/*************************************************************************** Skeleton driver for 68k Single Board Computer 29/03/2011 http://www.kmitl.ac.th/~kswichit/68k/68k.html TODO: - Add RTC (type DS12887) - Add UART (type mc6850) 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 "cpu/m68000/m68000.h" #include "machine/terminal.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_terminal(*this, TERMINAL_TAG) { } required_device m_maincpu; required_device m_terminal; DECLARE_READ16_MEMBER( c68ksbc_status_r ); DECLARE_READ16_MEMBER( c68ksbc_terminal_r ); DECLARE_WRITE8_MEMBER( kbd_put ); UINT8 m_term_data; virtual void machine_reset(); }; //bit 0 high = a key is ready; bit 1 high = ready to output to terminal READ16_MEMBER( c68ksbc_state::c68ksbc_status_r ) { return (m_term_data) ? 3 : 2; } READ16_MEMBER( c68ksbc_state::c68ksbc_terminal_r ) { UINT8 ret = m_term_data; m_term_data = 0; return ret; } 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_READ(c68ksbc_status_r) AM_RANGE(0x600002, 0x600003) AM_READ(c68ksbc_terminal_r) AM_DEVWRITE8(TERMINAL_TAG, generic_terminal_device, write, 0xff) ADDRESS_MAP_END /* Input ports */ static INPUT_PORTS_START( c68ksbc ) INPUT_PORTS_END void c68ksbc_state::machine_reset() { m_term_data = 0; } WRITE8_MEMBER( c68ksbc_state::kbd_put ) { m_term_data = data; } static GENERIC_TERMINAL_INTERFACE( terminal_intf ) { DEVCB_DRIVER_MEMBER(c68ksbc_state, kbd_put) }; 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_GENERIC_TERMINAL_ADD(TERMINAL_TAG, terminal_intf) 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 INIT COMPANY FULLNAME FLAGS */ COMP( 2002, 68ksbc, 0, 0, c68ksbc, c68ksbc, driver_device, 0, "Ichit Sirichote", "68k Single Board Computer", GAME_NO_SOUND_HW)