diff options
Diffstat (limited to 'src/mess/video/pet.c')
-rw-r--r-- | src/mess/video/pet.c | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/src/mess/video/pet.c b/src/mess/video/pet.c new file mode 100644 index 00000000000..5e10b5be2a2 --- /dev/null +++ b/src/mess/video/pet.c @@ -0,0 +1,113 @@ +/*************************************************************************** + + commodore pet discrete video circuit + + PeT mess@utanet.at + +***************************************************************************/ + +#include "emu.h" +#include "includes/pet.h" + + +void pet_vh_init (running_machine &machine) +{ + UINT8 *gfx = machine.root_device().memregion("gfx1")->base(); + int i; + + /* inversion logic on board */ + for (i = 0; i < 0x400; i++) + { + gfx[0x800+i] = gfx[0x400+i]; + gfx[0x400+i] = gfx[i]^0xff; + gfx[0xc00+i] = gfx[0x800+i]^0xff; + } +} + +void pet80_vh_init (running_machine &machine) +{ + UINT8 *gfx = machine.root_device().memregion("gfx1")->base(); + int i; + + /* inversion logic on board */ + for (i = 0; i < 0x400; i++) { + gfx[0x800+i] = gfx[0x400+i]; + gfx[0x400+i] = gfx[i]^0xff; + gfx[0x0c00+i] = gfx[0x800+i]^0xff; + } + // I assume the hardware logic is not displaying line 8 and 9 of char + // I draw it like lines would be 8-15 are black! + for (i=511; i>=0; i--) { + memcpy(gfx+i*16, gfx+i*8, 8); + memset(gfx+i*16+8, 0, 8); + } +} + +void superpet_vh_init (running_machine &machine) +{ + UINT8 *gfx = machine.root_device().memregion("gfx1")->base(); + int i; + + for (i=0; i<0x400; i++) { + gfx[0x1000+i]=gfx[0x800+i]; + gfx[0x1800+i]=gfx[0xc00+i]; + gfx[0x1c00+i]=gfx[0x1800+i]^0xff; + gfx[0x1400+i]=gfx[0x1000+i]^0xff; + gfx[0x800+i]=gfx[0x400+i]; + gfx[0xc00+i]=gfx[0x800+i]^0xff; + gfx[0x400+i]=gfx[i]^0xff; + } + // I assume the hardware logic is not displaying line 8 and 9 of char + // I draw it like lines 8-15 are black! + for (i=1023; i>=0; i--) { + memcpy(gfx+i*16, gfx+i*8, 8); + memset(gfx+i*16+8, 0, 8); + } +} + +// commodore pet discrete video circuit +SCREEN_UPDATE_IND16( pet ) +{ + pet_state *state = screen.machine().driver_data<pet_state>(); + UINT8 *videoram = state->m_videoram; + int x, y, i; + + for (y=0, i=0; y<25;y++) + { + for (x=0;x<40;x++, i++) + { + drawgfx_opaque(bitmap, cliprect,screen.machine().gfx[state->m_font], + videoram[i], 0, 0, 0, 8*x,8*y); + } + } + return 0; +} + + +MC6845_UPDATE_ROW( pet40_update_row ) +{ + pet_state *state = device->machine().driver_data<pet_state>(); + UINT8 *videoram = state->m_videoram; + int i; + + for( i = 0; i < x_count; i++ ) { + drawgfx_opaque( bitmap, cliprect, device->machine().gfx[state->m_font], videoram[(ma+i)&0x3ff], 0, 0, 0, 8 * i, y-ra ); + } +} + +MC6845_UPDATE_ROW( pet80_update_row ) +{ + pet_state *state = device->machine().driver_data<pet_state>(); + UINT8 *videoram = state->m_videoram; + int i; + + for( i = 0; i < x_count; i++ ) { + drawgfx_opaque( bitmap, cliprect, device->machine().gfx[state->m_font], videoram[((ma+i)<<1)&0x7ff], 0, 0, 0, 16 * i, y-ra ); + drawgfx_opaque( bitmap, cliprect, device->machine().gfx[state->m_font], videoram[(((ma+i)<<1)+1)&0x7ff], 0, 0, 0, 16 * i + 8, y-ra ); + } +} + +WRITE_LINE_DEVICE_HANDLER( pet_display_enable_changed ) +{ +} + |