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Diffstat (limited to 'src/mame/ausnz/pegasus.cpp')
-rw-r--r-- | src/mame/ausnz/pegasus.cpp | 576 |
1 files changed, 576 insertions, 0 deletions
diff --git a/src/mame/ausnz/pegasus.cpp b/src/mame/ausnz/pegasus.cpp new file mode 100644 index 00000000000..0a7f4729a2b --- /dev/null +++ b/src/mame/ausnz/pegasus.cpp @@ -0,0 +1,576 @@ +// 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 "bus/generic/carts.h" +#include "bus/generic/slot.h" +#include "cpu/m6809/m6809.h" +#include "imagedev/cassette.h" +#include "machine/6821pia.h" +#include "machine/timer.h" + +#include "emupal.h" +#include "screen.h" +#include "softlist_dev.h" +#include "speaker.h" + + +namespace { + +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_vram(*this, "videoram") + , m_p_chargen(*this, "chargen") + , m_io_keyboard(*this, "KEY.%u", 0U) + { } + + void pegasusm(machine_config &config); + void pegasus(machine_config &config); + + void init_pegasus(); + +protected: + virtual void machine_reset() override ATTR_COLD; + virtual void machine_start() override ATTR_COLD; + +private: + u8 pegasus_keyboard_r(); + u8 pegasus_protection_r(); + u8 pegasus_pcg_r(offs_t offset); + void pegasus_controls_w(u8 data); + void pegasus_keyboard_w(u8 data); + void pegasus_pcg_w(offs_t offset, u8 data); + int pegasus_cassette_r(); + void pegasus_cassette_w(int state); + void pegasus_firq_clr(int state); + u32 screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect); + TIMER_DEVICE_CALLBACK_MEMBER(pegasus_firq); + std::pair<std::error_condition, std::string> 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"); } + + void pegasus_mem(address_map &map) ATTR_COLD; + void pegasusm_mem(address_map &map) ATTR_COLD; + + u8 m_kbd_row = 0U; + u8 m_control_bits = 0U; + std::unique_ptr<u8[]> m_pcg; + void pegasus_decrypt_rom(u8 *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<u8> m_vram; + required_region_ptr<u8> m_p_chargen; + 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); +} + +void pegasus_state::pegasus_firq_clr(int state) +{ + m_maincpu->set_input_line(M6809_FIRQ_LINE, CLEAR_LINE); +} + +u8 pegasus_state::pegasus_keyboard_r() +{ + u8 data = 0xff; + for (unsigned i = 0; i < 8; i++) + if (!BIT(m_kbd_row, i)) data &= m_io_keyboard[i]->read(); + + m_pia_s->cb1_w((data == 0xff) ? 1 : 0); + if (BIT(m_control_bits, 3)) + data <<= 4; + return data; +} + +void pegasus_state::pegasus_keyboard_w(u8 data) +{ + m_kbd_row = data; +} + +void pegasus_state::pegasus_controls_w(u8 data) +{ +/* 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; +} + +int pegasus_state::pegasus_cassette_r() +{ + return m_cass->input(); +} + +void pegasus_state::pegasus_cassette_w(int state) +{ + m_cass->output(state ? 