// license:BSD-3-Clause // 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 "emu.h" #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") { } void c68ksbc(machine_config &config); private: void c68ksbc_mem(address_map &map); required_device m_maincpu; }; void c68ksbc_state::c68ksbc_mem(address_map &map) { map.unmap_value_high(); map(0x000000, 0x002fff).rom(); map(0x003000, 0x5fffff).ram(); map(0x600000, 0x600003).rw("acia", FUNC(acia6850_device::read), FUNC(acia6850_device::write)).umask16(0x00ff); } /* Input ports */ static INPUT_PORTS_START( c68ksbc ) INPUT_PORTS_END void c68ksbc_state::c68ksbc(machine_config &config) { M68000(config, m_maincpu, 8000000); // text says 8MHz, schematic says 10MHz m_maincpu->set_addrmap(AS_PROGRAM, &c68ksbc_state::c68ksbc_mem); acia6850_device &acia(ACIA6850(config, "acia", 0)); acia.txd_handler().set("rs232", FUNC(rs232_port_device::write_txd)); acia.rts_handler().set("rs232", FUNC(rs232_port_device::write_rts)); rs232_port_device &rs232(RS232_PORT(config, "rs232", default_rs232_devices, "terminal")); rs232.rxd_handler().set("acia", FUNC(acia6850_device::write_rxd)); rs232.cts_handler().set("acia", FUNC(acia6850_device::write_cts)); clock_device &acia_clock(CLOCK(config, "acia_clock", 153600)); acia_clock.signal_handler().set("acia", FUNC(acia6850_device::write_txc)); acia_clock.signal_handler().append("acia", FUNC(acia6850_device::write_rxc)); } /* 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, c68ksbc_state, empty_init, "Wichit Sirichote", "68k Single Board Computer", MACHINE_NO_SOUND_HW)