/
mx2178.cpp
201 lines (166 loc) · 7.36 KB
/
mx2178.cpp
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// license:BSD-3-Clause
// copyright-holders:Robbbert
/***************************************************************************************************
Skeleton driver for Memorex 2178
Chips: Z80A, N8X305N, 2x B8452A, 4x D4016C-3, 2x HD468A50P, HD46505SP-1
Crystal: 18.8696MHz
There is a large piezo-beeper.
TODO:
- Connect up the beeper
- Unknown memory i/o C000, 4000
- Need schematic / tech manual
- Doesn't seem to be any dips, looks like all settings and modes are controlled by keystrokes.
- 8X305 is a 16-bit bipolar processor which appears to use four external PROMs (undumped). It
would communicate with the Z80 via a common 8-bit I/O bus. No idea what it is used for here,
but in another system it acts as the floppy disk controller.
- Debug trick: set pc=809 to see the test menu.
- It shows the status line but keystrokes are ignored. After 20 minutes of inactivity, the screen
goes blank. Pressing a key will restore it.
***************************************************************************************************/
#include "emu.h"
#include "cpu/z80/z80.h"
//#include "cpu/8x300/8x300.h" // device = N8X300
#include "machine/6850acia.h"
#include "bus/rs232/rs232.h"
#include "machine/clock.h"
#include "video/mc6845.h"
#include "emupal.h"
#include "screen.h"
namespace {
class mx2178_state : public driver_device
{
public:
mx2178_state(const machine_config &mconfig, device_type type, const char *tag)
: driver_device(mconfig, type, tag)
, m_palette(*this, "palette")
, m_p_videoram(*this, "videoram")
, m_maincpu(*this, "maincpu")
, m_p_chargen(*this, "chargen")
{ }
void mx2178(machine_config &config);
private:
MC6845_UPDATE_ROW(crtc_update_row);
void io_map(address_map &map);
void mem_map(address_map &map);
virtual void machine_reset() override;
required_device<palette_device> m_palette;
required_shared_ptr<u8> m_p_videoram;
required_device<z80_device> m_maincpu;
required_region_ptr<u8> m_p_chargen;
};
void mx2178_state::mem_map(address_map &map)
{
map.unmap_value_high();
map(0x0000, 0x1fff).rom().region("roms", 0);
map(0x2000, 0x27ff).ram().share("videoram");
map(0x6000, 0x6fff).ram();
map(0xe000, 0xe7ff).ram();
}
void mx2178_state::io_map(address_map &map)
{
map.global_mask(0xff);
map(0x00, 0x00).rw("crtc", FUNC(mc6845_device::status_r), FUNC(mc6845_device::address_w));
map(0x01, 0x01).rw("crtc", FUNC(mc6845_device::register_r), FUNC(mc6845_device::register_w));
map(0x80, 0x81).rw("acia1", FUNC(acia6850_device::read), FUNC(acia6850_device::write));
map(0xa0, 0xa1).rw("acia2", FUNC(acia6850_device::read), FUNC(acia6850_device::write));
}
/* Input ports */
static INPUT_PORTS_START( mx2178 )
INPUT_PORTS_END
MC6845_UPDATE_ROW( mx2178_state::crtc_update_row )
{
rgb_t const *const pens = m_palette->palette()->entry_list_raw();
uint32_t *p = &bitmap.pix(y);
for (uint16_t x = 0; x < x_count; x++)
{
uint16_t mem = (ma + x) & 0x7ff;
uint8_t chr = m_p_videoram[mem];
/* get pattern of pixels for that character scanline */
uint8_t gfx = m_p_chargen[(chr<<4) | ra] ^ ((x == cursor_x) ? 0xff : 0);
/* Display a scanline of a character (8 pixels) */
*p++ = pens[BIT(gfx, 7)];
*p++ = pens[BIT(gfx, 6)];
*p++ = pens[BIT(gfx, 5)];
*p++ = pens[BIT(gfx, 4)];
*p++ = pens[BIT(gfx, 3)];
*p++ = pens[BIT(gfx, 2)];
*p++ = pens[BIT(gfx, 1)];
*p++ = pens[BIT(gfx, 0)];
}
}
/* F4 Character Displayer */
static const gfx_layout charlayout =
{
8, 16, /* 8 x 16 characters */
256, /* 256 characters */
1, /* 1 bits per pixel */
{ 0 }, /* no bitplanes */
/* x offsets */
{ 0, 1, 2, 3, 4, 5, 6, 7 },
/* y offsets */
