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Microkit: It sort of works, but with major issues. (nw)

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Robbbert 2015-11-08 22:08:13 +11:00
parent 15e03e7760
commit 0c2f2f103e
1 changed files with 94 additions and 3 deletions
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97
src/mame/drivers/microkit.c
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@ -6,35 +6,126 @@
http://www.vintagecomputer.net/browse_thread.cfm?id=511
*/
Press CR or LF to get the * prompt.
Commands:
$Pxxxx - Jump to address xxxx
?Mxxxx yyyy - Dump memory starting at xxxx for yyyy bytes
!Mxxxx yy zz... - Write data (yy etc) to memory xxxx. Data gets entered when you
press the space after the data.
There's no sound or storage facilities, therefore no software.
ToDo:
- No technical manual or schematic available, so the entire driver is bodgy guesswork.
- Address 0 needs to be read/writeable, otherwise the numbers you enter will get
internally corrupted.
- Address 8000 is IDL which hangs the system, so program counter is preset to 8001.
- The keyboard is hooked up serially, which is ok, but the output to the terminal
is rubbish, so parallel is used so you can at least see something.
- When you enter commands, you can't see what you're doing.
- When you enter numbers, they display as rubbish or act as control codes. They
internally work though.
- The computer looks like a rack-mount metal box with a rudimentary front panel.
Buttons are: Reset; Load; Run program; Run Utility
There is a RUN LED.
None of these items are emulated.
It also has a power switch and lamp, and a fuse.
*****************************************************************************************/
#include "emu.h"
#include "cpu/cosmac/cosmac.h"
#include "bus/rs232/rs232.h"
#include "machine/terminal.h"
class microkit_state : public driver_device
{
public:
microkit_state(const machine_config &mconfig, device_type type, const char *tag)
: driver_device(mconfig, type, tag)
, m_maincpu(*this, "maincpu")
, m_rs232(*this, "rs232")
, m_terminal(*this, "terminal")
{ }
DECLARE_READ_LINE_MEMBER(clear_r);
DECLARE_WRITE8_MEMBER(ram_w);
DECLARE_READ8_MEMBER(ram_r);
private:
virtual void machine_reset();
UINT8 m_resetcnt;
UINT8 m_ram_data;
required_device<cosmac_device> m_maincpu;
required_device<rs232_port_device> m_rs232;
required_device<generic_terminal_device> m_terminal;
};
static ADDRESS_MAP_START( microkit_mem, AS_PROGRAM, 8, microkit_state )
AM_RANGE(0x0000, 0x01ff) AM_ROM AM_REGION("maincpu", 0)
AM_RANGE(0x0000, 0x0000) AM_READWRITE(ram_r,ram_w)
AM_RANGE(0x8000, 0x81ff) AM_ROM AM_REGION("maincpu", 0)
AM_RANGE(0x8200, 0x83ff) AM_RAM
ADDRESS_MAP_END
static ADDRESS_MAP_START( microkit_io, AS_IO, 8, microkit_state )
AM_RANGE(0x07, 0x07) AM_WRITENOP // writes a lots of zeros here
ADDRESS_MAP_END
static INPUT_PORTS_START( microkit )
INPUT_PORTS_END
READ_LINE_MEMBER( microkit_state::clear_r )
{
if (m_resetcnt < 0x10)
m_maincpu->set_state_int(COSMAC_R0, 0x8001); // skip IDL
if (m_resetcnt < 0x20)
m_resetcnt++;
// set reset pin to normal
return 1;
}
READ8_MEMBER( microkit_state::ram_r )
{
return m_ram_data;
}
WRITE8_MEMBER( microkit_state::ram_w )
{
m_ram_data = data;
if (data > 0 && data < 0x80)
m_terminal->write(space, 0, data);
}
void microkit_state::machine_reset()
{
m_resetcnt = 0;
m_ram_data = 0;
}
static DEVICE_INPUT_DEFAULTS_START( serial_keyb )
DEVICE_INPUT_DEFAULTS( "RS232_TXBAUD", 0xff, RS232_BAUD_300 )
DEVICE_INPUT_DEFAULTS( "RS232_RXBAUD", 0xff, RS232_BAUD_300 )
DEVICE_INPUT_DEFAULTS( "RS232_STARTBITS", 0xff, RS232_STARTBITS_1 )
DEVICE_INPUT_DEFAULTS( "RS232_DATABITS", 0xff, RS232_DATABITS_8 )
DEVICE_INPUT_DEFAULTS( "RS232_PARITY", 0xff, RS232_PARITY_NONE )
DEVICE_INPUT_DEFAULTS( "RS232_STOPBITS", 0xff, RS232_STOPBITS_2 )
DEVICE_INPUT_DEFAULTS_END
static MACHINE_CONFIG_START( microkit, microkit_state )
// basic machine hardware
MCFG_CPU_ADD("maincpu", CDP1801, 2000000)
MCFG_CPU_ADD("maincpu", CDP1802, 1750000)
MCFG_CPU_PROGRAM_MAP(microkit_mem)
MCFG_CPU_IO_MAP(microkit_io)
MCFG_COSMAC_WAIT_CALLBACK(VCC)
MCFG_COSMAC_CLEAR_CALLBACK(READLINE(microkit_state, clear_r))
/* video hardware */
MCFG_RS232_PORT_ADD("rs232", default_rs232_devices, "keyboard")
MCFG_RS232_RXD_HANDLER(DEVWRITELINE("maincpu", cosmac_device, ef4_w))
MCFG_DEVICE_CARD_DEVICE_INPUT_DEFAULTS("keyboard", serial_keyb)
MCFG_DEVICE_ADD("terminal", GENERIC_TERMINAL, 0)
MACHINE_CONFIG_END
ROM_START( microkit )