input port
// Optional AM9519 Programmable Interrupt Controller (port c = data, port d = control)
//map(0x0c,0x0d).rw("am9519", FUNC(am9519_device::read), FUNC(am9519_device::write));
}
void dg680_state::machine_reset()
{
m_maincpu->set_pc(0xd000);
m_pio_b = 0xFF;
}
// this is a guess there is no information available
static const z80_daisy_config dg680_daisy_chain[] =
{
{ "ctc" },
{ "pio" },
{ 0x00 }
};
/* Input ports */
static INPUT_PORTS_START( dg680 )
INPUT_PORTS_END
void dg680_state::kbd_put(u8 data)
{
if (data == 8)
data = 127; // fix backspace
m_term_data = data;
/* strobe in keyboard data */
m_pio->strobe_a(0);
m_pio->strobe_a(1);
}
READ8_MEMBER( dg680_state::porta_r )
{
uint8_t data = m_term_data;
m_term_data = 0;
return data;
}
READ8_MEMBER( dg680_state::portb_r )
{
return m_pio_b | m_cassinbit;
}
// bit 1 = cassout; bit 2 = motor on
WRITE8_MEMBER( dg680_state::portb_w )
{
if (BIT(m_pio_b ^ data, 2))
m_cass->change_state(BIT(data, 2) ? CASSETTE_MOTOR_ENABLED : CASSETTE_MOTOR_DISABLED, CASSETTE_MASK_MOTOR);
m_pio_b = data & 0xfe;
m_cassoutbit = BIT(data, 1);
}
READ8_MEMBER( dg680_state::port08_r )
{
uint8_t breg = m_maincpu->state_int(Z80_B);
return m_protection[breg];
}
WRITE8_MEMBER( dg680_state::port08_w )
{
uint8_t breg = m_maincpu->state_int(Z80_B);
m_protection[breg] = data;
}
static void dg680_s100_devices(device_slot_interface &device)
{
device.option_add("dg640", S100_DG640);
}
DEVICE_INPUT_DEFAULTS_START(dg680_dg640_f000)
DEVICE_INPUT_DEFAULTS("DSW", 0x1f, 0x1e) // F000-F7FF
DEVICE_INPUT_DEFAULTS_END
void dg680_state::dg680(machine_config &config)
{
SPEAKER(config, "mono").front_center();
/* Cassette */
CASSETTE(config, m_cass);
m_cass->set_default_state(CASSETTE_PLAY | CASSETTE_MOTOR_DISABLED | CASSETTE_SPEAKER_ENABLED);
m_cass->add_route(ALL_OUTPUTS, "mono", 0.05);
TIMER(config, "kansas_r").configure_periodic(FUNC(dg680_state::kansas_r), attotime::from_hz(40000));
CLOCK(config, m_clock, 4'800); // 300 baud x 16(divider) = 4800
m_clock->signal_handler().set(FUNC(dg680_state::kansas_w));
m_clock->signal_handler().append(m_ctc, FUNC(z80ctc_device::trg2));
m_clock->signal_handler().append(m_ctc, FUNC(z80ctc_device::trg3));
/* basic machine hardware */
z80_device& maincpu(Z80(config, m_maincpu, XTAL(8'000'000) / 4));
maincpu.set_addrmap(AS_PROGRAM, &dg680_state::dg680_mem);
maincpu.set_addrmap(AS_IO, &dg680_state::dg680_io);
maincpu.set_daisy_config(dg680_daisy_chain);
/* Keyboard */
generic_keyboard_device &keyb(GENERIC_KEYBOARD(config, "keyb", 0));
keyb.set_keyboard_callback(FUNC(dg680_state::kbd_put));
/* Devices */
Z80CTC(config, m_ctc, XTAL(8'000'000) / 4);
m_ctc->intr_callback().set_inputline(m_maincpu, INPUT_LINE_IRQ0);
m_ctc->set_clk<0>(200);
m_ctc->zc_callback<0>().set(m_ctc, FUNC(z80ctc_device::trg1));
Z80PIO(config, m_pio, XTAL(8'000'000) / 4);
m_pio->out_int_callback().set_inputline(m_maincpu, INPUT_LINE_IRQ0);
m_pio->in_pa_callback().set(FUNC(dg680_state::porta_r));
// OUT_ARDY - this activates to ask for kbd data but not known if actually used
m_pio->in_pb_callback().set(FUNC(dg680_state::portb_r));
m_pio->out_pb_callback().set(FUNC(dg680_state::portb_w));
S100_BUS(config, m_s100, 1_MHz_XTAL);
S100_SLOT(config, "s100:1", dg680_s100_devices, "dg640")
.set_option_device_input_defaults("dg640", DEVICE_INPUT_DEFAULTS_NAME(dg680_dg640_f000));
}
/* ROM definition */
ROM_START( dg680 )
ROM_REGION( 0x10000, "maincpu", 0 )
ROM_LOAD( "dg680.rom", 0xd000, 0x0800, BAD_DUMP CRC(c1aaef6a) SHA1(1508ca8315452edfb984718e795ccbe79a0c0b58) )
ROM_REGION( 0x0020, "proms", 0 )
ROM_LOAD( "82s123.bin", 0x0000, 0x0020, NO_DUMP )
ROM_END
/* Driver */
// YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS
COMP( 1980, dg680, 0, 0, dg680, dg680, dg680_state, empty_init, "David Griffiths", "DG680 with DGOS-Z80 1.4", MACHINE_NO_SOUND_HW )