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Diffstat (limited to 'src/mame/drivers/vixen.cpp')
-rw-r--r-- | src/mame/drivers/vixen.cpp | 842 |
1 files changed, 842 insertions, 0 deletions
diff --git a/src/mame/drivers/vixen.cpp b/src/mame/drivers/vixen.cpp new file mode 100644 index 00000000000..5606330d627 --- /dev/null +++ b/src/mame/drivers/vixen.cpp @@ -0,0 +1,842 @@ +// license:BSD-3-Clause +// copyright-holders:Curt Coder, Robbbert +/* + +Osborne 4 Vixen + +Main PCB Layout +--------------- + +TODO + +Notes: + Relevant IC's shown. + + CPU - Zilog Z8400APS Z80A CPU + FDC - SMC FDC1797 + 8155 - Intel P8155H + ROM0 - + ROM1,2 - AMD AM2732-1DC 4Kx8 EPROM + CN1 - keyboard connector + CN2 - + CN3 - + CN4 - floppy connector + CN5 - power connector + CN6 - composite video connector + SW1 - reset switch + SW2 - + + +I/O PCB Layout +-------------- + +TODO + +Notes: + Relevant IC's shown. + + 8155 - Intel P8155H + 8251 - AMD P8251A + CN1 - IEEE488 connector + CN2 - RS232 connector + CN3 - + +*/ + +/* + + TODO: + + - RS232 RI interrupt + - PCB layouts + +*/ + + +#include "includes/vixen.h" +#include "softlist.h" + + +//************************************************************************** +// INTERRUPTS +//************************************************************************** + +//------------------------------------------------- +// update_interrupt - +//------------------------------------------------- + +void vixen_state::update_interrupt() +{ + int state = (m_cmd_d1 && m_fdint) || m_vsync;// || (!m_enb_srq_int && !m_srq) || (!m_enb_atn_int && !m_atn) || (!m_enb_xmt_int && m_txrdy) || (!m_enb_rcv_int && m_rxrdy); + + m_maincpu->set_input_line(INPUT_LINE_IRQ0, state ? ASSERT_LINE : CLEAR_LINE); +} + + +READ8_MEMBER( vixen_state::opram_r ) +{ + membank("bank3")->set_entry(0); // read videoram + return m_program->read_byte(offset); +} + +READ8_MEMBER( vixen_state::oprom_r ) +{ + membank("bank3")->set_entry(1); // read rom + return m_rom[offset]; +} + +//------------------------------------------------- +// status_r - status read +//------------------------------------------------- + +READ8_MEMBER( vixen_state::status_r ) +{ + /* + + bit description + + 0 VSYNC enable + 1 FDINT enable + 2 VSYNC + 3 1 + 4 1 + 5 1 + 6 1 + 7 1 + + */ + + UINT8 data = 0xf8; + + // vertical sync interrupt enable + data |= m_cmd_d0; + + // floppy interrupt enable + data |= m_cmd_d1 << 1; + + // vertical sync + data |= m_vsync << 2; + + return data; +} + + +//------------------------------------------------- +// cmd_w - command write +//------------------------------------------------- + +WRITE8_MEMBER( vixen_state::cmd_w ) +{ + /* + + bit description + + 0 VSYNC enable + 1 FDINT enable + 2 + 3 + 4 + 5 + 6 + 7 + + */ + +// logerror("CMD %u\n", data); + + // vertical sync interrupt enable + m_cmd_d0 = BIT(data, 0); + + if (!m_cmd_d0) + { + // clear vertical sync + m_vsync = 0; + } + + // floppy interrupt enable + m_cmd_d1 = BIT(data, 1); + + update_interrupt(); +} + + +//------------------------------------------------- +// ieee488_r - IEEE488 bus read +//------------------------------------------------- + +READ8_MEMBER( vixen_state::ieee488_r ) +{ + /* + + bit description + + 0 ATN + 1 DAV + 2 NDAC + 3 NRFD + 4 EOI + 5 SRQ + 6 IFC + 7 REN + + */ + + UINT8 data = 0; + + /* attention */ + data |= m_ieee488->atn_r(); + + /* data valid */ + data |= m_ieee488->dav_r() << 1; + + /* data not accepted */ + data |= m_ieee488->ndac_r() << 2; + + /* not ready for data */ + data |= m_ieee488->nrfd_r() << 3; + + /* end or identify */ + data |= m_ieee488->eoi_r() << 4; + + /* service request */ + data |= m_ieee488->srq_r() << 5; + + /* interface clear */ + data |= m_ieee488->ifc_r() << 6; + + /* remote enable */ + data |= m_ieee488->ren_r() << 7; + + return data; +} + + +//------------------------------------------------- +// port3_r - serial status read +//------------------------------------------------- + +READ8_MEMBER( vixen_state::port3_r ) +{ + /* + + bit description + + 0 RI + 1 DCD + 2 1 + 3 1 + 4 1 + 5 1 + 6 1 + 7 1 + + */ + + UINT8 data = 0xfc; + + // ring indicator + data |= m_rs232->ri_r(); + + // data carrier detect + data |= m_rs232->dcd_r() << 1; + + return data; +} + + + +//************************************************************************** +// ADDRESS MAPS +//************************************************************************** + +//------------------------------------------------- +// ADDRESS_MAP( vixen_mem ) +//------------------------------------------------- + +// when M1 is inactive: read and write of data +static ADDRESS_MAP_START( vixen_mem, AS_PROGRAM, 8, vixen_state ) + ADDRESS_MAP_UNMAP_HIGH + AM_RANGE(0x0000, 0xefff) AM_RAM + AM_RANGE(0xf000, 0xffff) AM_READ_BANK("bank3") AM_WRITE_BANK("bank4") AM_SHARE("video_ram") +ADDRESS_MAP_END + +// when M1 is active: read opcodes +static ADDRESS_MAP_START( bios_mem, AS_DECRYPTED_OPCODES, 8, vixen_state ) + ADDRESS_MAP_UNMAP_HIGH + AM_RANGE(0x0000, 0xefff) AM_READ(opram_r) + AM_RANGE(0xf000, 0xffff) AM_READ(oprom_r) +ADDRESS_MAP_END + + +//------------------------------------------------- +// ADDRESS_MAP( vixen_io ) +//------------------------------------------------- + +static ADDRESS_MAP_START( vixen_io, AS_IO, 8, vixen_state ) + ADDRESS_MAP_UNMAP_HIGH + ADDRESS_MAP_GLOBAL_MASK(0xff) + AM_RANGE(0x00, 0x03) AM_DEVREADWRITE(FDC1797_TAG, fd1797_t, read, write) + AM_RANGE(0x04, 0x04) AM_MIRROR(0x03) AM_READWRITE(status_r, cmd_w) + AM_RANGE(0x08, 0x08) AM_MIRROR(0x01) AM_DEVREADWRITE(P8155H_TAG, i8155_device, read, write) + AM_RANGE(0x0c, 0x0d) AM_DEVWRITE(P8155H_TAG, i8155_device, ale_w) + AM_RANGE(0x10, 0x10) AM_MIRROR(0x07) AM_DEVREAD(IEEE488_TAG, ieee488_device, dio_r) + AM_RANGE(0x18, 0x18) AM_MIRROR(0x07) AM_READ(ieee488_r) + AM_RANGE(0x20, 0x21) AM_MIRROR(0x04) AM_DEVWRITE(P8155H_IO_TAG, i8155_device, ale_w) + AM_RANGE(0x28, 0x28) AM_MIRROR(0x05) AM_DEVREADWRITE(P8155H_IO_TAG, i8155_device, read, write) + AM_RANGE(0x30, 0x30) AM_MIRROR(0x06) AM_DEVREADWRITE(P8251A_TAG, i8251_device, data_r, data_w) + AM_RANGE(0x31, 0x31) AM_MIRROR(0x06) AM_DEVREADWRITE(P8251A_TAG, i8251_device, status_r, control_w) + AM_RANGE(0x38, 0x38) AM_MIRROR(0x07) AM_READ(port3_r) +// AM_RANGE(0xf0, 0xff) Hard Disk? +ADDRESS_MAP_END + + + +//************************************************************************** +// INPUT