diff options
Diffstat (limited to 'src/mame/drivers/pegasus.c')
-rw-r--r-- | src/mame/drivers/pegasus.c | 581 |
1 files changed, 581 insertions, 0 deletions
diff --git a/src/mame/drivers/pegasus.c b/src/mame/drivers/pegasus.c new file mode 100644 index 00000000000..47f09b1f0ac --- /dev/null +++ b/src/mame/drivers/pegasus.c @@ -0,0 +1,581 @@ +// license:BSD-3-Clause +// copyright-holders:Robbbert +/*************************************************************************** + + 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: + - Work on the other non-working programs + +****************************************************************************/ + +#include "emu.h" +#include "cpu/m6809/m6809.h" +#include "machine/6821pia.h" +#include "imagedev/cassette.h" +#include "sound/wave.h" +#include "bus/generic/slot.h" +#include "bus/generic/carts.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") + , m_pia_s(*this, "pia_s") + , m_pia_u(*this, "pia_u") + , m_exp_00(*this, "exp00") + , m_exp_01(*this, "exp01") + , m_exp_02(*this, "exp02") + , m_exp_0c(*this, "exp0c") + , m_exp_0d(*this, "exp0d") + , m_p_videoram(*this, "videoram") + , m_io_keyboard(*this, "KEY") + { } + + 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); + UINT32 screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect); + DECLARE_DRIVER_INIT(pegasus); + TIMER_DEVICE_CALLBACK_MEMBER(pegasus_firq); + int load_cart(device_image_interface &image, generic_slot_device *slot, const char *reg_tag); + DECLARE_DEVICE_IMAGE_LOAD_MEMBER(exp00_load) { return load_cart(image, m_exp_00, "0000"); } + DECLARE_DEVICE_IMAGE_LOAD_MEMBER(exp01_load) { return load_cart(image, m_exp_01, "1000"); } + DECLARE_DEVICE_IMAGE_LOAD_MEMBER(exp02_load) { return load_cart(image, m_exp_02, "2000"); } + DECLARE_DEVICE_IMAGE_LOAD_MEMBER(exp0c_load) { return load_cart(image, m_exp_0c, "c000"); } + DECLARE_DEVICE_IMAGE_LOAD_MEMBER(exp0d_load) { return load_cart(image, m_exp_0d, "d000"); } +private: + UINT8 m_kbd_row; + bool m_kbd_irq; + UINT8 *m_p_pcgram; + const UINT8 *m_p_chargen; + UINT8 m_control_bits; + virtual void machine_reset(); + virtual void machine_start(); + virtual void video_start(); + void pegasus_decrypt_rom(UINT8 *ROM); + 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; + required_device<generic_slot_device> m_exp_00; + required_device<generic_slot_device> m_exp_01; + required_device<generic_slot_device> m_exp_02; + required_device<generic_slot_device> m_exp_0c; + required_device<generic_slot_device> m_exp_0d; + required_shared_ptr<UINT8> m_p_videoram; + required_ioport_array<8> m_io_keyboard; +}; + +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 ) +{ + UINT8 i,data = 0xff; + for (i = 0; i < 8; i++) + if (!BIT(m_kbd_row, i)) data &= m_io_keyboard[i]->read(); + + m_kbd_irq = (data == 0xff) ? 