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adm36.cpp
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adm36.cpp
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// license:BSD-3-Clause
// copyright-holders:AJR
/************************************************************************************************************
Skeleton driver for ADM 36 Video Display Terminal.
The detachable keyboard has not been dumped. It is controlled serially through the PIO.
************************************************************************************************************/
#include "emu.h"
#include "bus/rs232/rs232.h"
#include "cpu/z80/z80.h"
#include "machine/er1400.h"
#include "machine/z80ctc.h"
#include "machine/z80pio.h"
#include "machine/z80sio.h"
#include "video/tms9927.h"
#include "screen.h"
namespace {
class adm36_state : public driver_device
{
public:
adm36_state(const machine_config &mconfig, device_type type, const char *tag)
: driver_device(mconfig, type, tag)
, m_maincpu(*this, "maincpu")
, m_earom(*this, "earom")
, m_vtac(*this, "vtac")
, m_chargen(*this, "chargen")
, m_vram(*this, "vram%u", 0U)
{
}
void adm36(machine_config &config);
protected:
virtual void machine_start() override;
virtual void machine_reset() override;
private:
u32 screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect);
void pio_pa_w(u8 data);
u8 pio_pb_r();
void pio_pb_w(u8 data);
void vsyn_w(int state);
void mem_map(address_map &map);
void io_map(address_map &map);
required_device<z80_device> m_maincpu;
required_device<er1400_device> m_earom;
required_device<crt5037_device> m_vtac;
required_region_ptr<u8> m_chargen;
required_shared_ptr_array<u8, 2> m_vram;
bool m_vsyn = false;
};
u32 adm36_state::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
{
return 0;
}
void adm36_state::machine_start()
{
m_vsyn = false;
save_item(NAME(m_vsyn));
}
void adm36_state::machine_reset()
{
}
void adm36_state::pio_pa_w(u8 data)
{
m_earom->data_w(BIT(data, 0));
}
u8 adm36_state::pio_pb_r()
{
return (m_earom->data_r() ? 0 : 1) | (m_vsyn ? 0x20 : 0);
}
void adm36_state::pio_pb_w(u8 data)
{
m_earom->clock_w(BIT(data, 4));
m_earom->c3_w(BIT(data, 3));
m_earom->c2_w(BIT(data, 2));
m_earom->c1_w(BIT(data, 1));
}
void adm36_state::vsyn_w(int state)
{
m_vsyn = bool(state);
}
void adm36_state::mem_map(address_map &map)
{
map(0x0000, 0x2fff).rom().region("maincpu", 0);
map(0x6000, 0x67ff).ram(); // MK4802J-3 (U76)
map(0xe000, 0xefff).ram().share("vram0"); // 4x MK4118AN-1 (U66-U69)
map(0xf000, 0xffff).ram().share("vram1"); // 4x MK4118AN-1 (U81-U84)
}
void adm36_state::io_map(address_map &map)
{
map.global_mask(0xff);
map(0x00, 0x03).mirror(0x0c).rw("ctc", FUNC(z80ctc_device::read), FUNC(z80ctc_device::write));
map(0x10, 0x13).mirror(0x0c).rw("sio", FUNC(z80sio_device::cd_ba_r), FUNC(z80sio_device::cd_ba_w));
map(0x20, 0x23).mirror(0x0c).rw("pio", FUNC(z80pio_device::read), FUNC(z80pio_device::write));
map(0x40, 0x4f).rw(m_vtac, FUNC(crt5037_device::read), FUNC(crt5037_device::write));
}
static INPUT_PORTS_START(adm36)
INPUT_PORTS_END
static const z80_daisy_config daisy_chain[] =
{
{ "ctc" },
{ "sio" },
{ "pio" },
{ nullptr }
};
void adm36_state::adm36(machine_config &config)
{
Z80(config, m_maincpu, 14.728_MHz_XTAL / 6);