PORTS +//************************************************************************** + +//------------------------------------------------- +// INPUT_PORTS( vixen ) +//------------------------------------------------- + +INPUT_PORTS_START( vixen ) + PORT_START("KEY.0") + PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("ESC") PORT_CODE(KEYCODE_ESC) PORT_CHAR(0x1B) + PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_TAB) PORT_CHAR(0x09) + PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("CTRL") PORT_CODE(KEYCODE_LCONTROL) PORT_CODE(KEYCODE_RCONTROL) PORT_CHAR(UCHAR_SHIFT_2) + PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("LOCK") PORT_CODE(KEYCODE_CAPSLOCK) PORT_TOGGLE + PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("SHIFT") PORT_CODE(KEYCODE_LSHIFT) PORT_CODE(KEYCODE_RSHIFT) PORT_CHAR(UCHAR_SHIFT_1) + PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_ENTER) PORT_CHAR(0x0D) + PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_QUOTE) PORT_CHAR(0x27) PORT_CHAR(0x22) + PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_OPENBRACE) PORT_CHAR('[') PORT_CHAR(']') + + PORT_START("KEY.1") + PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_1) PORT_CHAR('1') PORT_CHAR('!') + PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_2) PORT_CHAR('2') PORT_CHAR('@') + PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_3) PORT_CHAR('3') PORT_CHAR('#') + PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_4) PORT_CHAR('4') PORT_CHAR('$') + PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_5) PORT_CHAR('5') PORT_CHAR('%') + PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_6) PORT_CHAR('6') PORT_CHAR('^') + PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_7) PORT_CHAR('7') PORT_CHAR('&') + PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_8) PORT_CHAR('8') PORT_CHAR('*') + + PORT_START("KEY.2") + PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("Q") PORT_CODE(KEYCODE_Q) PORT_CHAR('Q') PORT_CHAR('q') PORT_CHAR(0x11) + PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("W") PORT_CODE(KEYCODE_W) PORT_CHAR('W') PORT_CHAR('w') PORT_CHAR(0x17) + PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("E") PORT_CODE(KEYCODE_E) PORT_CHAR('E') PORT_CHAR('e') PORT_CHAR(0x05) + PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("R") PORT_CODE(KEYCODE_R) PORT_CHAR('R') PORT_CHAR('r') PORT_CHAR(0x12) + PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("T") PORT_CODE(KEYCODE_T) PORT_CHAR('T') PORT_CHAR('t') PORT_CHAR(0x14) + PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("Y") PORT_CODE(KEYCODE_Y) PORT_CHAR('Y') PORT_CHAR('y') PORT_CHAR(0x19) + PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("U") PORT_CODE(KEYCODE_U) PORT_CHAR('U') PORT_CHAR('u') PORT_CHAR(0x15) + PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("I") PORT_CODE(KEYCODE_I) PORT_CHAR('I') PORT_CHAR('i') PORT_CHAR(0x09) + + PORT_START("KEY.3") + PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("A") PORT_CODE(KEYCODE_A) PORT_CHAR('A') PORT_CHAR('a') PORT_CHAR(0x01) + PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("S") PORT_CODE(KEYCODE_S) PORT