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+// 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 )