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28cc0d1c7d
mame/src/mess/drivers/pegasus.c
Miodrag Milanovic 28cc0d1c7d various cpu lookup cleanup (nw)
2013-04-15 13:41:27 +00:00

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/***************************************************************************
Aamber Pegasus computer (New Zealand)
http://web.mac.com/lord_philip/aamber_pegasus/Aamber_Pegasus.html
Each copy of the monitor rom was made for an individual machine.
The early bios versions checked that it was running on that
particular computer.
This computer has no sound.
The usual way of loading a new rom was to plug it into the board.
We have replaced this with cartslots, to save having to recompile
whenever a new rom is found. Single rom programs will usually work in
any slot (if it is going to work at all). A working rom will appear
in the menu. Press the first letter to run it.
If a machine language program is loaded via cassette, do it in the
Monitor (L command), when loaded press Enter, and it will be in the
menu.
Basic cassettes are loaded in the usual way, that is, start Basic,
type LOAD, press Enter. When done, RUN or LIST as needed.
The Aamber Pegasus uses a MCM66710P, which is functionally
equivalent to the MCM6571.
Note that datasheet is incorrect for the number "9".
The first byte is really 0x3E rather than 0x3F, confirmed on real
hardware.
TO DO:
- Identify which rom slots the multi-rom programs should be fitted to.
- Work on the other non-working programs
****************************************************************************/
#include "emu.h"
#include "cpu/m6809/m6809.h"
#include "machine/6821pia.h"
#include "imagedev/cartslot.h"
#include "imagedev/cassette.h"
#include "sound/wave.h"
class pegasus_state : public driver_device
{
public:
pegasus_state(const machine_config &mconfig, device_type type, const char *tag)
: driver_device(mconfig, type, tag),
m_maincpu(*this, "maincpu"),
m_cass(*this, CASSETTE_TAG),
m_pia_s(*this, "pia_s"),
m_pia_u(*this, "pia_u"),
m_p_videoram(*this, "p_videoram"){ }
required_device<cpu_device> m_maincpu;
required_device<cassette_image_device> m_cass;
required_device<pia6821_device> m_pia_s;
required_device<pia6821_device> m_pia_u;
DECLARE_READ8_MEMBER( pegasus_keyboard_r );
DECLARE_READ8_MEMBER( pegasus_protection_r );
DECLARE_READ8_MEMBER( pegasus_pcg_r );
DECLARE_WRITE8_MEMBER( pegasus_controls_w );
DECLARE_WRITE8_MEMBER( pegasus_keyboard_w );
DECLARE_WRITE8_MEMBER( pegasus_pcg_w );
DECLARE_READ_LINE_MEMBER( pegasus_keyboard_irq );
DECLARE_READ_LINE_MEMBER( pegasus_cassette_r );
DECLARE_WRITE_LINE_MEMBER( pegasus_cassette_w );
DECLARE_WRITE_LINE_MEMBER( pegasus_firq_clr );
UINT8 m_kbd_row;
bool m_kbd_irq;
UINT8 *m_p_pcgram;
required_shared_ptr<const UINT8> m_p_videoram;
const UINT8 *m_p_chargen;
UINT8 m_control_bits;
virtual void machine_reset();
virtual void machine_start();
virtual void video_start();
UINT32 screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
DECLARE_DRIVER_INIT(pegasus);
TIMER_DEVICE_CALLBACK_MEMBER(pegasus_firq);
DECLARE_DEVICE_IMAGE_LOAD_MEMBER(pegasus_cart_1);
DECLARE_DEVICE_IMAGE_LOAD_MEMBER(pegasus_cart_2);
DECLARE_DEVICE_IMAGE_LOAD_MEMBER(pegasus_cart_3);