1 : -1); +} + +u8 pegasus_state::pegasus_pcg_r(offs_t offset) +{ + u8 code = m_vram[offset] & 0x7f; + return m_pcg[(code << 4) | (~m_kbd_row & 15)]; +} + +void pegasus_state::pegasus_pcg_w(offs_t offset, u8 data) +{ +// if (BIT(m_control_bits, 1)) + { + u8 code = m_vram[offset] & 0x7f; + m_pcg[(code << 4) | (~m_kbd_row & 15)] = data; + } +} + +/* Must return the A register except when it is doing a rom search */ +u8 pegasus_state::pegasus_protection_r() +{ + u8 data = m_maincpu->state_int(M6809_A); + if (data == 0x20) data = 0xff; + return data; +} + +void pegasus_state::pegasus_mem(address_map &map) +{ + map.unmap_value_high(); + //map(0x0000, 0x2fff) // mapped by the cartslots 1-3 + map(0xb000, 0xbdff).ram(); + map(0xbe00, 0xbfff).ram().share("videoram"); + //map(0xc000, 0xdfff) // mapped by the cartslots 4-5 + map(0xe000, 0xe1ff).r(FUNC(pegasus_state::pegasus_protection_r)); + map(0xe200, 0xe3ff).rw(FUNC(pegasus_state::pegasus_pcg_r), FUNC(pegasus_state::pegasus_pcg_w)); + map(0xe400, 0xe403).mirror(0x1fc).rw(m_pia_u, FUNC(pia6821_device::read), FUNC(pia6821_device::write)); + map(0xe600, 0xe603).mirror(0x1fc).rw(m_pia_s, FUNC(pia6821_device::read), FUNC(pia6821_device::write)); + map(0xf000, 0xffff).rom().region("maincpu", 0); +} + +void pegasus_state::pegasusm_mem(address_map &map) +{ + map.unmap_value_high(); + pegasus_mem(map); + map(0x5000, 0xafff).ram(); +} + +/* 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 + +static const u8 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 +}; + + +u32 pegasus_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect) +{ + u16 sy=0, ma=0; + const bool pcg_mode = BIT(m_control_bits, 1); + + for (u8 y = 0; y < 16; y++) + { + for (u8 ra = 0; ra < 16; ra++) + { + u16 *p = &bitmap.pix(sy++); + + for (u16 x = ma; x < ma + 32; x++) + { + u8 inv = 0xff; + u8 chr = m_vram[x]; + + if (BIT(chr, 7)) + { + inv = 0; + chr &= 0x7f; + } + + u8 gfx; + if (pcg_mode) + { + gfx = m_pcg[(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( gfx_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(u8 *ROM) +{ + bool doit = false; + + 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) + { + std::vector<u8> temp_copy; + temp_copy.resize(0x1000); + for (int i = 0; i < 0x1000; i++) + { + const u16 j = bitswap<16>(i, 15, 14, 13, 12, 11, 10, 9, 8, 0, 1, 2, 3, 4, 5, 6, 7); + const u8 b = bitswap<8>(ROM[i], 3, 2, 1, 0, 7, 6, 5, 4); + temp_copy[j & 0xfff] = b; + } + memcpy(ROM, &temp_copy[0], 0x1000); + } +} + +std::pair<std::error_condition, std::string> pegasus_state::load_cart(device_image_interface &image, generic_slot_device *slot, const char *reg_tag) +{ + u32 size = slot->common_get_size(reg_tag); + bool any_socket = false; + + if (size > 0x1000) + return std::make_pair(image_error::INVALIDLENGTH, "Unsupported cartridge size (must be no larger than 4K)"); + + if (image.loaded_through_softlist() && 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) + { + // FIXME: multi-line message may not be displayed properly + return std::make_pair( + image_error::INVALIDIMAGE, + "Attempted to load a file that does not work in this socket.