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Diffstat (limited to 'src/mame/drivers/chaos.c')
-rw-r--r-- | src/mame/drivers/chaos.c | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/src/mame/drivers/chaos.c b/src/mame/drivers/chaos.c new file mode 100644 index 00000000000..7c0c72ae3ac --- /dev/null +++ b/src/mame/drivers/chaos.c @@ -0,0 +1,164 @@ +// license:BSD-3-Clause +// 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<generic_terminal_device> m_terminal; + required_shared_ptr<UINT8> m_p_ram; + required_device<cpu_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, "<unknown>", "Chaos 2", MACHINE_NO_SOUND_HW ) |