_CHAR('S') PORT_CHAR('s') PORT_CHAR(0x13) + PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("D") PORT_CODE(KEYCODE_D) PORT_CHAR('D') PORT_CHAR('d') PORT_CHAR(0x04) + PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("F") PORT_CODE(KEYCODE_F) PORT_CHAR('F') PORT_CHAR('f') PORT_CHAR(0x06) + PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("G") PORT_CODE(KEYCODE_G) PORT_CHAR('G') PORT_CHAR('g') PORT_CHAR(0x07) + PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("H") PORT_CODE(KEYCODE_H) PORT_CHAR('H') PORT_CHAR('h') PORT_CHAR(0x08) + PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("J") PORT_CODE(KEYCODE_J) PORT_CHAR('J') PORT_CHAR('j') PORT_CHAR(0x0a) + PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("K") PORT_CODE(KEYCODE_K) PORT_CHAR('K') PORT_CHAR('k') PORT_CHAR(0x0b) + + PORT_START("KEY.4") + PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("Z") PORT_CODE(KEYCODE_Z) PORT_CHAR('Z') PORT_CHAR('z') PORT_CHAR(0x1a) + PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("X") PORT_CODE(KEYCODE_X) PORT_CHAR('X') PORT_CHAR('x') PORT_CHAR(0x18) + PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("C") PORT_CODE(KEYCODE_C) PORT_CHAR('C') PORT_CHAR('c') PORT_CHAR(0x03) + PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("V") PORT_CODE(KEYCODE_V) PORT_CHAR('V') PORT_CHAR('v') PORT_CHAR(0x16) + PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("B") PORT_CODE(KEYCODE_B) PORT_CHAR('B') PORT_CHAR('b') PORT_CHAR(0x02) + PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("N") PORT_CODE(KEYCODE_N) PORT_CHAR('N') PORT_CHAR('n') PORT_CHAR(0x0e) + PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("M") PORT_CODE(KEYCODE_M) PORT_CHAR('M') PORT_CHAR('m') PORT_CHAR(0x0d) + PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_COMMA) PORT_CHAR(',') PORT_CHAR('<') + + PORT_START("KEY.5") + PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("UP") PORT_CODE(KEYCODE_UP) + PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_LEFT) PORT_CODE(KEYCODE_BACKSPACE) PORT_CHAR(8) + PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_0) PORT_CHAR('0') PORT_CHAR(')') + PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_SPACE) PORT_CHAR(' ') + PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_STOP) PORT_CHAR('.') PORT_CHAR('>') + PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("P") PORT_CODE(KEYCODE_P) PORT_CHAR('P') PORT_CHAR('p') PORT_CHAR(0x10) + PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("O") PORT_CODE(KEYCODE_O) PORT_CHAR('O') PORT_CHAR('o') PORT_CHAR(0x0f) + PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_9) PORT_CHAR('9') PORT_CHAR('(') + + PORT_START("KEY.6") + PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("RIGHT") PORT_CODE(KEYCODE_RIGHT) + PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("DOWN") PORT_CODE(KEYCODE_DOWN) + PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("- _") PORT_CODE(KEYCODE_MINUS) PORT_CHAR('-') PORT_CHAR('_') PORT_CHAR(0x1F) + PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_SLASH) PORT_CHAR('/') PORT_CHAR('?') PORT_CHAR(0x7E) + PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_COLON) PORT_CHAR(';') PORT_CHAR(':') + PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("\\ |") PORT_CODE(KEYCODE_BACKSLASH) PORT_CHAR('\\') PORT_CHAR('|') PORT_CHAR(0x1C) + PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_L) PORT_CHAR('L') PORT_CHAR('l') + PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_EQUALS) PORT_CHAR('=') PORT_CHAR('+') PORT_CHAR(0x60) + + PORT_START("KEY.7") + PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("DEL") PORT_CODE(KEYCODE_DEL) PORT_CHAR(127) + PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_CLOSEBRACE) PORT_CHAR('{') PORT_CHAR('}') + PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_UNUSED ) + PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_UNUSED ) + PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_UNUSED ) + PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_UNUSED ) + PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_UNUSED ) + PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("FUNC") PORT_CODE(KEYCODE_END) +INPUT_PORTS_END + + + +//************************************************************************** +// VIDEO +//************************************************************************** + +//------------------------------------------------- +// TIMER_DEVICE_CALLBACK_MEMBER( vsync_tick ) +//------------------------------------------------- + +TIMER_DEVICE_CALLBACK_MEMBER(vixen_state::vsync_tick) +{ + if (m_cmd_d0) + { + m_vsync = 1; + update_interrupt(); + } +} + + +void vixen_state::video_start() +{ + // register for state saving + save_item(NAME(m_alt)); + save_item(NAME(m_256)); + save_item(NAME(m_vsync)); +} + + +//------------------------------------------------- +// SCREEN_UPDATE( vixen ) +//------------------------------------------------- + +UINT32 vixen_state::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect) +{ + const pen_t *pen = m_palette->pens(); + UINT8 x, y, chr, gfx, inv, ra; + + for (y = 0; y < 26; y++) + { + for (ra = 0; ra < 10; ra++) + { + for (x = 0; x < 128; x++) + { + UINT16 sync_addr = ((y+1) << 7) + x + 1; // it's out by a row and a column + UINT8 sync_data = m_sync_rom[sync_addr & 0xfff]; + bool blank = BIT(sync_data, 4); + /* + int clrchadr = BIT(sync_data, 7); + int hsync = BIT(sync_data, 6); + int clrtxadr = BIT(sync_data, 5); + int vsync = BIT(sync_data, 3); + int comp_sync = BIT(sync_data, 2); + + logerror("SYNC %03x:%02x TXADR %u SCAN %u CHADR %u : COMPSYNC %u VSYNC %u BLANK %u CLRTXADR %u HSYNC %u CLRCHADR %u\n", + sync_addr,sync_data,txadr,scan,chadr,comp_sync,vsync,blank,clrtxadr,hsync,clrchadr); + */ + + chr = m_video_ram[(y<<7) + x]; + + if (m_256) + { + gfx = m_char_rom[(BIT(chr, 7) << 11) | (ra << 7) | (chr & 0x7f)]; + inv = m_alt ? 0xff : 0; + } + else + { + gfx = m_char_rom[(ra << 7) | (chr & 0x7f)]; + inv = BIT(chr, 7) ? 0xff : 0; + } + + gfx = (blank) ? 