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/******************************************************************************
Motorola Evaluation Kit 6800 D2
MEK6800D2
system driver
Juergen Buchmueller <pullmoll@t-online.de>, Jan 2000
memory map
range short description
0000-00ff RAM 256 bytes RAM
0100-01ff RAM optional 256 bytes RAM
6000-63ff PROM optional PROM
or
6000-67ff ROM optional ROM
8004-8007 PIA expansion port
8008-8009 ACIA cassette interface
8020-8023 PIA keyboard interface
a000-a07f RAM 128 bytes RAM (JBUG scratch)
c000-c3ff PROM optional PROM
or
c000-c7ff ROM optional ROM
e000-e3ff ROM JBUG monitor program
e400-ffff -/- mirrors of monitor rom
TODO
- Cassette (it is extremely complex, with approx 10 chips)
- Proper artwork
******************************************************************************/
#include "emu.h"
#include "cpu/m6800/m6800.h"
#include "machine/6821pia.h"
#include "machine/6850acia.h"
#include "imagedev/cassette.h"
#include "sound/wave.h"
#include "imagedev/cartslot.h"
#include "mekd2.lh"
#define XTAL_MEKD2 1228800
class mekd2_state : public driver_device
{
public:
mekd2_state(const machine_config &mconfig, device_type type, const char *tag)
: driver_device(mconfig, type, tag),
m_maincpu(*this, "maincpu"),
m_pia_s(*this, "pia_s"),
m_pia_u(*this, "pia_u"),
m_acia(*this, "acia")
{ }
required_device<cpu_device> m_maincpu;
required_device<pia6821_device> m_pia_s;
required_device<pia6821_device> m_pia_u;
required_device<acia6850_device> m_acia;
DECLARE_READ_LINE_MEMBER( mekd2_key40_r );
DECLARE_READ8_MEMBER( mekd2_key_r );
DECLARE_WRITE_LINE_MEMBER( mekd2_nmi_w );
DECLARE_WRITE8_MEMBER( mekd2_digit_w );
DECLARE_WRITE8_MEMBER( mekd2_segment_w );
UINT8 m_segment;
UINT8 m_digit;
UINT8 m_keydata;
TIMER_CALLBACK_MEMBER(mekd2_trace);
};
/***********************************************************
Address Map
************************************************************/
static ADDRESS_MAP_START( mekd2_mem , AS_PROGRAM, 8, mekd2_state)
AM_RANGE(0x0000, 0x00ff) AM_RAM // user ram
AM_RANGE(0x8004, 0x8007) AM_DEVREADWRITE("pia_u", pia6821_device, read, write)
AM_RANGE(0x8008, 0x8008) AM_DEVREADWRITE("acia", acia6850_device, status_read, control_write)
AM_RANGE(0x8009, 0x8009) AM_DEVREADWRITE("acia", acia6850_device, data_read, data_write)
AM_RANGE(0x8020, 0x8023) AM_DEVREADWRITE("pia_s", pia6821_device, read, write)
AM_RANGE(0xa000, 0xa07f) AM_RAM // system ram
AM_RANGE(0xe000, 0xe3ff) AM_ROM AM_MIRROR(0x1c00) /* JBUG ROM */
ADDRESS_MAP_END
/***********************************************************
Keys
************************************************************/
/*
Enter the 4 digit address then the command key:
- M : Examine and Change Memory (example: E000M, then G to skip to next, H to exit)
- E : Escape (abort) operation (H key in our emulation)
- R : Examine Registers
- G : Begin execution at specified address
- P : Punch data from memory to magnetic tape
- L : Load memory from magnetic tape
- N : Trace one instruction
- V : Set (and remove) breakpoints
The keys are laid out as:
P L N V
7 8 9 A M
4 5 6 B E
1 2 3 C R
0 F E D G
*/
static INPUT_PORTS_START( mekd2 )
PORT_START("X0")
PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("0") PORT_CODE(KEYCODE_0)
PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("F") PORT_CODE(KEYCODE_F)
PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("E (hex)") PORT_CODE(KEYCODE_E)
PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("D") PORT_CODE(KEYCODE_D)
PORT_START("X1")
PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("1") PORT_CODE(KEYCODE_1)
PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("2") PORT_CODE(KEYCODE_2)
PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("3") PORT_CODE(KEYCODE_3)
PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("C") PORT_CODE(KEYCODE_C)
PORT_START("X2")
PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("4") PORT_CODE(KEYCODE_4)
PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("5") PORT_CODE(KEYCODE_5)
PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("6") PORT_CODE(KEYCODE_6)
PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("B") PORT_CODE(KEYCODE_B)
PORT_START("X3")
PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("7") PORT_CODE(KEYCODE_7)
PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("8") PORT_CODE(KEYCODE_8)
PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("9") PORT_CODE(KEYCODE_9)
PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("A") PORT_CODE(KEYCODE_A)
PORT_START("X4")
PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("P") PORT_CODE(KEYCODE_P)
PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("L") PORT_CODE(KEYCODE_L)
PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("N") PORT_CODE(KEYCODE_N)
PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("V") PORT_CODE(KEYCODE_V)
PORT_START("X5")
PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("M") PORT_CODE(KEYCODE_M)
PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("E (escape)") PORT_CODE(KEYCODE_H)
PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("R") PORT_CODE(KEYCODE_R)
PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("G") PORT_CODE(KEYCODE_G)
INPUT_PORTS_END
/***********************************************************
Trace hardware (what happens when N is pressed)
************************************************************/
TIMER_CALLBACK_MEMBER(mekd2_state::mekd2_trace)
{
machine().device("maincpu")->execute().set_input_line(INPUT_LINE_NMI, ASSERT_LINE);
}
WRITE_LINE_MEMBER( mekd2_state::mekd2_nmi_w )
{
if (state)
machine().device("maincpu")->execute().set_input_line(INPUT_LINE_NMI, CLEAR_LINE);
else
machine().scheduler().timer_set(attotime::from_usec(18), timer_expired_delegate(FUNC(mekd2_state::mekd2_trace),this));
}
/***********************************************************
Keyboard
************************************************************/
READ_LINE_MEMBER( mekd2_state::mekd2_key40_r )
{
return BIT(m_keydata, 6);
}
READ8_MEMBER( mekd2_state::mekd2_key_r )
{
char kbdrow[4];
UINT8 i;
m_keydata = 0xff;
for (i = 0; i < 6; i++)
{
if (BIT(m_digit, i))
{
sprintf(kbdrow,"X%d",i);
m_keydata &= ioport(kbdrow)->read();
}
}
i = 0x80;
if (m_digit < 0x40)
i = BIT(m_keydata, 0) ? 0x80 : 0;
else
if (m_digit < 0x80)
i = BIT(m_keydata, 1) ? 0x80 : 0;
else
if (m_digit < 0xc0)
i = BIT(m_keydata, 2) ? 0x80 : 0;
else
i = BIT(m_keydata, 3) ? 0x80 : 0;
return i | m_segment;
}
/***********************************************************
LED display
************************************************************/
WRITE8_MEMBER( mekd2_state::mekd2_segment_w )
{
m_segment = data & 0x7f;
}
WRITE8_MEMBER( mekd2_state::mekd2_digit_w )
{
UINT8 i;
if (data < 0x3f)
{
for (i = 0; i < 6; i++)
{
if (BIT(data, i))
output_set_digit_value(i, ~m_segment & 0x7f);
}
}
m_digit = data;
}
/***********************************************************
Interfaces
************************************************************/
static const pia6821_interface mekd2_s_mc6821_intf =
{
DEVCB_DRIVER_MEMBER(mekd2_state, mekd2_key_r), /* port A input */
DEVCB_NULL, /* port B input */
DEVCB_NULL, /* CA1 input */
DEVCB_DRIVER_LINE_MEMBER(mekd2_state, mekd2_key40_r), /* CB1 input */