1 : 0; + if BIT(m_control_bits, 3) + 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 BIT(m_control_bits, 1) + { + 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) // mapped by the cartslots 1-3 + AM_RANGE(0xb000, 0xbdff) AM_RAM + AM_RANGE(0xbe00, 0xbfff) AM_RAM AM_SHARE("videoram") + //AM_RANGE(0xc000, 0xdfff) // mapped by the cartslots 4-5 + 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_IMPORT_FROM(pegasus_mem) + AM_RANGE(0x5000, 0xafff) AM_RAM +ADDRESS_MAP_END + +/* Input ports */ +static INPUT_PORTS_START( pegasus ) + PORT_START("KEY.0") + 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("KEY.1") + 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("KEY.2") + 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("KEY.3") + 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("KEY.4") + 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("KEY.5") + 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("KEY.6") + 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("KEY.7") + 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 + +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; + bool pcg_mode = BIT(m_control_bits, 1); + + 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. +// The 2nd and 3rd part of a multi-rom set will have no obvious byte, +// so we check the first 4 bytes for a signature, and decrypt if found. +void pegasus_state::pegasus_decrypt_rom(UINT8 *ROM) +{ + bool doit = FALSE; + UINT8 b; + UINT16 j; + dynamic_buffer temp_copy; + temp_copy.resize(0x1000); + + if (ROM[0] == 0x02) doit = TRUE; + if (ROM[0] == 0x1e && ROM[1] == 0xfa && ROM[2] == 0x60 && ROM[3] == 0x71) doit = TRUE; // xbasic 2nd rom + if (ROM[0] == 0x72 && ROM[1] == 0x62 && ROM[2] == 0xc6 && ROM[3] == 0x36) doit = TRUE; // xbasic 3rd rom + if (ROM[0] == 0xf0 && ROM[1] == 0x40 && ROM[2] == 0xce && ROM[3] == 0x80) doit = TRUE; // forth 2nd rom (both sets) + if (ROM[0] == 0x80 && ROM[1] == 0x06 && ROM[2] == 0x68 && ROM[3] == 0x14) doit = TRUE; // pascal 2nd rom + + if (doit) + { + for (int i = 0; i < 0x1000; i++) + { + b = ROM[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); + temp_copy[j & 0xfff] = b; + } + memcpy(ROM, &temp_copy[0], 0x1000); + } +} + +int pegasus_state::load_cart(device_image_interface &image, generic_slot_device *slot, const char *reg_tag) +{ + UINT32 size = slot->common_get_size(reg_tag); + bool any_socket = false; + + if (size > 0x1000) + { + image.seterror(IMAGE_ERROR_UNSPECIFIED, "Unsupported cartridge size"); + return IMAGE_INIT_FAIL; + } + + if (image.software_entry() != NULL && size == 0) + { + // we might be loading a cart compatible with all sockets! + // so try to get region "rom" + size = slot->common_get_size("rom"); + any_socket = true; + + if (size == 0) + { + std::string errmsg; + strprintf(errmsg,"Attempted to load a file that does not work in this socket.\nPlease check \"Usage\" field in the software list for the correct socket(s) to use."); + image.seterror(IMAGE_ERROR_UNSPECIFIED, errmsg.c_str()); + return IMAGE_INIT_FAIL; + } + } + + slot->rom_alloc(0x1000, GENERIC_ROM8_WIDTH, ENDIANNESS_LITTLE); // we alloc 0x1000 also for smaller roms! + slot->common_load_rom(slot->get_rom_base(), size, any_socket ? "rom" : reg_tag); + + // raw images have to be decrypted (in particular the ones from softlist) + pegasus_decrypt_rom(slot->get_rom_base()); + + return IMAGE_INIT_PASS; +} + +void pegasus_state::machine_start() +{ + m_p_pcgram = memregion("pcg")->base(); + + if (m_exp_00->exists()) + m_maincpu->space(AS_PROGRAM).install_read_handler(0x0000, 0x0fff, read8_delegate(FUNC(generic_slot_device::read_rom),(generic_slot_device*)m_exp_00)); + if (m_exp_01->exists()) + m_maincpu->space(AS_PROGRAM).install_read_handler(0x1000, 0x1fff, read8_delegate(FUNC(generic_slot_device::read_rom),(generic_slot_device*)m_exp_01)); + if (m_exp_02->exists()) + m_maincpu->space(AS_PROGRAM).install_read_handler(0x2000, 0x2fff, read8_delegate(FUNC(generic_slot_device::read_rom),(generic_slot_device*)m_exp_02)); + if (m_exp_0c->exists()) + m_maincpu->space(AS_PROGRAM).install_read_handler(0xc000, 0xcfff, read8_delegate(FUNC(generic_slot_device::read_rom),(generic_slot_device*)m_exp_0c)); + if (m_exp_0d->exists()) + m_maincpu->space(AS_PROGRAM).install_read_handler(0xd000, 0xdfff, read8_delegate(FUNC(generic_slot_device::read_rom),(generic_slot_device*)m_exp_0d)); +} + +void pegasus_state::machine_reset() +{ + m_kbd_row = 0; + m_kbd_irq = 1; + m_control_bits = 0; +} + +DRIVER_INIT_MEMBER(pegasus_state, pegasus) +{ + // decrypt monitor + UINT8 *base = memregion("maincpu")->base() + 0xf000; + pegasus_decrypt_rom(base); +} + +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_SCREEN_PALETTE("palette") + MCFG_GFXDECODE_ADD("gfxdecode", "palette", pegasus) + MCFG_PALETTE_ADD_BLACK_AND_WHITE("palette") + + /* sound hardware */ + MCFG_SPEAKER_STANDARD_MONO("mono") + MCFG_SOUND_WAVE_ADD(WAVE_TAG, "cassette") + MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.25) + + /* devices */ + MCFG_DEVICE_ADD("pia_s", PIA6821, 0) + MCFG_PIA_READPB_HANDLER(READ8(pegasus_state, pegasus_keyboard_r)) + MCFG_PIA_READCA1_HANDLER(READLINE(pegasus_state, pegasus_cassette_r)) + MCFG_PIA_READCB1_HANDLER(READLINE(pegasus_state, pegasus_keyboard_irq)) + MCFG_PIA_WRITEPA_HANDLER(WRITE8(pegasus_state, pegasus_keyboard_w)) + MCFG_PIA_WRITEPB_HANDLER(WRITE8(pegasus_state, pegasus_controls_w)) + MCFG_PIA_CA2_HANDLER(WRITELINE(pegasus_state, pegasus_cassette_w)) + MCFG_PIA_CB2_HANDLER(WRITELINE(pegasus_state, pegasus_firq_clr)) + MCFG_PIA_IRQA_HANDLER(DEVWRITELINE("maincpu", m6809e_device, irq_line)) + MCFG_PIA_IRQB_HANDLER(DEVWRITELINE("maincpu", m6809e_device, irq_line)) + + MCFG_DEVICE_ADD("pia_u", PIA6821, 0) + MCFG_PIA_IRQA_HANDLER(DEVWRITELINE("maincpu", m6809e_device, irq_line)) + MCFG_PIA_IRQB_HANDLER(DEVWRITELINE("maincpu", m6809e_device, irq_line)) + + MCFG_GENERIC_SOCKET_ADD("exp00", generic_plain_slot, "pegasus_cart") + MCFG_GENERIC_LOAD(pegasus_state, exp00_load) + + MCFG_GENERIC_SOCKET_ADD("exp01", generic_plain_slot, "pegasus_cart") + MCFG_GENERIC_LOAD(pegasus_state, exp01_load) + + MCFG_GENERIC_SOCKET_ADD("exp02", generic_plain_slot, "pegasus_cart") + MCFG_GENERIC_LOAD(pegasus_state, exp02_load) + + MCFG_GENERIC_SOCKET_ADD("exp0c", generic_plain_slot, "pegasus_cart") + MCFG_GENERIC_LOAD(pegasus_state, exp0c_load) + + MCFG_GENERIC_SOCKET_ADD("exp0d", generic_plain_slot, "pegasus_cart") + MCFG_GENERIC_LOAD(pegasus_state, exp0d_load) + + MCFG_CASSETTE_ADD("cassette") + MCFG_CASSETTE_DEFAULT_STATE(CASSETTE_STOPPED|CASSETTE_MOTOR_ENABLED) + + /* Software lists */ + MCFG_SOFTWARE_LIST_ADD("cart_list", "pegasus_cart") +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", MACHINE_NO_SOUND_HW ) +COMP( 1981, pegasusm, pegasus, 0, pegasusm, pegasus, pegasus_state, pegasus, "Technosys", "Aamber Pegasus with RAM expansion unit", MACHINE_NO_SOUND_HW ) |