/* XL 80 cartridge (c) 1984 20 Data Corporation PCB Layout ---------- |==================================| | LS175 LS20 LS139 | | LS157 | |=======| | |=| RAM | |=| LS157 LS157 LS165 | |=| | |=| CN1| |=| CRTC ROM1 | |=| | |=| ROM0 LS245 LS151 | |=| 14.31818MHz| |=======| LS174 LS00 | | HCU04 | | LS74 LS161 LS74 | |==================================| Notes: All IC's shown. CRTC - Hitachi HD46505SP RAM - Toshiba TMM2016AP-12 2Kx8 Static RAM ROM0 - GI 9433CS-0090 8Kx8 ROM ROM1 - GI 9316CS-F67 2Kx8 ROM "DTC" CN1 - RCA video output */ #include "c64_xl80.h" //************************************************************************** // MACROS/CONSTANTS //************************************************************************** #define RAM_SIZE 0x800 #define HD46505SP_TAG "mc6845" #define MC6845_SCREEN_TAG "screen80" //************************************************************************** // DEVICE DEFINITIONS //************************************************************************** const device_type C64_XL80 = &device_creator; //------------------------------------------------- // ROM( c64_xl80 ) //------------------------------------------------- ROM_START( c64_xl80 ) ROM_REGION( 0x800, HD46505SP_TAG, 0 ) ROM_LOAD( "dtc.u14", 0x000, 0x800, CRC(9edf5e58) SHA1(4b244e6d94a7653a2e52c351589f0b469119fb04) ) ROM_END //------------------------------------------------- // rom_region - device-specific ROM region //------------------------------------------------- const rom_entry *c64_xl80_device::device_rom_region() const { return ROM_NAME( c64_xl80 ); } //------------------------------------------------- // mc6845_interface crtc_intf //------------------------------------------------- void c64_xl80_device::crtc_update_row(mc6845_device *device, bitmap_rgb32 &bitmap, const rectangle &cliprect, UINT16 ma, UINT8 ra, UINT16 y, UINT8 x_count, INT8 cursor_x, void *param) { for (int column = 0; column < x_count; column++) { UINT8 code = m_ram[((ma + column) & 0x7ff)]; UINT16 addr = (code << 3) | (ra & 0x07); UINT8 data = m_char_rom->base()[addr & 0x7ff]; if (column == cursor_x) { data = 0xff; } for (int bit = 0; bit < 8; bit++) { int x = (column * 8) + bit; int color = BIT(data, 7); bitmap.pix32(y, x) = RGB_MONOCHROME_WHITE[color]; data <<= 1; } } } static MC6845_UPDATE_ROW( c64_xl80_update_row ) { c64_xl80_device *xl80 = downcast(device->owner()); xl80->crtc_update_row(device,bitmap,cliprect,ma,ra,y,x_count,cursor_x,param); } static MC6845_INTERFACE( crtc_intf ) { MC6845_SCREEN_TAG, false, 8, NULL, c64_xl80_update_row, NULL, DEVCB_NULL, DEVCB_NULL, DEVCB_NULL, DEVCB_NULL, NULL }; //------------------------------------------------- // GFXDECODE( c64_xl80 ) //------------------------------------------------- static GFXDECODE_START( c64_xl80 ) GFXDECODE_ENTRY(HD46505SP_TAG, 0x0000, gfx_8x8x1, 0, 1) GFXDECODE_END //------------------------------------------------- // MACHINE_CONFIG_FRAGMENT( c64_xl80 ) //------------------------------------------------- static MACHINE_CONFIG_FRAGMENT( c64_xl80 ) MCFG_SCREEN_ADD(MC6845_SCREEN_TAG, RASTER) MCFG_SCREEN_UPDATE_DEVICE(HD46505SP_TAG, h46505_device, screen_update) MCFG_SCREEN_SIZE(80*8, 24*8) MCFG_SCREEN_VISIBLE_AREA(0, 80*8-1, 0, 24*8-1) MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500)) MCFG_SCREEN_REFRESH_RATE(50) //MCFG_GFXDECODE(c64_xl80) MCFG_MC6845_ADD(HD46505SP_TAG, H46505, XTAL_14_31818MHz, crtc_intf) MACHINE_CONFIG_END //------------------------------------------------- // machine_config_additions - device-specific // machine configurations //------------------------------------------------- machine_config_constructor c64_xl80_device::device_mconfig_additions() const { return MACHINE_CONFIG_NAME( c64_xl80 ); } //************************************************************************** // LIVE DEVICE //************************************************************************** //------------------------------------------------- // c64_xl80_device - constructor //------------------------------------------------- c64_xl80_device::c64_xl80_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : device_t(mconfig, C64_XL80, "XL 80", tag, owner, clock, "c64_xl80", __FILE__), device_c64_expansion_card_interface(mconfig, *this), m_crtc(*this, HD46505SP_TAG), m_char_rom(*this, HD46505SP_TAG) { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void c64_xl80_device::device_start() { // allocate memory c64_ram_pointer(machine(), RAM_SIZE); // state saving save_pointer(NAME(m_ram), RAM_SIZE); } //------------------------------------------------- // device_reset - device-specific reset //------------------------------------------------- void c64_xl80_device::device_reset() { } //------------------------------------------------- // c64_cd_r - cartridge data read //------------------------------------------------- UINT8 c64_xl80_device::c64_cd_r(address_space &space, offs_t offset, UINT8 data, int sphi2, int ba, int roml, int romh, int io1, int io2) { if (!io2 && BIT(offset, 2)) { if (offset & 0x01) { data = m_crtc->register_r(space, 0); } } else if (offset >= 0x8000 && offset < 0x9000) { data = m_roml[offset & 0xfff]; } else if (offset >= 0x9800 && offset < 0xa000) { data = m_ram[offset & 0x7ff]; } return data; } //------------------------------------------------- // c64_cd_w - cartridge data write //------------------------------------------------- void c64_xl80_device::c64_cd_w(address_space &space, offs_t offset, UINT8 data, int sphi2, int ba, int roml, int romh, int io1, int io2) { if (offset >= 0x9800 && offset < 0xa000) { m_ram[offset & 0x7ff] = data; } else if (!io2 && BIT(offset, 2)) { if (offset & 0x01) { m_crtc->register_w(space, 0, data); } else { m_crtc->address_w(space, 0, data); } } }