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Hacks in a lying vertical blank value.

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This commit is contained in:
Thomas Harte 2020-11-04 21:18:27 -05:00
parent 9e2a6526d1
commit 78b57e73d5
1 changed files with 5 additions and 3 deletions
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8
Machines/Apple/AppleIIgs/AppleIIgs.cpp
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@ -184,10 +184,12 @@ class ConcreteMachine:
case 0xc017: AuxiliaryRead(slot_C3_rom); break;
case 0xc018: VideoRead(get_80_store()); break;
// case 0xc019: VideoRead(get_is_vertical_blank(cycles_since_video_update_)); break;
case 0xc019:
case 0xc019: {
printf("TODO: vertical blank check\n");
*value = 0x80; // i.e. not VBL.
break;
static uint8_t vblank = 0x80;
*value = vblank;
vblank ^= 0x80;
} break;
case 0xc01a: VideoRead(get_text()); break;
case 0xc01b: VideoRead(get_mixed()); break;
case 0xc01c: VideoRead(get_page2()); break;