\n" + "Please check \"Usage\" field in the software list for the correct socket(s) to use."); + } + } + + 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 std::make_pair(std::error_condition(), std::string()); +} + +void pegasus_state::machine_start() +{ + if (m_exp_00->exists()) + m_maincpu->space(AS_PROGRAM).install_read_handler(0x0000, 0x0fff, read8sm_delegate(*m_exp_00, FUNC(generic_slot_device::read_rom))); + if (m_exp_01->exists()) + m_maincpu->space(AS_PROGRAM).install_read_handler(0x1000, 0x1fff, read8sm_delegate(*m_exp_01, FUNC(generic_slot_device::read_rom))); + if (m_exp_02->exists()) + m_maincpu->space(AS_PROGRAM).install_read_handler(0x2000, 0x2fff, read8sm_delegate(*m_exp_02, FUNC(generic_slot_device::read_rom))); + if (m_exp_0c->exists()) + m_maincpu->space(AS_PROGRAM).install_read_handler(0xc000, 0xcfff, read8sm_delegate(*m_exp_0c, FUNC(generic_slot_device::read_rom))); + if (m_exp_0d->exists()) + m_maincpu->space(AS_PROGRAM).install_read_handler(0xd000, 0xdfff, read8sm_delegate(*m_exp_0d, FUNC(generic_slot_device::read_rom))); + m_pcg = make_unique_clear<u8[]>(0x0800); + save_pointer(NAME(m_pcg), 0x0800); + save_item(NAME(m_kbd_row)); + save_item(NAME(m_control_bits)); +} + +void pegasus_state::machine_reset() +{ + m_kbd_row = 0; + m_pia_s->cb1_w(1); + m_control_bits = 0; +} + +void pegasus_state::init_pegasus() +{ + // decrypt monitor + u8 *base = memregion("maincpu")->base(); + pegasus_decrypt_rom(base); +} + +void pegasus_state::pegasus(machine_config &config) +{ + /* basic machine hardware */ + MC6809(config, m_maincpu, XTAL(4'000'000)); // actually a 6809C - 4MHZ clock coming in, 1MHZ internally + m_maincpu->set_addrmap(AS_PROGRAM, &pegasus_state::pegasus_mem); + + TIMER(config, "pegasus_firq").configure_periodic(FUNC(pegasus_state::pegasus_firq), attotime::from_hz(400)); + + /* video hardware */ + screen_device &screen(SCREEN(config, "screen", SCREEN_TYPE_RASTER)); + screen.set_refresh_hz(50); + screen.set_vblank_time(ATTOSECONDS_IN_USEC(2500)); /* not accurate */ + screen.set_screen_update(FUNC(pegasus_state::screen_update)); + screen.set_size(32*8, 16*16); + screen.set_visarea(0, 32*8-1, 0, 16*16-1); + screen.set_palette("palette"); + GFXDECODE(config, "gfxdecode", "palette", gfx_pegasus); + PALETTE(config, "palette", palette_device::MONOCHROME); + + /* sound hardware */ + SPEAKER(config, "mono").front_center(); + + /* devices */ + PIA6821(config, m_pia_s); + m_pia_s->readpb_handler().set(FUNC(pegasus_state::pegasus_keyboard_r)); + m_pia_s->readca1_handler().set(FUNC(pegasus_state::pegasus_cassette_r)); + m_pia_s->writepa_handler().set(FUNC(pegasus_state::pegasus_keyboard_w)); + m_pia_s->writepb_handler().set(FUNC(pegasus_state::pegasus_controls_w)); + m_pia_s->ca2_handler().set(FUNC(pegasus_state::pegasus_cassette_w)); + m_pia_s->cb2_handler().set(FUNC(pegasus_state::pegasus_firq_clr)); + m_pia_s->irqa_handler().set_inputline("maincpu", M6809_IRQ_LINE); + m_pia_s->irqb_handler().set_inputline("maincpu", M6809_IRQ_LINE); + + PIA6821(config, m_pia_u); + m_pia_u->irqa_handler().set_inputline("maincpu", M6809_IRQ_LINE); + m_pia_u->irqb_handler().set_inputline("maincpu", M6809_IRQ_LINE); + + GENERIC_SOCKET(config, "exp00", generic_plain_slot, "pegasus_cart").set_device_load(FUNC(