DECLARE_DEVICE_IMAGE_LOAD_MEMBER(pegasus_cart_4);
DECLARE_DEVICE_IMAGE_LOAD_MEMBER(pegasus_cart_5);
void pegasus_decrypt_rom( UINT16 addr );
};
TIMER_DEVICE_CALLBACK_MEMBER(pegasus_state::pegasus_firq)
{
m_maincpu->set_input_line(M6809_FIRQ_LINE, HOLD_LINE);
}
WRITE_LINE_MEMBER( pegasus_state::pegasus_firq_clr )
{
m_maincpu->set_input_line(M6809_FIRQ_LINE, CLEAR_LINE);
}
READ8_MEMBER( pegasus_state::pegasus_keyboard_r )
{
static const char *const keynames[] = { "X0", "X1", "X2", "X3", "X4", "X5", "X6", "X7" };
UINT8 bit,data = 0xff;
for (bit = 0; bit < 8; bit++)
if (!BIT(m_kbd_row, bit)) data &= ioport(keynames[bit])->read();
m_kbd_irq = (data == 0xff) ? 1 : 0;
if (m_control_bits & 8) data<<=4;
return data;
}
WRITE8_MEMBER( pegasus_state::pegasus_keyboard_w )
{
m_kbd_row = data;
}
WRITE8_MEMBER( pegasus_state::pegasus_controls_w )
{
/* d0,d2 - not emulated
d0 - Blank - Video blanking
d1 - Char - select character rom or ram
d2 - Page - enables writing to video ram
d3 - Asc - Select which half of the keyboard to read
*/
m_control_bits = data;
}
READ_LINE_MEMBER( pegasus_state::pegasus_keyboard_irq )
{
return m_kbd_irq;
}
READ_LINE_MEMBER( pegasus_state::pegasus_cassette_r )
{
return m_cass->input();
}
WRITE_LINE_MEMBER( pegasus_state::pegasus_cassette_w )
{
m_cass->output(state ? 1 : -1);
}
READ8_MEMBER( pegasus_state::pegasus_pcg_r )
{
UINT8 code = m_p_videoram[offset] & 0x7f;
return m_p_pcgram[(code << 4) | (~m_kbd_row & 15)];
}
WRITE8_MEMBER( pegasus_state::pegasus_pcg_w )
{
// if (m_control_bits & 2)
{
UINT8 code = m_p_videoram[offset] & 0x7f;
m_p_pcgram[(code << 4) | (~m_kbd_row & 15)] = data;
}
}
/* Must return the A register except when it is doing a rom search */
READ8_MEMBER( pegasus_state::pegasus_protection_r )
{
UINT8 data = m_maincpu->state_int(M6809_A);
if (data == 0x20) data = 0xff;
return data;
}
static ADDRESS_MAP_START(pegasus_mem, AS_PROGRAM, 8, pegasus_state)
ADDRESS_MAP_UNMAP_HIGH
AM_RANGE(0x0000, 0x2fff) AM_ROM
AM_RANGE(0xb000, 0xbdff) AM_RAM
AM_RANGE(0xbe00, 0xbfff) AM_RAM AM_SHARE("p_videoram")
AM_RANGE(0xc000, 0xdfff) AM_ROM AM_WRITENOP
AM_RANGE(0xe000, 0xe1ff) AM_READ(pegasus_protection_r)
AM_RANGE(0xe200, 0xe3ff) AM_READWRITE(pegasus_pcg_r,pegasus_pcg_w)
AM_RANGE(0xe400, 0xe403) AM_MIRROR(0x1fc) AM_DEVREADWRITE("pia_u", pia6821_device, read, write)
AM_RANGE(0xe600, 0xe603) AM_MIRROR(0x1fc) AM_DEVREADWRITE("pia_s", pia6821_device, read, write)
AM_RANGE(0xf000, 0xffff) AM_ROM
ADDRESS_MAP_END
static ADDRESS_MAP_START(pegasusm_mem, AS_PROGRAM, 8, pegasus_state)
ADDRESS_MAP_UNMAP_HIGH
AM_RANGE(0x0000, 0x2fff) AM_ROM
AM_RANGE(0x5000, 0xbdff) AM_RAM
AM_RANGE(0xbe00, 0xbfff) AM_RAM AM_SHARE("p_videoram")
AM_RANGE(0xc000, 0xdfff) AM_ROM AM_WRITENOP
AM_RANGE(0xe000, 0xe1ff) AM_READ(pegasus_protection_r)
AM_RANGE(0xe200, 0xe3ff) AM_READWRITE(pegasus_pcg_r,pegasus_pcg_w)
AM_RANGE(0xe400, 0xe403) AM_MIRROR(0x1fc) AM_DEVREADWRITE("pia_u", pia6821_device, read, write)
AM_RANGE(0xe600, 0xe603) AM_MIRROR(0x1fc) AM_DEVREADWRITE("pia_s", pia6821_device, read, write)
AM_RANGE(0xf000, 0xffff) AM_ROM
ADDRESS_MAP_END
/* Input ports */
static INPUT_PORTS_START( pegasus )
PORT_START("X0")
PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("= +") PORT_CODE(KEYCODE_EQUALS) PORT_CHAR('=') PORT_CHAR('+')
PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("0 )") PORT_CODE(KEYCODE_0) PORT_CHAR('0') PORT_CHAR(')')
PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("BackSpace") PORT_CODE(KEYCODE_BACKSPACE) PORT_CHAR(8) PORT_CHAR(8)
PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("Break") PORT_CODE(KEYCODE_NUMLOCK) PORT_CHAR(20)
PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("\\ |") PORT_CODE(KEYCODE_BACKSLASH) PORT_CHAR('\\') PORT_CHAR('|')
PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("; :") PORT_CODE(KEYCODE_COLON) PORT_CHAR(';') PORT_CHAR(':')
PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("L") PORT_CODE(KEYCODE_L) PORT_CHAR('L') PORT_CHAR('l') PORT_CHAR(13)
PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("P") PORT_CODE(KEYCODE_P) PORT_CHAR('P') PORT_CHAR('p') PORT_CHAR(16)
PORT_START("X1")
PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("- _") PORT_CODE(KEYCODE_MINUS) PORT_CHAR('-') PORT_CHAR('_')
PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("Tab") PORT_CODE(KEYCODE_9) PORT_CHAR('9') PORT_CHAR('(')
PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("[ ]") PORT_CODE(KEYCODE_OPENBRACE) PORT_CHAR('[') PORT_CHAR(']')
PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("Delete") PORT_CODE(KEYCODE_DEL) PORT_CHAR(127) PORT_CHAR('_')
PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("\' \"") PORT_CODE(KEYCODE_QUOTE) PORT_CHAR('\'') PORT_CHAR('"')
PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("I") PORT_CODE(KEYCODE_I) PORT_CHAR('I') PORT_CHAR('i') PORT_CHAR(9)
PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("K") PORT_CODE(KEYCODE_K) PORT_CHAR('K') PORT_CHAR('k') PORT_CHAR(11)
PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("O") PORT_CODE(KEYCODE_O) PORT_CHAR('O') PORT_CHAR('o') PORT_CHAR(15)
PORT_START("X2")
PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("5 %") PORT_CODE(KEYCODE_5) PORT_CHAR('5') PORT_CHAR('%')
PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("8 *") PORT_CODE(KEYCODE_8) PORT_CHAR('8') PORT_CHAR('*')
PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("6 ^") PORT_CODE(KEYCODE_6) PORT_CHAR('6') PORT_CHAR('^')
PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("` ~") PORT_CODE(KEYCODE_TILDE) PORT_CHAR('`') PORT_CHAR('~')
PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("/ ?") PORT_CODE(KEYCODE_SLASH) PORT_CHAR('/') PORT_CHAR('?')
PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("J") PORT_CODE(KEYCODE_J) PORT_CHAR('J') PORT_CHAR('j') PORT_CHAR(10)
PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("U") PORT_CODE(KEYCODE_U) PORT_CHAR('U') PORT_CHAR('u') PORT_CHAR(21)
PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("G") PORT_CODE(KEYCODE_G) PORT_CHAR('G') PORT_CHAR('g') PORT_CHAR(7)
PORT_START("X3")
PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("T") PORT_CODE(KEYCODE_T) PORT_CHAR('T') PORT_CHAR('t') PORT_CHAR(20)
PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("7 &") PORT_CODE(KEYCODE_7) PORT_CHAR('7') PORT_CHAR('&')
PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("4 $") PORT_CODE(KEYCODE_4) PORT_CHAR('4') PORT_CHAR('$')
PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_UNUSED ) // outputs a space
PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("ShiftR") PORT_NAME("ShiftR") PORT_CODE(KEYCODE_RSHIFT) PORT_CHAR(UCHAR_SHIFT_1)
PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME(". >") PORT_CODE(KEYCODE_STOP) PORT_CHAR('.') PORT_CHAR('>')
PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("H") PORT_CODE(KEYCODE_H) PORT_CHAR('H') PORT_CHAR('h') PORT_CHAR(8)
PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("Y") PORT_CODE(KEYCODE_Y) PORT_CHAR('Y') PORT_CHAR('y') PORT_CHAR(25)
PORT_START("X4")
PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("R") PORT_CODE(KEYCODE_R) PORT_CHAR('R') PORT_CHAR('r') PORT_CHAR(18)
PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("W") PORT_CODE(KEYCODE_W) PORT_CHAR('W') PORT_CHAR('w') PORT_CHAR(23)
PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("2") PORT_CODE(KEYCODE_2) PORT_CHAR('2') PORT_CHAR('@')
PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("3") PORT_CODE(KEYCODE_3) PORT_CHAR('3') PORT_CHAR('#')
PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_UNUSED ) // outputs a space
PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME(", <") PORT_CODE(KEYCODE_COMMA) PORT_CHAR(',') PORT_CHAR('<')
PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("C") PORT_CODE(KEYCODE_C) PORT_CHAR('C') PORT_CHAR('c') PORT_CHAR(3)
PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("F") PORT_CODE(KEYCODE_F) PORT_CHAR('F') PORT_CHAR('f') PORT_CHAR(6)
PORT_START("X5")
PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("E") PORT_CODE(KEYCODE_E) PORT_CHAR('E') PORT_CHAR('e') PORT_CHAR(5)
PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("Q") PORT_CODE(KEYCODE_Q) PORT_CHAR('Q') PORT_CHAR('q') PORT_CHAR(17)
PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_UNUSED ) // REPEAT key which is disconnected - outputs a space
PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("1 !") PORT_CODE(KEYCODE_1) PORT_CHAR('1') PORT_CHAR('!')
PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("LineFeed") PORT_CODE(KEYCODE_ENTER_PAD) PORT_CHAR(10)
PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("M") PORT_CODE(KEYCODE_M) PORT_CHAR('M') PORT_CHAR('m') PORT_CHAR(13)
PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("D") PORT_CODE(KEYCODE_D) PORT_CHAR('D') PORT_CHAR('d') PORT_CHAR(4)
PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("N") PORT_CODE(KEYCODE_N) PORT_CHAR('N') PORT_CHAR('n') PORT_CHAR(14)
PORT_START("X6")
PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("V") PORT_CODE(KEYCODE_V) PORT_CHAR('V') PORT_CHAR('v') PORT_CHAR(22)
PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("A") PORT_CODE(KEYCODE_A) PORT_CHAR('A') PORT_CHAR('a') PORT_CHAR(1)
PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("Tab") PORT_CODE(KEYCODE_TAB) PORT_CHAR(9)
PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("Esc") PORT_CODE(KEYCODE_ESC) PORT_CHAR(27)
PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("Space") PORT_CODE(KEYCODE_SPACE) PORT_CHAR(' ')
PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("Return") PORT_CODE(KEYCODE_ENTER) PORT_CHAR(13)
PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("X") PORT_CODE(KEYCODE_X) PORT_CHAR('X') PORT_CHAR('x') PORT_CHAR(24)
PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("BlankL") PORT_CODE(KEYCODE_0_PAD) PORT_CHAR(16)
PORT_START("X7")
PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("B") PORT_CODE(KEYCODE_B) PORT_CHAR('B') PORT_CHAR('b') PORT_CHAR(2)
PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("S") PORT_CODE(KEYCODE_S) PORT_CHAR('S') PORT_CHAR('s') PORT_CHAR(19)
PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("CapsLock") PORT_CODE(KEYCODE_CAPSLOCK) PORT_CHAR(19)
PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("CTRL") PORT_CODE(KEYCODE_LCONTROL) PORT_CODE(KEYCODE_RCONTROL) PORT_CHAR(UCHAR_SHIFT_2)
PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("ShiftL") PORT_CODE(KEYCODE_LSHIFT) PORT_CHAR(UCHAR_SHIFT_1)
PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("BlankR") PORT_CODE(KEYCODE_DEL_PAD) PORT_CHAR(21)
PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("Z") PORT_CODE(KEYCODE_Z) PORT_CHAR('Z') PORT_CHAR('z') PORT_CHAR(26)
PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("{ }") PORT_CODE(KEYCODE_CLOSEBRACE) PORT_CHAR('{') PORT_CHAR('}')
INPUT_PORTS_END
/* System - for keyboard, video, general housekeeping */
static const pia6821_interface pegasus_pia_s_intf=
{
DEVCB_NULL, /* port A input */
DEVCB_DRIVER_MEMBER(pegasus_state, pegasus_keyboard_r), /* port B input */
DEVCB_DRIVER_LINE_MEMBER(pegasus_state, pegasus_cassette_r), /* CA1 input */
DEVCB_DRIVER_LINE_MEMBER(pegasus_state, pegasus_keyboard_irq), /* CB1 input */
DEVCB_NULL, /* CA2 input */
DEVCB_NULL, /* CB2 input */
DEVCB_DRIVER_MEMBER(pegasus_state, pegasus_keyboard_w), /* port A output */
DEVCB_DRIVER_MEMBER(pegasus_state, pegasus_controls_w), /* port B output */
DEVCB_DRIVER_LINE_MEMBER(pegasus_state, pegasus_cassette_w), /* CA2 output */
DEVCB_DRIVER_LINE_MEMBER(pegasus_state, pegasus_firq_clr), /* CB2 output */
DEVCB_CPU_INPUT_LINE("maincpu", M6809_IRQ_LINE), /* IRQA output */
DEVCB_CPU_INPUT_LINE("maincpu", M6809_IRQ_LINE) /* IRQB output */
};
/* User interface - for connection of external equipment */
static const pia6821_interface pegasus_pia_u_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", M6809_IRQ_LINE),
DEVCB_CPU_INPUT_LINE("maincpu", M6809_IRQ_LINE)
};
static const cassette_interface pegasus_cassette_interface =
{
cassette_default_formats,
NULL,
(cassette_state)(CASSETTE_STOPPED|CASSETTE_MOTOR_ENABLED),
NULL,
NULL
};
void pegasus_state::video_start()
{
m_p_chargen = memregion("chargen")->base();
}
static const UINT8 mcm6571a_shift[] =
{
0,1,1,0,0,0,1,0,0,0,0,1,0,0,0,0,
1,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,1,0,0,1,0,0,0,0,0,
1,1,0,0,0,0,0,0,0,1,0,0,0,0,0,0
};
UINT32 pegasus_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
UINT8 y,ra,chr,gfx,inv;
UINT16 sy=0,ma=0,x;
UINT8 pcg_mode = m_control_bits & 2;
for(y = 0; y < 16; y++ )
{
for(ra = 0; ra < 16; ra++ )
{
UINT16 *p = &bitmap.pix16(sy++);
for(x = ma; x < ma + 32; x++ )
{
inv = 0xff;
chr = m_p_videoram[x];
if (BIT(chr, 7))
{
inv = 0;
chr &= 0x7f;
}
if (pcg_mode)
{
gfx = m_p_pcgram[(chr << 4) | ra] ^ inv;
}
else
if (mcm6571a_shift[chr])
{
if (ra < 3)
gfx = inv;
else