0 : (gfx ^ inv); + + for (int b = 0; b < 8; b++) + { + int color = BIT(gfx, 7 - b); + + bitmap.pix32((y * 10) + ra, (x * 8) + b) = pen[color]; + } + } + } + } + + return 0; +} + + + +//************************************************************************** +// SOUND +//************************************************************************** + +//------------------------------------------------- +// DISCRETE_SOUND( vixen ) +//------------------------------------------------- + +static DISCRETE_SOUND_START( vixen ) + DISCRETE_INPUT_LOGIC(NODE_01) + DISCRETE_SQUAREWAVE(NODE_02, NODE_01, XTAL_23_9616MHz/15360, 100, 50, 0, 90) + DISCRETE_OUTPUT(NODE_02, 2000) +DISCRETE_SOUND_END + + + +//************************************************************************** +// DEVICE CONFIGURATION +//************************************************************************** + +//------------------------------------------------- +// I8155 interface +//------------------------------------------------- + +READ8_MEMBER( vixen_state::i8155_pa_r ) +{ + UINT8 data = 0xff; + + for (int i = 0; i < 8; i++) + if (!BIT(m_col, i)) data &= m_key[i]->read(); + + return data; +} + +WRITE8_MEMBER( vixen_state::i8155_pb_w ) +{ + m_col = data; +} + +WRITE8_MEMBER( vixen_state::i8155_pc_w ) +{ + /* + + bit description + + 0 DSEL1/ + 1 DSEL2/ + 2 DDEN/ + 3 ALT CHARSET/ + 4 256 CHARS + 5 BEEP ENABLE + 6 + 7 + + */ + + // drive select + floppy_image_device *floppy = NULL; + + if (!BIT(data, 0)) floppy = m_floppy0->get_device(); + if (!BIT(data, 1)) floppy = m_floppy1->get_device(); + + m_fdc->set_floppy(floppy); + + if (floppy) floppy->mon_w(0); + + // density select + m_fdc->dden_w(BIT(data, 2)); + + // charset + m_alt = !BIT(data, 3); + m_256 = !BIT(data, 4); + + // beep enable + m_discrete->write(space, NODE_01, !BIT(data, 5)); +} + +//------------------------------------------------- +// I8155 IO interface +//------------------------------------------------- + +WRITE8_MEMBER( vixen_state::io_i8155_pb_w ) +{ + /* + + bit description + + PB0 ATN + PB1 DAV + PB2 NDAC + PB3 NRFD + PB4 EOI + PB5 SRQ + PB6 IFC + PB7 REN + + */ + + /* data valid */ + m_ieee488->atn_w(BIT(data, 0)); + + /* end or identify */ + m_ieee488->dav_w(BIT(data, 1)); + + /* remote enable */ + m_ieee488->ndac_w(BIT(data, 2)); + + /* attention */ + m_ieee488->nrfd_w(BIT(data, 3)); + + /* interface clear */ + m_ieee488->eoi_w(BIT(data, 4)); + + /* service request */ + m_ieee488->srq_w(BIT(data, 5)); + + /* not ready for data */ + m_ieee488->ifc_w(BIT(data, 6)); + + /* data not accepted */ + m_ieee488->ren_w(BIT(data, 7)); +} + +WRITE8_MEMBER( vixen_state::io_i8155_pc_w ) +{ + /* + + bit description + + PC0 select internal clock + PC1 ENB RING INT + PC2 ENB RCV INT + PC3 ENB XMT INT + PC4 ENB ATN INT + PC5 ENB SRQ INT + PC6 + PC7 + + */ + + m_int_clk = BIT(data, 0); + m_enb_ring_int = BIT(data, 1); + m_enb_rcv_int = BIT(data, 2); + m_enb_xmt_int = BIT(data, 3); + m_enb_atn_int = BIT(data, 4); + m_enb_srq_int = BIT(data, 5); +} + +WRITE_LINE_MEMBER( vixen_state::io_i8155_to_w ) +{ + if (m_int_clk) + { + m_usart->write_txc(state); + m_usart->write_rxc(state); + } +} + +//------------------------------------------------- +// i8251_interface usart_intf +//------------------------------------------------- + +WRITE_LINE_MEMBER( vixen_state::rxrdy_w ) +{ + m_rxrdy = state; + update_interrupt(); +} + +WRITE_LINE_MEMBER( vixen_state::txrdy_w ) +{ + m_txrdy = state; + update_interrupt(); +} + +//------------------------------------------------- +// IEEE488_INTERFACE( ieee488_intf ) +//------------------------------------------------- + +WRITE_LINE_MEMBER( vixen_state::srq_w ) +{ + m_srq = state; + update_interrupt(); +} + +WRITE_LINE_MEMBER( vixen_state::atn_w ) +{ + m_atn = state; + update_interrupt(); +} + +static SLOT_INTERFACE_START( vixen_floppies ) + SLOT_INTERFACE( "525dd", FLOPPY_525_DD ) +SLOT_INTERFACE_END + +WRITE_LINE_MEMBER( vixen_state::fdc_intrq_w ) +{ + m_fdint = state; + update_interrupt(); +} + + + +//************************************************************************** +// MACHINE INITIALIZATION +//************************************************************************** + +//------------------------------------------------- +// IRQ_CALLBACK_MEMBER( vixen_int_ack ) +//------------------------------------------------- + +IRQ_CALLBACK_MEMBER(vixen_state::vixen_int_ack) +{ + // D0 is pulled low + return 0xfe; +} + + +//------------------------------------------------- +// MACHINE_START( vixen ) +//------------------------------------------------- + +void vixen_state::machine_start() +{ + // configure memory banking + + membank("bank3")->configure_entry(0, m_video_ram); + membank("bank3")->configure_entry(1, m_rom); + + membank("bank4")->configure_entry(0, m_video_ram); + + // register for state saving + save_item(NAME(m_col)); + save_item(NAME(m_cmd_d0)); + save_item(NAME(m_cmd_d1)); + save_item(NAME(m_fdint)); +} + + +void vixen_state::machine_reset() +{ + membank("bank3")->set_entry(1); + + m_vsync = 0; + m_cmd_d0 = 0; + m_cmd_d1 = 0; + update_interrupt(); + + m_fdc->reset(); + m_io_i8155->reset(); + m_usart->reset(); + m_maincpu->set_state_int(Z80_PC, 0xf000); +} + + + +//************************************************************************** +// MACHINE CONFIGURATION +//************************************************************************** + +//------------------------------------------------- +// MACHINE_CONFIG( vixen ) +//------------------------------------------------- + +static MACHINE_CONFIG_START( vixen, vixen_state ) + // basic machine hardware + MCFG_CPU_ADD(Z8400A_TAG, Z80, XTAL_23_9616MHz/6) + MCFG_CPU_PROGRAM_MAP(vixen_mem) + MCFG_CPU_DECRYPTED_OPCODES_MAP(bios_mem) + MCFG_CPU_IO_MAP(vixen_io) + MCFG_CPU_IRQ_ACKNOWLEDGE_DRIVER(vixen_state,vixen_int_ack) + + // video hardware + MCFG_SCREEN_ADD(SCREEN_TAG, RASTER) + MCFG_SCREEN_UPDATE_DRIVER(vixen_state, screen_update) + MCFG_SCREEN_RAW_PARAMS(XTAL_23_9616MHz/2, 96*8, 0*8, 81*8, 27*10, 0*10, 26*10) + + MCFG_TIMER_DRIVER_ADD_SCANLINE("vsync", vixen_state, vsync_tick, SCREEN_TAG, 26*10, 27*10) + + MCFG_PALETTE_ADD_MONOCHROME_AMBER("palette") + + // sound hardware + MCFG_SPEAKER_STANDARD_MONO("mono") + MCFG_SOUND_ADD(DISCRETE_TAG, DISCRETE, 0) + MCFG_DISCRETE_INTF(vixen) + MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.20) + + // devices + MCFG_DEVICE_ADD(P8155H_TAG, I8155, XTAL_23_9616MHz/6) + MCFG_I8155_IN_PORTA_CB(READ8(vixen_state, i8155_pa_r)) + MCFG_I8155_OUT_PORTB_CB(WRITE8(vixen_state, i8155_pb_w)) + MCFG_I8155_OUT_PORTC_CB(WRITE8(vixen_state, i8155_pc_w)) + + MCFG_DEVICE_ADD(P8155H_IO_TAG, I8155, XTAL_23_9616MHz/6) + MCFG_I8155_OUT_PORTA_CB(DEVWRITE8(IEEE488_TAG, ieee488_device, dio_w)) + MCFG_I8155_OUT_PORTB_CB(WRITE8(vixen_state, io_i8155_pb_w)) + MCFG_I8155_OUT_PORTC_CB(WRITE8(vixen_state, io_i8155_pc_w)) + MCFG_I8155_OUT_TIMEROUT_CB(WRITELINE(vixen_state, io_i8155_to_w)) + + MCFG_DEVICE_ADD(P8251A_TAG, I8251, 