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+// 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 )