gfx = m_p_chargen[(chr<<4) | (ra-3) ] ^ inv;
}
else
{
if (ra < 10)
gfx = m_p_chargen[(chr<<4) | ra ] ^ inv;
else
gfx = inv;
}
/* Display a scanline of a character */
*p++ = BIT(gfx, 7);
*p++ = BIT(gfx, 6);
*p++ = BIT(gfx, 5);
*p++ = BIT(gfx, 4);
*p++ = BIT(gfx, 3);
*p++ = BIT(gfx, 2);
*p++ = BIT(gfx, 1);
*p++ = BIT(gfx, 0);
}
}
ma+=32;
}
return 0;
}
/* F4 Character Displayer */
static const gfx_layout pegasus_charlayout =
{
8, 16, /* text = 7 x 9, pcg = 8 x 16 */
128, /* 128 characters */
1, /* 1 bits per pixel */
{ 0 }, /* no bitplanes */
/* x offsets */
{ 0, 1, 2, 3, 4, 5, 6, 7 },
/* y offsets */
{ 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8, 8*8, 9*8, 10*8, 11*8, 12*8, 13*8, 14*8, 15*8 },
8*16 /* every char takes 16 bytes */
};
static GFXDECODE_START( pegasus )
GFXDECODE_ENTRY( "chargen", 0x0000, pegasus_charlayout, 0, 1 )
GFXDECODE_ENTRY( "pcg", 0x0000, pegasus_charlayout, 0, 1 )
GFXDECODE_END
/* An encrypted single rom starts with 02, decrypted with 20. Not sure what
multipart roms will have. */
void pegasus_state::pegasus_decrypt_rom( UINT16 addr )
{
UINT8 b, *ROM = memregion("maincpu")->base();
UINT16 i, j;
UINT8 buff[0x1000];
if (ROM[addr] == 0x02)
{
for (i = 0; i < 0x1000; i++)
{
b = ROM[addr|i];
j = BITSWAP16( i, 15, 14, 13, 12, 11, 10, 9, 8, 0, 1, 2, 3, 4, 5, 6, 7 );
b = BITSWAP8( b, 3, 2, 1, 0, 7, 6, 5, 4 );
buff[j&0xfff] = b;
}
for (i = 0; i < 0x1000; i++)
ROM[addr|i] = buff[i];
}
}
DEVICE_IMAGE_LOAD_MEMBER( pegasus_state, pegasus_cart_1 )
{
image.fread(memregion("maincpu")->base() + 0x0000, 0x1000);
pegasus_decrypt_rom( 0x0000 );
return IMAGE_INIT_PASS;
}
DEVICE_IMAGE_LOAD_MEMBER( pegasus_state, pegasus_cart_2 )
{
image.fread(memregion("maincpu")->base() + 0x1000, 0x1000);
pegasus_decrypt_rom( 0x1000 );
return IMAGE_INIT_PASS;
}
DEVICE_IMAGE_LOAD_MEMBER( pegasus_state, pegasus_cart_3 )
{
image.fread(memregion("maincpu")->base() + 0x2000, 0x1000);
pegasus_decrypt_rom( 0x2000 );
return IMAGE_INIT_PASS;
}
DEVICE_IMAGE_LOAD_MEMBER( pegasus_state, pegasus_cart_4 )
{
image.fread(memregion("maincpu")->base() + 0xc000, 0x1000);
pegasus_decrypt_rom( 0xc000 );
return IMAGE_INIT_PASS;
}
DEVICE_IMAGE_LOAD_MEMBER( pegasus_state, pegasus_cart_5 )
{
image.fread(memregion("maincpu")->base() + 0xd000, 0x1000);
pegasus_decrypt_rom( 0xd000 );
return IMAGE_INIT_PASS;
}
void pegasus_state::machine_start()
{
m_p_pcgram = memregion("pcg")->base();
}
void pegasus_state::machine_reset()
{
m_kbd_row = 0;
m_kbd_irq = 1;
m_control_bits = 0;
}
DRIVER_INIT_MEMBER(pegasus_state,pegasus)
{
pegasus_decrypt_rom( 0xf000 );
}
static MACHINE_CONFIG_START( pegasus, pegasus_state )
/* basic machine hardware */
MCFG_CPU_ADD("maincpu", M6809E, XTAL_4MHz) // actually a 6809C - 4MHZ clock coming in, 1MHZ internally
MCFG_CPU_PROGRAM_MAP(pegasus_mem)
MCFG_TIMER_DRIVER_ADD_PERIODIC("pegasus_firq", pegasus_state, pegasus_firq, attotime::from_hz(400))
/* video hardware */
MCFG_SCREEN_ADD("screen", RASTER)
MCFG_SCREEN_REFRESH_RATE(50)
MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500)) /* not accurate */
MCFG_SCREEN_UPDATE_DRIVER(pegasus_state, screen_update)
MCFG_SCREEN_SIZE(32*8, 16*16)
MCFG_SCREEN_VISIBLE_AREA(0, 32*8-1, 0, 16*16-1)
MCFG_GFXDECODE(pegasus)
