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Diffstat (limited to 'src/mame/drivers/imsai.cpp')
-rw-r--r--src/mame/drivers/imsai.cpp142
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diff --git a/src/mame/drivers/imsai.cpp b/src/mame/drivers/imsai.cpp
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+// license:BSD-3-Clause
+// copyright-holders:Robbbert
+/***************************************************************************
+
+ Imsai MPU-B. One of the earliest single-board computers on a S100 card.
+
+ 2013-09-11 Skeleton driver.
+
+ Chips used: i8085, i8251, i8253, 3622 fusable prom. XTAL 6MHz
+
+ Press any key to start the monitor program.
+
+ ToDo:
+ - Banking
+ - Dipswitches
+
+****************************************************************************/
+
+#include "emu.h"
+#include "cpu/i8085/i8085.h"
+#include "machine/i8251.h"
+#include "machine/pit8253.h"
+#include "machine/terminal.h"
+
+#define TERMINAL_TAG "terminal"
+
+class imsai_state : public driver_device
+{
+public:
+ imsai_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),
+ m_uart(*this, "uart"),
+ m_pit(*this, "pit")
+ {
+ }
+
+ DECLARE_WRITE8_MEMBER(kbd_put);
+ DECLARE_READ8_MEMBER(keyin_r);
+ DECLARE_READ8_MEMBER(status_r);
+ DECLARE_WRITE8_MEMBER(control_w);
+ DECLARE_WRITE_LINE_MEMBER(write_uart_clock);
+
+private:
+ UINT8 m_term_data;
+ virtual void machine_reset();
+ required_device<cpu_device> m_maincpu;
+ required_device<generic_terminal_device> m_terminal;
+ required_device<i8251_device> m_uart;
+ required_device<pit8253_device> m_pit;
+};
+
+
+static ADDRESS_MAP_START(imsai_mem, AS_PROGRAM, 8, imsai_state)
+ ADDRESS_MAP_UNMAP_HIGH
+ AM_RANGE(0x0000, 0x07ff) AM_ROM AM_REGION("roms", 0)
+ AM_RANGE(0xd000, 0xd0ff) AM_RAM
+ AM_RANGE(0xd100, 0xd103) AM_DEVREADWRITE("pit", pit8253_device, read, write)
+ AM_RANGE(0xd800, 0xdfff) AM_ROM AM_REGION("roms", 0)
+ADDRESS_MAP_END
+
+static ADDRESS_MAP_START(imsai_io, AS_IO, 8, imsai_state)
+ ADDRESS_MAP_UNMAP_HIGH
+ ADDRESS_MAP_GLOBAL_MASK(0xff)
+ AM_RANGE(0x02, 0x02) AM_READ(keyin_r) AM_DEVWRITE(TERMINAL_TAG, generic_terminal_device, write)
+ AM_RANGE(0x03, 0x03) AM_READ(status_r)
+ AM_RANGE(0x04, 0x04) AM_DEVREADWRITE("uart", i8251_device, data_r, data_w)
+ AM_RANGE(0x05, 0x05) AM_DEVREADWRITE("uart", i8251_device, status_r, control_w)
+ AM_RANGE(0x12, 0x12) AM_DEVREADWRITE("uart", i8251_device, data_r, data_w)
+ AM_RANGE(0x13, 0x13) AM_DEVREADWRITE("uart", i8251_device, status_r, control_w)
+ AM_RANGE(0x14, 0x14) AM_READ(keyin_r) AM_DEVWRITE(TERMINAL_TAG, generic_terminal_device, write)
+ AM_RANGE(0x15, 0x15) AM_READ(status_r)
+ AM_RANGE(0xf3, 0xf3) AM_WRITE(control_w)
+ADDRESS_MAP_END
+
+/* Input ports */
+static INPUT_PORTS_START( imsai )
+INPUT_PORTS_END
+
+READ8_MEMBER( imsai_state::keyin_r )
+{
+ UINT8 ret = m_term_data;
+ m_term_data = 0;
+ return ret;
+}
+
+READ8_MEMBER( imsai_state::status_r )
+{
+ return (m_term_data) ? 3 : 1;
+}
+
+WRITE8_MEMBER( imsai_state::kbd_put )
+{
+ m_term_data = data;
+}
+
+WRITE_LINE_MEMBER(imsai_state::write_uart_clock)
+{
+ m_uart->write_txc(state);
+ m_uart->write_rxc(state);
+}
+
+WRITE8_MEMBER( imsai_state::control_w )
+{
+}
+
+void imsai_state::machine_reset()
+{
+ m_term_data = 0;
+}
+
+static MACHINE_CONFIG_START( imsai, imsai_state )
+ /* basic machine hardware */
+ MCFG_CPU_ADD("maincpu",I8085A, XTAL_6MHz)
+ MCFG_CPU_PROGRAM_MAP(imsai_mem)
+ MCFG_CPU_IO_MAP(imsai_io)
+
+ /* video hardware */
+ MCFG_DEVICE_ADD(TERMINAL_TAG, GENERIC_TERMINAL, 0)
+ MCFG_GENERIC_TERMINAL_KEYBOARD_CB(WRITE8(imsai_state, kbd_put))
+
+ /* Devices */
+ MCFG_DEVICE_ADD("uart", I8251, 0)
+
+ MCFG_DEVICE_ADD("pit", PIT8253, 0)
+ MCFG_PIT8253_CLK0(XTAL_6MHz / 3) /* Timer 0: baud rate gen for 8251 */
+ MCFG_PIT8253_OUT0_HANDLER(WRITELINE(imsai_state, write_uart_clock))
+ MCFG_PIT8253_CLK1(XTAL_6MHz / 3) /* Timer 1: user */
+ MCFG_PIT8253_CLK2(XTAL_6MHz / 3) /* Timer 2: user */
+MACHINE_CONFIG_END
+
+/* ROM definition */
+ROM_START( imsai )
+ ROM_REGION( 0x800, "roms", 0 )
+ ROM_LOAD( "vdb-80.rom", 0x0000, 0x0800, CRC(0afc4683) SHA1(a5419aaee00badf339d7c627f50ef8b2538e42e2) )
+ROM_END
+
+/* Driver */
+
+/* YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS */
+COMP( 1978, imsai, 0, 0, imsai, imsai, driver_device, 0, "Imsai", "MPU-B", MACHINE_NOT_WORKING | MACHINE_NO_SOUND_HW )