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|
// license:BSD-3-Clause
// copyright-holders:Miodrag Milanovic, Curt Coder
/*
Omnibyte MSBC-1 Multibus Single Board Computer
PCB Layout
----------
REV B
|-----------------------------------------------------------|
| CN1 CN2 CN3 CN4 SW1 CN5 |
| |
| 3.6864MHz 3.6864MHz ROM1 |
| ROM0 |
| SIO SIO SW3 SW2 |
| PIT |
| 12.5MHz 41256 41256 41256 |
| 41256 41256 41256 |
| 8MHz CPU 41245 41256 |
| |
| 8419 |
| SW4 |
|-|-------------CN6----------------|----|-------CN7-------|-|
|--------------------------------| |-----------------|
Notes:
Relevant IC's shown.
CPU - Motorola MC68000R12
SIO - Mostek MK68564N-5A Serial Input/Output
PIT - Motorola MC68230L10 Parallel Interface/Timer
8419 - National Semiconductor DP8419N DRAM Controller
41256 - Fujitsu MB81256-12 256Kx1 RAM
ROM0 - AMD AM27128ADC 16Kx8 ROM "47-2818-36G1"
ROM1 - AMD AM27128ADC 16Kx8 ROM "47-2818-36G2"
SW1 - push button
SW2 - rotary hex DIP
SW3 - rotary hex DIP
SW4 - DIP8
CN1 -
CN2 -
CN3 -
CN4 -
CN5 -
CN6 -
CN7 -
*/
#include "emu.h"
#include "cpu/m68000/m68000.h"
#include "machine/68230pit.h"
#include "machine/z80sio.h"
#define MC68000R12_TAG "u50"
#define MK68564_0_TAG "u14"
#define MK68564_1_TAG "u15"
#define MC68230L10_TAG "u16"
class msbc1_state : public driver_device
{
public:
msbc1_state(const machine_config &mconfig, device_type type, const char *tag)
: driver_device(mconfig, type, tag)
, m_maincpu(*this, MC68000R12_TAG)
{ }
void msbc1(machine_config &config);
private:
void mem_map(address_map &map);
virtual void machine_reset() override;
required_device<cpu_device> m_maincpu;
};
void msbc1_state::mem_map(address_map &map)
{
map.unmap_value_high();
map(0x000000, 0x5fffff).ram();
map(0xf80000, 0xf87fff).rom().region(MC68000R12_TAG, 0);
map(0xfffa00, 0xfffa3f).rw("sio1", FUNC(mk68564_device::read), FUNC(mk68564_device::write)).umask16(0x00ff);
map(0xfffc00, 0xfffc3f).rw("sio2", FUNC(mk68564_device::read), FUNC(mk68564_device::write)).umask16(0x00ff);
map(0xfffe00, 0xfffe3f).rw("pit", FUNC(pit68230_device::read), FUNC(pit68230_device::write)).umask16(0x00ff);
}
/* Input ports */
static INPUT_PORTS_START( msbc1 )
INPUT_PORTS_END
void msbc1_state::machine_reset()
{
void *ram = m_maincpu->space(AS_PROGRAM).get_write_ptr(0);
uint8_t *rom = memregion(MC68000R12_TAG)->base();
memcpy(ram, rom, 8);
}
void msbc1_state::msbc1(machine_config &config)
{
/* basic machine hardware */
M68000(config, m_maincpu, 12.5_MHz_XTAL);
m_maincpu->set_addrmap(AS_PROGRAM, &msbc1_state::mem_map);
PIT68230(config, "pit", 8_MHz_XTAL);
MK68564(config, "sio1", 8_MHz_XTAL / 2).set_xtal(3.6864_MHz_XTAL);
MK68564(config, "sio2", 8_MHz_XTAL / 2).set_xtal(3.6864_MHz_XTAL);
}
/* ROM definition */
ROM_START( msbc1 )
ROM_REGION16_BE( 0x8000, MC68000R12_TAG, 0 )
ROM_LOAD16_BYTE( "47-2818-36g1.u18", 0x0000, 0x4000, CRC(14f25d47) SHA1(964bc49c1dd9e9680c0d3d89ff3794c5044bea62) )
ROM_LOAD16_BYTE( "47-2818-36g2.u19", 0x0001, 0x4000, CRC(4814b9e1) SHA1(d96cf75084c6588cb33513830c6beeeffc2de853) )
ROM_REGION( 0x100, "plds", 0 )
ROM_LOAD( "p21.1.u22", 0x000, 0x100, NO_DUMP )
ROM_LOAD( "p22.0.u37", 0x000, 0x100, NO_DUMP )
ROM_LOAD( "p23.0.u38", 0x000, 0x100, NO_DUMP )
ROM_LOAD( "p24.0.u43", 0x000, 0x100, NO_DUMP )
ROM_LOAD( "p25.0.u44", 0x000, 0x100, NO_DUMP )
ROM_LOAD( "p26.0.u45", 0x000, 0x100, NO_DUMP )
ROM_LOAD( "p27.0.u46", 0x000, 0x100, NO_DUMP )
ROM_LOAD( "p28.1.u49", 0x000, 0x100, NO_DUMP )
ROM_LOAD( "p29.0.u58", 0x000, 0x100, NO_DUMP )
ROM_LOAD( "p30.0.u60", 0x000, 0x100, NO_DUMP )
ROM_LOAD( "p31.0.u61", 0x000, 0x100, NO_DUMP )
ROM_LOAD( "p32.0.u76", 0x000, 0x100, NO_DUMP )
ROM_END
/* Driver */
// YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS
COMP( 1985, msbc1, 0, 0, msbc1, msbc1, msbc1_state, empty_init, "Omnibyte", "MSBC-1", MACHINE_NOT_WORKING | MACHINE_NO_SOUND | MACHINE_SUPPORTS_SAVE )
|