// license:MAME // copyright-holders:Miodrag Milanovic, Robbbert /*************************************************************************** Chaos2 08/04/2010 Skeleton driver. 19/05/2012 Connected to a terminal, system is usable [Robbbert] This is a homebrew system: http://koo.corpus.cam.ac.uk/chaos/ There are no schematics or manuals, so the results might not be totally accurate. With the DOS config switch turned off, the only accepted input is a line starting with '&'. The actual commands are unknown. With DOS enabled, a large number of commands become available. These are: access, ask, ascdis, bpclr, bpset, close, control, copy, devfive, dir, end, exec, execute, fill, find, goto, if, input, let, list, load, lowercase, memdis, memset, open, port, read, reboot, runhex, run, save, type, typesl, verify. An example is: memdis 0 f Don't try 'fill' - it fills all memory with zeroes, crashing the system. ToDo: - Connect up floppy disk (no info available on this) ****************************************************************************/ #include "emu.h" #include "cpu/s2650/s2650.h" #include "machine/terminal.h" #define TERMINAL_TAG "terminal" class chaos_state : public driver_device { public: chaos_state(const machine_config &mconfig, device_type type, const char *tag) : driver_device(mconfig, type, tag), m_terminal(*this, TERMINAL_TAG), m_p_ram(*this, "p_ram") , m_maincpu(*this, "maincpu") { } DECLARE_READ8_MEMBER(port1e_r); DECLARE_WRITE8_MEMBER(port1f_w); DECLARE_READ8_MEMBER(port90_r); DECLARE_READ8_MEMBER(port91_r); DECLARE_WRITE8_MEMBER(port92_w); DECLARE_WRITE8_MEMBER(kbd_put); UINT8 m_term_data; virtual void machine_reset(); required_device m_terminal; required_shared_ptr m_p_ram; required_device m_maincpu; }; static ADDRESS_MAP_START( chaos_mem, AS_PROGRAM, 8, chaos_state ) ADDRESS_MAP_UNMAP_HIGH AM_RANGE(0x0000, 0x7fff) AM_RAM AM_SHARE("p_ram") ADDRESS_MAP_END static ADDRESS_MAP_START( chaos_io, AS_IO, 8, chaos_state ) ADDRESS_MAP_UNMAP_HIGH AM_RANGE(0x1e, 0x1e) AM_READ(port1e_r) AM_RANGE(0x1f, 0x1f) AM_READWRITE(port90_r, port1f_w) AM_RANGE(0x90, 0x90) AM_READ(port90_r) AM_RANGE(0x91, 0x91) AM_READ(port91_r) AM_RANGE(0x92, 0x92) AM_DEVWRITE(TERMINAL_TAG, generic_terminal_device, write) AM_RANGE(0x101, 0x103) AM_NOP // stops error log filling up while using debug ADDRESS_MAP_END /* Input ports */ static INPUT_PORTS_START( chaos ) PORT_START("CONFIG") PORT_CONFNAME( 0x01, 0x00, "Enable DOS") PORT_CONFSETTING( 0x01, DEF_STR(No)) PORT_CONFSETTING( 0x00, DEF_STR(Yes)) INPUT_PORTS_END // Port 1E - Bit 0 indicates key pressed, Bit 1 indicates ok to output READ8_MEMBER( chaos_state::port1e_r ) { return (m_term_data) ? 1 : 0; } WRITE8_MEMBER( chaos_state::port1f_w ) { // make the output readable on our terminal if (data == 0x09) return; else if (!data) data = 0x24; m_terminal->write(space, 0, data); if (data == 0x0d) m_terminal->write(space, 0, 0x0a); } READ8_MEMBER( chaos_state::port90_r ) { UINT8 ret = m_term_data; m_term_data = 0; return ret; } // Status port // Bit 0 = L use ports 1E & 1F; H use ports 90 & 92 // Bit 3 = key pressed // Bit 7 = ok to output READ8_MEMBER( chaos_state::port91_r ) { UINT8 ret = 0x80 | ioport("CONFIG")->read(); ret |= (m_term_data) ? 8 : 0; return ret; } WRITE8_MEMBER( chaos_state::kbd_put ) { m_term_data = data; } void chaos_state::machine_reset() { // copy the roms into ram UINT8* ROM = memregion("maincpu")->base(); memcpy(m_p_ram, ROM, 0x3000); memcpy(m_p_ram+0x7000, ROM+0x7000, 0x1000); } static MACHINE_CONFIG_START( chaos, chaos_state ) /* basic machine hardware */ MCFG_CPU_ADD("maincpu",S2650, XTAL_1MHz) MCFG_CPU_PROGRAM_MAP(chaos_mem) MCFG_CPU_IO_MAP(chaos_io) /* video hardware */ MCFG_DEVICE_ADD(TERMINAL_TAG, GENERIC_TERMINAL, 0) MCFG_GENERIC_TERMINAL_KEYBOARD_CB(WRITE8(chaos_state, kbd_put)) MACHINE_CONFIG_END /* ROM definition */ ROM_START( chaos ) ROM_REGION( 0x10000, "maincpu", ROMREGION_ERASEFF ) ROM_LOAD( "chaos.001", 0x0000, 0x1000, CRC(3b433e72) SHA1(5b487337d71253d0e64e123f405da9eaf20e87ac)) ROM_LOAD( "chaos.002", 0x1000, 0x1000, CRC(8b0b487f) SHA1(0d167cf3004a81c87446f2f1464e3debfa7284fe)) ROM_LOAD( "chaos.003", 0x2000, 0x1000, CRC(5880db81) SHA1(29b8f1b03c83953f66464ad1fbbfe2e019637ce1)) ROM_LOAD( "chaos.004", 0x7000, 0x1000, CRC(5d6839d6) SHA1(237f52f0780ac2e29d57bf06d0f7a982eb523084)) ROM_END /* Driver */ /* YEAR NAME PARENT COMPAT MACHINE INPUT INIT COMPANY FULLNAME FLAGS */ COMP( 1983, chaos, 0, 0, chaos, chaos, driver_device, 0, "", "Chaos 2", GAME_NO_SOUND_HW )