summaryrefslogtreecommitdiffstatshomepage
path: root/src/mess/drivers/pegasus.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/mess/drivers/pegasus.c')
-rw-r--r--src/mess/drivers/pegasus.c578
1 files changed, 578 insertions, 0 deletions
diff --git a/src/mess/drivers/pegasus.c b/src/mess/drivers/pegasus.c
new file mode 100644
index 00000000000..eda2ad87dc6
--- /dev/null
+++ b/src/mess/drivers/pegasus.c
@@ -0,0 +1,578 @@
+/***************************************************************************
+
+ 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"
+
+
+#define MACHINE_RESET_MEMBER(name) void name::machine_reset()
+#define MACHINE_START_MEMBER(name) void name::machine_start()
+#define VIDEO_START_MEMBER(name) void name::video_start()
+#define SCREEN_UPDATE16_MEMBER(name) UINT32 name::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
+
+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<device_t> m_pia_s;
+ required_device<device_t> 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);
+};
+
+static TIMER_DEVICE_CALLBACK( pegasus_firq )
+{
+ device_t *cpu = timer.machine().device( "maincpu" );
+ device_set_input_line(cpu, M6809_FIRQ_LINE, HOLD_LINE);
+}
+
+WRITE_LINE_MEMBER( pegasus_state::pegasus_firq_clr )
+{
+ cputag_set_input_line(machine(), "maincpu", 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 = cpu_get_reg(m_maincpu, 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
+};
+
+
+VIDEO_START_MEMBER( pegasus_state )
+{
+ 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
+};
+
+
+SCREEN_UPDATE16_MEMBER( pegasus_state )
+{
+ 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. */
+static void pegasus_decrypt_rom( running_machine &machine, UINT16 addr )
+{
+ UINT8 b, *ROM = machine.root_device().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];
+ }
+}
+
+static DEVICE_IMAGE_LOAD( pegasus_cart_1 )
+{
+ image.fread(image.device().machine().root_device().memregion("maincpu")->base() + 0x0000, 0x1000);
+ pegasus_decrypt_rom( image.device().machine(), 0x0000 );
+
+ return IMAGE_INIT_PASS;
+}
+
+static DEVICE_IMAGE_LOAD( pegasus_cart_2 )
+{
+ image.fread(image.device().machine().root_device().memregion("maincpu")->base() + 0x1000, 0x1000);
+ pegasus_decrypt_rom( image.device().machine(), 0x1000 );
+
+ return IMAGE_INIT_PASS;
+}
+
+static DEVICE_IMAGE_LOAD( pegasus_cart_3 )
+{
+ image.fread(image.device().machine().root_device().memregion("maincpu")->base() + 0x2000, 0x1000);
+ pegasus_decrypt_rom( image.device().machine(), 0x2000 );
+
+ return IMAGE_INIT_PASS;
+}
+
+static DEVICE_IMAGE_LOAD( pegasus_cart_4 )
+{
+ image.fread(image.device().machine().root_device().memregion("maincpu")->base() + 0xc000, 0x1000);
+ pegasus_decrypt_rom( image.device().machine(), 0xc000 );
+
+ return IMAGE_INIT_PASS;
+}
+
+static DEVICE_IMAGE_LOAD( pegasus_cart_5 )
+{
+ image.fread( image.device().machine().root_device().memregion("maincpu")->base() + 0xd000, 0x1000);
+ pegasus_decrypt_rom( image.device().machine(), 0xd000 );
+
+ return IMAGE_INIT_PASS;
+}
+
+MACHINE_START_MEMBER( pegasus_state )
+{
+ m_p_pcgram = memregion("pcg")->base();
+}
+
+MACHINE_RESET_MEMBER( pegasus_state )
+{
+ m_kbd_row = 0;
+ m_kbd_irq = 1;
+ m_control_bits = 0;
+}
+
+DRIVER_INIT_MEMBER(pegasus_state,pegasus)
+{
+ pegasus_decrypt_rom( machine(), 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_ADD_PERIODIC("pegasus_firq", pegasus_firq, attotime::from_hz(400)) // controls accuracy of the clock (ctrl-P)
+
+ /* 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_cart_1)
+ MCFG_CARTSLOT_ADD("cart2")
+ MCFG_CARTSLOT_EXTENSION_LIST("bin")
+ MCFG_CARTSLOT_LOAD(pegasus_cart_2)
+ MCFG_CARTSLOT_ADD("cart3")
+ MCFG_CARTSLOT_EXTENSION_LIST("bin")
+ MCFG_CARTSLOT_LOAD(pegasus_cart_3)
+ MCFG_CARTSLOT_ADD("cart4")
+ MCFG_CARTSLOT_EXTENSION_LIST("bin")
+ MCFG_CARTSLOT_LOAD(pegasus_cart_4)
+ MCFG_CARTSLOT_ADD("cart5")
+ MCFG_CARTSLOT_EXTENSION_LIST("bin")
+ MCFG_CARTSLOT_LOAD(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 )