m_maincpu->set_addrmap(AS_PROGRAM, &adm36_state::mem_map);
m_maincpu->set_addrmap(AS_IO, &adm36_state::io_map);
m_maincpu->set_daisy_config(daisy_chain);
z80pio_device &pio(Z80PIO(config, "pio", 14.728_MHz_XTAL / 6));
pio.out_int_callback().set_inputline(m_maincpu, INPUT_LINE_IRQ0);
pio.out_pa_callback().set(FUNC(adm36_state::pio_pa_w));
pio.in_pb_callback().set(FUNC(adm36_state::pio_pb_r));
pio.out_pb_callback().set(FUNC(adm36_state::pio_pb_w));
ER1400(config, m_earom);
//F3870(config, "keybcpu", 3.579545_MHz_XTAL);
z80ctc_device &ctc(Z80CTC(config, "ctc", 14.728_MHz_XTAL / 6));
ctc.intr_callback().set_inputline(m_maincpu, INPUT_LINE_IRQ0);
ctc.set_clk<0>(14.728_MHz_XTAL / 12);
ctc.set_clk<1>(14.728_MHz_XTAL / 12);
ctc.set_clk<2>(14.728_MHz_XTAL / 12);
ctc.set_clk<3>(14.728_MHz_XTAL / 12);
ctc.zc_callback<0>().set("sio", FUNC(z80sio_device::txca_w));
ctc.zc_callback<1>().set("sio", FUNC(z80sio_device::rxca_w));
ctc.zc_callback<2>().set("sio", FUNC(z80sio_device::txcb_w));
ctc.zc_callback<2>().append("sio", FUNC(z80sio_device::rxcb_w));
z80sio_device &sio(Z80SIO(config, "sio", 14.728_MHz_XTAL / 6)); // MK3887N
sio.out_int_callback().set_inputline(m_maincpu, INPUT_LINE_IRQ0);
sio.out_txda_callback().set("modem", FUNC(rs232_port_device::write_txd));
sio.out_rtsa_callback().set("modem", FUNC(rs232_port_device::write_rts));
sio.out_dtra_callback().set("modem", FUNC(rs232_port_device::write_dtr));
sio.out_txdb_callback().set("printer", FUNC(rs232_port_device::write_txd));
sio.out_dtrb_callback().set("printer", FUNC(rs232_port_device::write_rts));
screen_device &screen(SCREEN(config, "screen", SCREEN_TYPE_RASTER));
screen.set_raw(14.728_MHz_XTAL, 936, 0, 720, 262, 0, 240);
//screen.set_raw(24.3_MHz_XTAL, 1548, 0, 1188, 262, 0, 240);
screen.set_screen_update(FUNC(adm36_state::screen_update));
CRT5037(config, m_vtac, 14.728_MHz_XTAL / 9);
m_vtac->set_char_width(9);
m_vtac->set_screen("screen");
m_vtac->vsyn_callback().set(FUNC(adm36_state::vsyn_w));
rs232_port_device &modem(RS232_PORT(config, "modem", default_rs232_devices, nullptr)); // RS-232C, RS-422A or 20mA current loop
modem.rxd_handler().set("sio", FUNC(z80sio_device::rxa_w));
modem.cts_handler().set("sio", FUNC(z80sio_device::ctsa_w));
modem.dcd_handler().set("sio", FUNC(z80sio_device::dcda_w));
modem.dsr_handler().set("pio", FUNC(z80pio_device::pb6_w));
rs232_port_device &printer(RS232_PORT(config, "printer", default_rs232_devices, nullptr));
printer.rxd_handler().set("sio", FUNC(z80sio_device::rxb_w));
printer.cts_handler().set("sio", FUNC(z80sio_device::ctsa_w));
printer.dcd_handler().set("sio", FUNC(z80sio_device::dcda_w));
}
ROM_START(adm36)
ROM_REGION(0x3000, "maincpu", 0)
ROM_LOAD("u71_136261-012.bin", 0x0000, 0x2000, CRC(f08315c7) SHA1(3943a5fc587e690df81aa9694e6e452673ec5513))
ROM_LOAD("u72_131671-015.bin", 0x2000, 0x1000, CRC(c397f4e2) SHA1(21513472fe4237bda8448a2ad85496757d4ece12))
// U73-U75 are empty sockets
ROM_REGION(0x1000, "chargen", 0)
ROM_LOAD("u56.bin", 0x0000, 0x1000, CRC(70e46897) SHA1(85b4360912fc05243b3b2df29bde5a3def94086b))
ROM_END
} // anonymous namespace
COMP(1981, adm36, 0, 0, adm36, adm36, adm36_state, empty_init, "Lear Siegler", "ADM 36 Video Display Terminal", MACHINE_IS_SKELETON)