pegasus_state::exp00_load)); + GENERIC_SOCKET(config, "exp01", generic_plain_slot, "pegasus_cart").set_device_load(FUNC(pegasus_state::exp01_load)); + GENERIC_SOCKET(config, "exp02", generic_plain_slot, "pegasus_cart").set_device_load(FUNC(pegasus_state::exp02_load)); + GENERIC_SOCKET(config, "exp0c", generic_plain_slot, "pegasus_cart").set_device_load(FUNC(pegasus_state::exp0c_load)); + GENERIC_SOCKET(config, "exp0d", generic_plain_slot, "pegasus_cart").set_device_load(FUNC(pegasus_state::exp0d_load)); + + CASSETTE(config, m_cass); + m_cass->set_default_state(CASSETTE_STOPPED|CASSETTE_MOTOR_ENABLED); + m_cass->add_route(ALL_OUTPUTS, "mono", 0.05); + + /* Software lists */ + SOFTWARE_LIST(config, "cart_list").set_original("pegasus_cart"); +} + +void pegasus_state::pegasusm(machine_config &config) +{ + pegasus(config); + m_maincpu->set_addrmap(AS_PROGRAM, &pegasus_state::pegasusm_mem); +} + + +/* ROM definition */ +ROM_START( pegasus ) + ROM_REGION( 0x1000, "maincpu", ROMREGION_ERASEFF ) + ROM_SYSTEM_BIOS(0, "11r2674", "Monitor 1.1 r2674") + ROMX_LOAD( "mon11_2674.bin", 0x0000, 0x1000, CRC(1640ff7e) SHA1(8199643749fb40fb8be05e9f311c75620ca939b1), ROM_BIOS(0) ) + ROM_SYSTEM_BIOS(1, "10r2569", "Monitor 1.0 r2569") + ROMX_LOAD( "mon10_2569.bin", 0x0000, 0x1000, CRC(910fc930) SHA1(a4f6bbe5def0268cc49ee7045616a39017dd8052), ROM_BIOS(1) ) + ROM_SYSTEM_BIOS(2, "11r2569", "Monitor 1.1 r2569") + ROMX_LOAD( "mon11_2569.bin", 0x0000, 0x1000, CRC(07b92002) SHA1(3c434601120870c888944ecd9ade5186432ddbc2), ROM_BIOS(2) ) + ROM_SYSTEM_BIOS(3, "11r2669", "Monitor 1.1 r2669") + ROMX_LOAD( "mon11_2669.bin", 0x0000, 0x1000, CRC(f3ee23c8) SHA1(3ac96935668f5e53799c90db5140393c2ef9ce36), ROM_BIOS(3) ) + ROM_SYSTEM_BIOS(4, "22r2856", "Monitor 2.2 r2856") + ROMX_LOAD( "mon22_2856.bin", 0x0000, 0x1000, CRC(5f5f688a) SHA1(3719eecc347e158dd027ea7aa8a068cdafc00d9b), ROM_BIOS(4) ) + ROM_SYSTEM_BIOS(5, "22br2856", "Monitor 2.2B r2856") + ROMX_LOAD( "mon22b_2856.bin", 0x0000, 0x1000, CRC(a47b0308) SHA1(f215e51aa8df6aed99c10f3df6a3589cb9f63d46), ROM_BIOS(5) ) + ROM_SYSTEM_BIOS(6, "23r2601", "Monitor 2.3 r2601") + ROMX_LOAD( "mon23_2601.bin", 0x0000, 0x1000, CRC(0e024222) SHA1(9950cba08996931b9d5a3368b44c7309638b4e08), ROM_BIOS(6) ) + ROM_SYSTEM_BIOS(7, "23ar2569", "Monitor 2.3A r2569") + ROMX_LOAD( "mon23a_2569.bin", 0x0000, 0x1000, CRC(248e62c9) SHA1(adbde27e69b38b29ff89bacf28d0240a8e5d90f3), ROM_BIOS(7) ) + + ROM_REGION( 0x0800, "chargen", 0 ) + ROM_LOAD( "6571.bin", 0x0000, 0x0800, CRC(5a25144b) SHA1(7b9fee0c8ef2605b85d12b6d9fe8feb82418c63a) ) +ROM_END + +#define rom_pegasusm rom_pegasus + +} // anonymous namespace + + +/* Driver */ + +// YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS +COMP( 1981, pegasus, 0, 0, pegasus, pegasus, pegasus_state, init_pegasus, "Technosys", "Aamber Pegasus", MACHINE_NO_SOUND_HW | MACHINE_SUPPORTS_SAVE ) +COMP( 1981, pegasusm, pegasus, 0, pegasusm, pegasus, pegasus_state, init_pegasus, "Technosys", "Aamber Pegasus with RAM expansion unit", MACHINE_NO_SOUND_HW | MACHINE_SUPPORTS_SAVE ) |