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// license:MAME
// copyright-holders:Miodrag Milanovic, Robbbert
/***************************************************************************
MITS Altair 8800b Turnkey
04/12/2009 Initial driver by Miodrag Milanovic
Commands:
All commands must be in uppercase. Address and data is
specified in Octal format (not hex).
Press space to input your command line (not return).
D - Memory Dump
J - Jump to address
M - Modify memory
****************************************************************************/
#include "bus/rs232/rs232.h"
#include "cpu/i8085/i8085.h"
#include "machine/6850acia.h"
#include "machine/clock.h"
#include "imagedev/snapquik.h"
class altair_state : public driver_device
{
public:
altair_state(const machine_config &mconfig, device_type type, const char *tag) :
driver_device(mconfig, type, tag),
m_maincpu(*this, "maincpu"),
m_mc6850(*this, "mc6850"),
m_ram(*this, "ram")
{
}
DECLARE_QUICKLOAD_LOAD_MEMBER(altair);
DECLARE_WRITE_LINE_MEMBER(write_acia_clock);
protected:
virtual void machine_reset();
private:
required_device<cpu_device> m_maincpu;
required_device<acia6850_device> m_mc6850;
required_shared_ptr<UINT8> m_ram;
};
static ADDRESS_MAP_START(altair_mem, AS_PROGRAM, 8, altair_state)
ADDRESS_MAP_UNMAP_HIGH
AM_RANGE( 0x0000, 0xfcff ) AM_RAM AM_SHARE("ram")
AM_RANGE( 0xfd00, 0xfdff ) AM_ROM
AM_RANGE( 0xff00, 0xffff ) AM_ROM
ADDRESS_MAP_END
static ADDRESS_MAP_START(altair_io, AS_IO, 8, altair_state)
ADDRESS_MAP_UNMAP_HIGH
ADDRESS_MAP_GLOBAL_MASK(0xff)
// TODO: Remove AM_MIRROR() and use SIO address S0-S7
AM_RANGE( 0x00, 0x00 ) AM_MIRROR(0x10) AM_DEVREADWRITE("mc6850", acia6850_device, status_r, control_w)
AM_RANGE( 0x01, 0x01 ) AM_MIRROR(0x10) AM_DEVREADWRITE("mc6850", acia6850_device, data_r, data_w)
ADDRESS_MAP_END
/* Input ports */
static INPUT_PORTS_START( altair )
INPUT_PORTS_END
QUICKLOAD_LOAD_MEMBER( altair_state,altair)
{
int quick_length;
int read_;
quick_length = image.length();
if (quick_length >= 0xfd00)
return IMAGE_INIT_FAIL;
read_ = image.fread(m_ram, quick_length);
if (read_ != quick_length)
return IMAGE_INIT_FAIL;
return IMAGE_INIT_PASS;
}
WRITE_LINE_MEMBER(altair_state::write_acia_clock)
{
m_mc6850->write_txc(state);
m_mc6850->write_rxc(state);
}
void altair_state::machine_reset()
{
// Set startup addess done by turn-key
m_maincpu->set_state_int(I8085_PC, 0xFD00);
}
static MACHINE_CONFIG_START( altair, altair_state )
/* basic machine hardware */
MCFG_CPU_ADD("maincpu", I8080, XTAL_2MHz)
MCFG_CPU_PROGRAM_MAP(altair_mem)
MCFG_CPU_IO_MAP(altair_io)
/* video hardware */
MCFG_DEVICE_ADD("mc6850", ACIA6850, 0)
MCFG_ACIA6850_TXD_HANDLER(DEVWRITELINE("rs232", rs232_port_device, write_txd))
MCFG_ACIA6850_RTS_HANDLER(DEVWRITELINE("rs232", rs232_port_device, write_rts))
MCFG_RS232_PORT_ADD("rs232", default_rs232_devices, "serial_terminal")
MCFG_RS232_RXD_HANDLER(DEVWRITELINE("mc6850", acia6850_device, write_rxd))
MCFG_RS232_DCD_HANDLER(DEVWRITELINE("mc6850", acia6850_device, write_dcd))
MCFG_RS232_CTS_HANDLER(DEVWRITELINE("mc6850", acia6850_device, write_cts))
MCFG_DEVICE_ADD("acia_clock", CLOCK, 153600) // TODO: this is set using jumpers S3/S2/S1/S0
MCFG_CLOCK_SIGNAL_HANDLER(WRITELINE(altair_state, write_acia_clock))
/* quickload */
MCFG_QUICKLOAD_ADD("quickload", altair_state, altair, "bin", 0)
MACHINE_CONFIG_END
/* ROM definition */
ROM_START( al8800bt )
ROM_REGION( 0x10000, "maincpu", ROMREGION_ERASEFF )
ROM_LOAD( "turnmon.bin", 0xfd00, 0x0100, CRC(5c629294) SHA1(125c76216954b681721fff84a3aca05094b21a28))
ROM_LOAD( "88dskrom.bin", 0xff00, 0x0100, CRC(7c5232f3) SHA1(24f940ad70ad2829e1bc800c6790b6e993e6ebf6))
ROM_END
/* Driver */
/* YEAR NAME PARENT COMPAT MACHINE INPUT INIT COMPANY FULLNAME FLAGS */
COMP( 1975, al8800bt, 0, 0, altair, altair, driver_device, 0, "MITS", "Altair 8800bt", GAME_NOT_WORKING | GAME_NO_SOUND_HW)
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