MCFG_PALETTE_LENGTH(2)
MCFG_PALETTE_INIT(black_and_white)
/* sound hardware */
MCFG_SPEAKER_STANDARD_MONO("mono")
MCFG_SOUND_WAVE_ADD(WAVE_TAG, CASSETTE_TAG)
MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.25)
/* devices */
MCFG_PIA6821_ADD( "pia_s", pegasus_pia_s_intf )
MCFG_PIA6821_ADD( "pia_u", pegasus_pia_u_intf )
MCFG_CARTSLOT_ADD("cart1")
MCFG_CARTSLOT_EXTENSION_LIST("bin")
MCFG_CARTSLOT_LOAD(pegasus_state,pegasus_cart_1)
MCFG_CARTSLOT_ADD("cart2")
MCFG_CARTSLOT_EXTENSION_LIST("bin")
MCFG_CARTSLOT_LOAD(pegasus_state,pegasus_cart_2)
MCFG_CARTSLOT_ADD("cart3")
MCFG_CARTSLOT_EXTENSION_LIST("bin")
MCFG_CARTSLOT_LOAD(pegasus_state,pegasus_cart_3)
MCFG_CARTSLOT_ADD("cart4")
MCFG_CARTSLOT_EXTENSION_LIST("bin")
MCFG_CARTSLOT_LOAD(pegasus_state,pegasus_cart_4)
MCFG_CARTSLOT_ADD("cart5")
MCFG_CARTSLOT_EXTENSION_LIST("bin")
MCFG_CARTSLOT_LOAD(pegasus_state,pegasus_cart_5)
MCFG_CASSETTE_ADD( CASSETTE_TAG, pegasus_cassette_interface )
MACHINE_CONFIG_END
static MACHINE_CONFIG_DERIVED( pegasusm, pegasus )
MCFG_CPU_MODIFY( "maincpu" )
MCFG_CPU_PROGRAM_MAP(pegasusm_mem)
MACHINE_CONFIG_END
/* ROM definition */
ROM_START( pegasus )
ROM_REGION( 0x10000, "maincpu", ROMREGION_ERASEFF )
ROM_SYSTEM_BIOS(0, "11r2674", "Monitor 1.1 r2674")
ROMX_LOAD( "mon11_2674.bin", 0xf000, 0x1000, CRC(1640ff7e) SHA1(8199643749fb40fb8be05e9f311c75620ca939b1), ROM_BIOS(1) )
ROM_SYSTEM_BIOS(1, "10r2569", "Monitor 1.0 r2569")
ROMX_LOAD( "mon10_2569.bin", 0xf000, 0x1000, CRC(910fc930) SHA1(a4f6bbe5def0268cc49ee7045616a39017dd8052), ROM_BIOS(2) )
ROM_SYSTEM_BIOS(2, "11r2569", "Monitor 1.1 r2569")
ROMX_LOAD( "mon11_2569.bin", 0xf000, 0x1000, CRC(07b92002) SHA1(3c434601120870c888944ecd9ade5186432ddbc2), ROM_BIOS(3) )
ROM_SYSTEM_BIOS(3, "11r2669", "Monitor 1.1 r2669")
ROMX_LOAD( "mon11_2669.bin", 0xf000, 0x1000, CRC(f3ee23c8) SHA1(3ac96935668f5e53799c90db5140393c2ef9ce36), ROM_BIOS(4) )
ROM_SYSTEM_BIOS(4, "22r2856", "Monitor 2.2 r2856")
ROMX_LOAD( "mon22_2856.bin", 0xf000, 0x1000, CRC(5f5f688a) SHA1(3719eecc347e158dd027ea7aa8a068cdafc00d9b), ROM_BIOS(5) )
ROM_SYSTEM_BIOS(5, "22br2856", "Monitor 2.2B r2856")
ROMX_LOAD( "mon22b_2856.bin", 0xf000, 0x1000, CRC(a47b0308) SHA1(f215e51aa8df6aed99c10f3df6a3589cb9f63d46), ROM_BIOS(6) )
ROM_SYSTEM_BIOS(6, "23r2601", "Monitor 2.3 r2601")
ROMX_LOAD( "mon23_2601.bin", 0xf000, 0x1000, CRC(0e024222) SHA1(9950cba08996931b9d5a3368b44c7309638b4e08), ROM_BIOS(7) )
ROM_SYSTEM_BIOS(7, "23ar2569", "Monitor 2.3A r2569")
ROMX_LOAD( "mon23a_2569.bin", 0xf000, 0x1000, CRC(248e62c9) SHA1(adbde27e69b38b29ff89bacf28d0240a8e5d90f3), ROM_BIOS(8) )
ROM_REGION( 0x800, "chargen", 0 )
ROM_LOAD( "6571.bin", 0x0000, 0x0800, CRC(5a25144b) SHA1(7b9fee0c8ef2605b85d12b6d9fe8feb82418c63a) )
ROM_REGION( 0x800, "pcg", ROMREGION_ERASEFF )
ROM_END
#define rom_pegasusm rom_pegasus
/* Driver */
/* YEAR NAME PARENT COMPAT MACHINE INPUT INIT COMPANY FULLNAME FLAGS */
COMP( 1981, pegasus, 0, 0, pegasus, pegasus, pegasus_state, pegasus, "Technosys", "Aamber Pegasus", GAME_NO_SOUND_HW )
COMP( 1981, pegasusm, pegasus, 0, pegasusm, pegasus, pegasus_state, pegasus, "Technosys", "Aamber Pegasus with RAM expansion unit", GAME_NO_SOUND_HW )
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