{ 3*8, 4*8, 5*8, 6*8, 7*8, 8*8, 9*8, 10*8, 11*8, 12*8, 13*8 },
8*16 /* every char takes 8 bytes */
};
static GFXDECODE_START( gfx_mx2178 )
GFXDECODE_ENTRY( "chargen", 0x0000, charlayout, 0, 1 )
GFXDECODE_END
void mx2178_state::machine_reset()
{
}
void mx2178_state::mx2178(machine_config &config)
{
/* basic machine hardware */
Z80(config, m_maincpu, XTAL(18'869'600) / 5); // guess
m_maincpu->set_addrmap(AS_PROGRAM, &mx2178_state::mem_map);
m_maincpu->set_addrmap(AS_IO, &mx2178_state::io_map);
/* video hardware */
screen_device &screen(SCREEN(config, "screen", SCREEN_TYPE_RASTER, rgb_t::green()));
screen.set_refresh_hz(60);
screen.set_vblank_time(ATTOSECONDS_IN_USEC(2500)); // not correct
screen.set_screen_update("crtc", FUNC(mc6845_device::screen_update));
screen.set_size(32*8, 32*8);
screen.set_visarea(0*8, 32*8-1, 2*8, 30*8-1);
GFXDECODE(config, "gfxdecode", m_palette, gfx_mx2178);
PALETTE(config, m_palette, palette_device::MONOCHROME);
/* Devices */
mc6845_device &crtc(MC6845(config, "crtc", XTAL(18'869'600) / 8)); // clk unknown
crtc.set_screen("screen");
crtc.set_show_border_area(false);
crtc.set_char_width(8);
crtc.set_update_row_callback(FUNC(mx2178_state::crtc_update_row));
crtc.out_vsync_callback().set_inputline(m_maincpu, INPUT_LINE_NMI);
clock_device &acia_clock(CLOCK(config, "acia_clock", XTAL(18'869'600) / 30));
acia_clock.signal_handler().set("acia1", FUNC(acia6850_device::write_txc));
acia_clock.signal_handler().append("acia1", FUNC(acia6850_device::write_rxc));
acia_clock.signal_handler().append("acia2", FUNC(acia6850_device::write_txc));
acia_clock.signal_handler().append("acia2", FUNC(acia6850_device::write_rxc));
acia6850_device &acia1(ACIA6850(config, "acia1", 0));
acia1.txd_handler().set("rs232a", FUNC(rs232_port_device::write_txd));
acia1.rts_handler().set("rs232a", FUNC(rs232_port_device::write_rts));
acia1.irq_handler().set_inputline(m_maincpu, INPUT_LINE_IRQ0);
rs232_port_device &rs232a(RS232_PORT(config, "rs232a", default_rs232_devices, nullptr));
rs232a.rxd_handler().set("acia1", FUNC(acia6850_device::write_rxd));
rs232a.cts_handler().set("acia1", FUNC(acia6850_device::write_cts));
acia6850_device &acia2(ACIA6850(config, "acia2", 0));
acia2.txd_handler().set("rs232b", FUNC(rs232_port_device::write_txd));
acia2.rts_handler().set("rs232b", FUNC(rs232_port_device::write_rts));
acia2.irq_handler().set_inputline(m_maincpu, INPUT_LINE_IRQ0);
rs232_port_device &rs232b(RS232_PORT(config, "rs232b", default_rs232_devices, "keyboard"));
rs232b.rxd_handler().set("acia2", FUNC(acia6850_device::write_rxd));
rs232b.cts_handler().set("acia2", FUNC(acia6850_device::write_cts));
}
/* ROM definition */
ROM_START( mx2178 )
ROM_REGION(0x2000, "roms", 0) // MBM2764-25
ROM_LOAD( "96274139.u9", 0x000000, 0x002000, CRC(eb471a27) SHA1(433abefd1a72653d0bf35bcaaeccf9943b96260b) )
ROM_REGION(0x800, "proms", 0) // MB7122E - actual mapping not known
ROMX_LOAD( "96270350.q2", 0x0000, 0x0400, NO_DUMP, ROM_NIBBLE | ROM_SHIFT_NIBBLE_LO | ROM_SKIP(1) )
ROMX_LOAD( "96270368.r2", 0x0000, 0x0400, NO_DUMP, ROM_NIBBLE | ROM_SHIFT_NIBBLE_HI | ROM_SKIP(1) )
ROMX_LOAD( "96270376.s2", 0x0001, 0x0400, NO_DUMP, ROM_NIBBLE | ROM_SHIFT_NIBBLE_LO | ROM_SKIP(1) )
ROMX_LOAD( "96270384.t2", 0x0001, 0x0400, NO_DUMP, ROM_NIBBLE | ROM_SHIFT_NIBBLE_HI | ROM_SKIP(1) )
ROM_REGION(0x1000, "chargen", 0) // D2732A-3
ROM_LOAD( "96273883.c7", 0x000000, 0x001000, CRC(8311fadd) SHA1(573bbad23e893ad9374edc929642dc1cba3452d2) )
ROM_END
} // Anonymous namespace
// YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS
COMP( 1984, mx2178, 0, 0, mx2178, mx2178, mx2178_state, empty_init, "Memorex", "Memorex 2178", MACHINE_IS_SKELETON | MACHINE_SUPPORTS_SAVE )