0) + MCFG_I8251_TXD_HANDLER(DEVWRITELINE(RS232_TAG, rs232_port_device, write_txd)) + MCFG_I8251_DTR_HANDLER(DEVWRITELINE(RS232_TAG, rs232_port_device, write_dtr)) + MCFG_I8251_RTS_HANDLER(DEVWRITELINE(RS232_TAG, rs232_port_device, write_rts)) + MCFG_I8251_RXRDY_HANDLER(WRITELINE(vixen_state, rxrdy_w)) + MCFG_I8251_TXRDY_HANDLER(WRITELINE(vixen_state, txrdy_w)) + + MCFG_RS232_PORT_ADD(RS232_TAG, default_rs232_devices, NULL) + MCFG_RS232_RXD_HANDLER(DEVWRITELINE(P8251A_TAG, i8251_device, write_rxd)) + MCFG_RS232_DSR_HANDLER(DEVWRITELINE(P8251A_TAG, i8251_device, write_dsr)) + + MCFG_FD1797_ADD(FDC1797_TAG, XTAL_23_9616MHz/24) + MCFG_WD_FDC_INTRQ_CALLBACK(WRITELINE(vixen_state, fdc_intrq_w)) + MCFG_FLOPPY_DRIVE_ADD(FDC1797_TAG":0", vixen_floppies, "525dd", floppy_image_device::default_floppy_formats) + MCFG_FLOPPY_DRIVE_SOUND(true) + MCFG_FLOPPY_DRIVE_ADD(FDC1797_TAG":1", vixen_floppies, "525dd", floppy_image_device::default_floppy_formats) + MCFG_FLOPPY_DRIVE_SOUND(true) + MCFG_IEEE488_BUS_ADD() + MCFG_IEEE488_SRQ_CALLBACK(WRITELINE(vixen_state, srq_w)) + MCFG_IEEE488_ATN_CALLBACK(WRITELINE(vixen_state, atn_w)) + + /* software lists */ + MCFG_SOFTWARE_LIST_ADD("disk_list", "vixen") + + // internal ram + MCFG_RAM_ADD(RAM_TAG) + MCFG_RAM_DEFAULT_SIZE("64K") +MACHINE_CONFIG_END + + + +//************************************************************************** +// ROMS +//************************************************************************** + +//------------------------------------------------- +// ROM( vixen ) +//------------------------------------------------- + +ROM_START( vixen ) + ROM_REGION( 0x1000, Z8400A_TAG, 0 ) + ROM_LOAD( "osborne 4 mon rom v1.04 3p40082-03 a0a9.4c", 0x0000, 0x1000, CRC(5f1038ce) SHA1(e6809fac23650bbb4689e58edc768d917d80a2df) ) // OSBORNE 4 MON ROM / V1.04 3P40082-03 / A0A9 (c) OCC 1985 + + ROM_REGION( 0x1000, "video", 0 ) + ROM_LOAD( "v1.10.3j", 0x0000, 0x1000, CRC(1f93e2d7) SHA1(0c479bfd3ac8d9959c285c020d0096930a9c6867) ) + + ROM_REGION( 0x1000, "chargen", 0 ) + ROM_LOAD( "v1.00 l.1j", 0x0000, 0x1000, CRC(f97c50d9) SHA1(39f73afad68508c4b8a4d241c064f9978098d8f2) ) +ROM_END + + + +//************************************************************************** +// DRIVER INITIALIZATION +//************************************************************************** + +//------------------------------------------------- +// DRIVER_INIT( vixen ) +//------------------------------------------------- + + +DRIVER_INIT_MEMBER(vixen_state,vixen) +{ + m_program = &m_maincpu->space(AS_PROGRAM); +} + + + +//************************************************************************** +// SYSTEM DRIVERS +//************************************************************************** + +// YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS +COMP( 1984, vixen, 0, 0, vixen, vixen, vixen_state, vixen, "Osborne", "Vixen", 0 ) |