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// license:MAME
// copyright-holders:Robbbert
/***************************************************************************
Skeleton driver for 68k Single Board Computer
29/03/2011
http://www.kmitl.ac.th/~kswichit/68k/68k.html
TODO:
- Add RTC (type DS12887)
All of the address and i/o decoding is done by a pair of XC9536
mask-programmed custom devices.
There are some chips used for unclear purposes (GPI, GPO, LCD).
This computer has no sound, and no facility for saving or loading programs.
When started, press ? key for a list of commands.
Has 1MB of flash (which is actually just 12k of program),
and 1MB of RAM. Memory map should probably be corrected.
****************************************************************************/
#include "bus/rs232/rs232.h"
#include "cpu/m68000/m68000.h"
#include "machine/6850acia.h"
#include "machine/clock.h"
class c68ksbc_state : public driver_device
{
public:
c68ksbc_state(const machine_config &mconfig, device_type type, const char *tag) :
driver_device(mconfig, type, tag),
m_maincpu(*this, "maincpu"),
m_acia(*this, "acia")
{
}
DECLARE_WRITE_LINE_MEMBER(write_acia_clock);
private:
required_device<cpu_device> m_maincpu;
required_device<acia6850_device> m_acia;
};
static ADDRESS_MAP_START(c68ksbc_mem, AS_PROGRAM, 16, c68ksbc_state)
ADDRESS_MAP_UNMAP_HIGH
AM_RANGE(0x000000, 0x002fff) AM_ROM
AM_RANGE(0x003000, 0x5fffff) AM_RAM
AM_RANGE(0x600000, 0x600001) AM_DEVREADWRITE8("acia", acia6850_device, status_r, control_w, 0x00ff)
AM_RANGE(0x600002, 0x600003) AM_DEVREADWRITE8("acia", acia6850_device, data_r, data_w, 0x00ff)
ADDRESS_MAP_END
/* Input ports */
static INPUT_PORTS_START( c68ksbc )
INPUT_PORTS_END
WRITE_LINE_MEMBER(c68ksbc_state::write_acia_clock)
{
m_acia->write_txc(state);
m_acia->write_rxc(state);
}
static MACHINE_CONFIG_START( c68ksbc, c68ksbc_state )
/* basic machine hardware */
MCFG_CPU_ADD("maincpu", M68000, 8000000) // text says 8MHz, schematic says 10MHz
MCFG_CPU_PROGRAM_MAP(c68ksbc_mem)
MCFG_DEVICE_ADD("acia", ACIA6850, 0)
MCFG_ACIA6850_TXD_HANDLER(DEVWRITELINE("rs232", rs232_port_device, write_txd))
MCFG_ACIA6850_RTS_HANDLER(DEVWRITELINE("rs232", rs232_port_device, write_rts))
MCFG_RS232_PORT_ADD("rs232", default_rs232_devices, "terminal")
MCFG_RS232_RXD_HANDLER(DEVWRITELINE("acia", acia6850_device, write_rxd))
MCFG_RS232_CTS_HANDLER(DEVWRITELINE("acia", acia6850_device, write_cts))
MCFG_DEVICE_ADD("acia_clock", CLOCK, 153600)
MCFG_CLOCK_SIGNAL_HANDLER(WRITELINE(c68ksbc_state, write_acia_clock))
MACHINE_CONFIG_END
/* ROM definition */
ROM_START( 68ksbc )
ROM_REGION(0x1000000, "maincpu", 0)
ROM_LOAD( "t68k.bin", 0x0000, 0x2f78, CRC(20a8d0d0) SHA1(544fd8bd8ed017115388c8b0f7a7a59a32253e43) )
ROM_END
/* Driver */
/* YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS */
COMP( 2002, 68ksbc, 0, 0, c68ksbc, c68ksbc, driver_device, 0, "Ichit Sirichote", "68k Single Board Computer", GAME_NO_SOUND_HW)
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