DEVCB_NULL, /* CA2 input */
DEVCB_NULL, /* CB2 input */
DEVCB_DRIVER_MEMBER(mekd2_state, mekd2_segment_w), /* port A output */
DEVCB_DRIVER_MEMBER(mekd2_state, mekd2_digit_w), /* port B output */
DEVCB_DRIVER_LINE_MEMBER(mekd2_state, mekd2_nmi_w), /* CA2 output */
DEVCB_NULL, /* CB2 output */
DEVCB_CPU_INPUT_LINE("maincpu", INPUT_LINE_NMI), /* IRQA output */
DEVCB_CPU_INPUT_LINE("maincpu", INPUT_LINE_NMI) /* IRQB output */
};
static const pia6821_interface mekd2_u_mc6821_intf =
{
DEVCB_NULL, /* port A input */
DEVCB_NULL, /* port B input */
DEVCB_NULL, /* CA1 input */
DEVCB_NULL, /* CB1 input */
DEVCB_NULL, /* CA2 input */
DEVCB_NULL, /* CB2 input */
DEVCB_NULL, /* port A output */
DEVCB_NULL, /* port B output */
DEVCB_NULL, /* CA2 output */
DEVCB_NULL, /* CB2 output */
DEVCB_CPU_INPUT_LINE("maincpu", M6800_IRQ_LINE), /* IRQA output */
DEVCB_CPU_INPUT_LINE("maincpu", M6800_IRQ_LINE) /* IRQB output */
};
static ACIA6850_INTERFACE( mekd2_acia_intf )
{
XTAL_MEKD2 / 256, //connected to cassette circuit /* tx clock 4800Hz */
XTAL_MEKD2 / 256, //connected to cassette circuit /* rx clock varies, controlled by cassette circuit */
DEVCB_NULL,//LINE(cass),//connected to cassette circuit /* in rxd func */
DEVCB_NULL,//LINE(cass),//connected to cassette circuit /* out txd func */
DEVCB_NULL, /* in cts func */
DEVCB_NULL, //connected to cassette circuit /* out rts func */
DEVCB_NULL, /* in dcd func */
DEVCB_NULL /* out irq func */
};
static DEVICE_IMAGE_LOAD( mekd2_cart )
{
static const char magic[] = "MEK6800D2";
char buff[9];
UINT16 addr, size;
UINT8 ident, *RAM = image.device().machine().root_device().memregion("maincpu")->base();
image.fread( buff, sizeof (buff));
if (memcmp(buff, magic, sizeof (buff)))
{
logerror( "mekd2_rom_load: magic '%s' not found\n", magic);
return IMAGE_INIT_FAIL;
}
image.fread( &addr, 2);
addr = LITTLE_ENDIANIZE_INT16(addr);
image.fread( &size, 2);
size = LITTLE_ENDIANIZE_INT16(size);
image.fread( &ident, 1);
logerror("mekd2_rom_load: $%04X $%04X $%02X\n", addr, size, ident);
while (size-- > 0)
image.fread( &RAM[addr++], 1);
return IMAGE_INIT_PASS;
}
/***********************************************************
Machine
************************************************************/
static MACHINE_CONFIG_START( mekd2, mekd2_state )
/* basic machine hardware */
MCFG_CPU_ADD("maincpu", M6800, XTAL_MEKD2 / 2) /* 614.4 kHz */
MCFG_CPU_PROGRAM_MAP(mekd2_mem)
MCFG_DEFAULT_LAYOUT(layout_mekd2)
/* sound hardware */
MCFG_SPEAKER_STANDARD_MONO("mono")
MCFG_SOUND_WAVE_ADD(WAVE_TAG, CASSETTE_TAG)
MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.25)
MCFG_CASSETTE_ADD( CASSETTE_TAG, default_cassette_interface )
/* Cartslot ?? does not come with one.. */
MCFG_CARTSLOT_ADD("cart")
MCFG_CARTSLOT_EXTENSION_LIST("d2")
MCFG_CARTSLOT_NOT_MANDATORY
MCFG_CARTSLOT_LOAD(mekd2_cart)
/* Devices */
MCFG_PIA6821_ADD("pia_s", mekd2_s_mc6821_intf)
MCFG_PIA6821_ADD("pia_u", mekd2_u_mc6821_intf)
MCFG_ACIA6850_ADD("acia", mekd2_acia_intf)
MACHINE_CONFIG_END
/***********************************************************
ROMS
************************************************************/
ROM_START(mekd2)
ROM_REGION(0x10000,"maincpu",0)
ROM_LOAD("jbug.rom", 0xe000, 0x0400, CRC(5ed08792) SHA1(b06e74652a4c4e67c4a12ddc191ffb8c07f3332e) )
ROM_END
/***************************************************************************
Game driver(s)
***************************************************************************/
/* YEAR NAME PARENT COMPAT MACHINE INPUT INIT COMPANY FULLNAME */
CONS( 1977, mekd2, 0, 0, mekd2, mekd2, driver_device, 0, "Motorola", "MEK6800D2" , GAME_NOT_WORKING )
|