diff options
Diffstat (limited to 'src/mess/machine/c64/xl80.c')
-rw-r--r-- | src/mess/machine/c64/xl80.c | 255 |
1 files changed, 255 insertions, 0 deletions
diff --git a/src/mess/machine/c64/xl80.c b/src/mess/machine/c64/xl80.c new file mode 100644 index 00000000000..488a8f8169a --- /dev/null +++ b/src/mess/machine/c64/xl80.c @@ -0,0 +1,255 @@ +/* + +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 "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<c64_xl80_device>; + + +//------------------------------------------------- +// 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<c64_xl80_device *>(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); + } + } +} |