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mice: Boots into monitor now

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- Generate baud rate through 8155 (clock kludge required)
- Factory settings for DSW7 to configure baud rate, data bits and parity
- Hook up Rx and Tx interrupts
This commit is contained in:
AJR 2017-10-22 00:41:30 -04:00
parent d6e3fc2f01
commit 1cd0bbe040
1 changed files with 37 additions and 21 deletions
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58
src/mame/drivers/mice.cpp
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@ -13,15 +13,12 @@ Each CPU has a plugin card with various chips. The usual complement is
The connection to the outside world is via RS232 to a terminal.
No schematic or manuals available. This driver is guesswork.
No schematic available. This driver is guesswork.
There's a mistake in the boot rom: if the test of the 8155 or 8255 fail, it
attempts to write a suitable message to the screen, but as the 8251 hasn't
yet been initialised, it hangs.
After successfully testing the hardware, it goes off waiting for something
to happen, and this is why there's no output to the screen.
****************************************************************************/
@ -30,7 +27,6 @@ to happen, and this is why there's no output to the screen.
#include "machine/i8155.h"
#include "machine/i8251.h"
#include "machine/i8255.h"
#include "machine/clock.h"
#include "bus/rs232/rs232.h"
class mice_state : public driver_device
@ -41,8 +37,6 @@ public:
, m_maincpu(*this, "maincpu")
{ }
DECLARE_READ8_MEMBER(rpt_pc_r);
private:
required_device<cpu_device> m_maincpu;
};
@ -66,13 +60,34 @@ ADDRESS_MAP_END
/* Input ports */
static INPUT_PORTS_START( mice )
PORT_START("BAUD")
PORT_DIPNAME(0x07, 0x02, "Baud Rate") PORT_DIPLOCATION("DSW7:1,2,3")
PORT_DIPSETTING(0x07, "110")
PORT_DIPSETTING(0x06, "150")
PORT_DIPSETTING(0x05, "300")
PORT_DIPSETTING(0x04, "600")
PORT_DIPSETTING(0x03, "1200")
PORT_DIPSETTING(0x02, "2400")
PORT_DIPSETTING(0x01, "4800")
PORT_DIPSETTING(0x00, "9600")
PORT_DIPNAME(0x08, 0x00, "Data Bits") PORT_DIPLOCATION("DSW7:4")
PORT_DIPSETTING(0x00, "7")
PORT_DIPSETTING(0x08, "8")
PORT_DIPNAME(0x30, 0x30, "Parity") PORT_DIPLOCATION("DSW7:5,6")
PORT_DIPSETTING(0x00, DEF_STR(None))
PORT_DIPSETTING(0x30, "Even")
PORT_DIPSETTING(0x10, "Odd")
// "The number of stop bits is permanently set to one; and the communication is full duplex." (manual, p. 6)
INPUT_PORTS_END
// This port presumably connects to dipswitches to set the serial protocol
READ8_MEMBER( mice_state::rpt_pc_r )
{
return 0xef; // select our default rs232 settings
}
static DEVICE_INPUT_DEFAULTS_START( terminal )
DEVICE_INPUT_DEFAULTS( "RS232_RXBAUD", 0xff, RS232_BAUD_2400 )
DEVICE_INPUT_DEFAULTS( "RS232_TXBAUD", 0xff, RS232_BAUD_2400 )
DEVICE_INPUT_DEFAULTS( "RS232_STARTBITS", 0xff, RS232_STARTBITS_1 )
DEVICE_INPUT_DEFAULTS( "RS232_DATABITS", 0xff, RS232_DATABITS_7 )
DEVICE_INPUT_DEFAULTS( "RS232_PARITY", 0xff, RS232_PARITY_EVEN )
DEVICE_INPUT_DEFAULTS( "RS232_STOPBITS", 0xff, RS232_STOPBITS_1 )
DEVICE_INPUT_DEFAULTS_END
static MACHINE_CONFIG_START( mice )
@ -81,23 +96,24 @@ static MACHINE_CONFIG_START( mice )
MCFG_CPU_PROGRAM_MAP(mice_mem)
MCFG_CPU_IO_MAP(mice_io)
/* video hardware */
MCFG_DEVICE_ADD("uart_clock", CLOCK, 153600)
MCFG_CLOCK_SIGNAL_HANDLER(DEVWRITELINE("uart", i8251_device, write_txc))
MCFG_DEVCB_CHAIN_OUTPUT(DEVWRITELINE("uart", i8251_device, write_rxc))
MCFG_DEVICE_ADD("uart", I8251, 0)
MCFG_DEVICE_ADD("uart", I8251, XTAL_6_144MHz / 2)
MCFG_I8251_TXD_HANDLER(DEVWRITELINE("rs232", rs232_port_device, write_txd))
MCFG_I8251_DTR_HANDLER(DEVWRITELINE("rs232", rs232_port_device, write_dtr))
MCFG_I8251_RTS_HANDLER(DEVWRITELINE("rs232", rs232_port_device, write_rts))
MCFG_I8251_TXRDY_HANDLER(INPUTLINE("maincpu", I8085_RST65_LINE))
MCFG_I8251_RXRDY_HANDLER(INPUTLINE("maincpu", I8085_RST75_LINE))
MCFG_RS232_PORT_ADD("rs232", default_rs232_devices, "terminal")
MCFG_RS232_RXD_HANDLER(DEVWRITELINE("uart", i8251_device, write_rxd))
MCFG_RS232_DSR_HANDLER(DEVWRITELINE("uart", i8251_device, write_dsr))
MCFG_RS232_CTS_HANDLER(DEVWRITELINE("uart", i8251_device, write_cts))
MCFG_DEVICE_CARD_DEVICE_INPUT_DEFAULTS("terminal", terminal)
MCFG_DEVICE_ADD("rpt", I8155, XTAL_6_144MHz) // divider is likely to be 2; timer emulation appears faulty
MCFG_I8155_IN_PORTC_CB(IOPORT("BAUD"))
MCFG_I8155_OUT_TIMEROUT_CB(DEVWRITELINE("uart", i8251_device, write_txc))
MCFG_DEVCB_CHAIN_OUTPUT(DEVWRITELINE("uart", i8251_device, write_rxc))
MCFG_DEVICE_ADD("rpt", I8155, 1000) // this value is the timer clock, no idea what it should be.
MCFG_I8155_IN_PORTC_CB(READ8(mice_state, rpt_pc_r))
MCFG_DEVICE_ADD("ppi", I8255, 0)
MACHINE_CONFIG_END
@ -127,4 +143,4 @@ ROM_END
/* Driver */
// YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS
COMP( 1981, mice, 0, 0, mice, mice, mice_state, 0, "Microtek International Inc", "Mice", MACHINE_IS_SKELETON )
COMP( 1981, mice, 0, 0, mice, mice, mice_state, 0, "Microtek International Inc", "Mice", MACHINE_NOT_WORKING | MACHINE_NO_SOUND_HW )