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-rw-r--r--src/mess/video/pet.c113
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 )
+{
+}
+