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Corrects graphics 'carry' — the potential holdover into delayed bytes.

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This commit is contained in:
Thomas Harte 2018-04-26 19:26:43 -04:00
parent 244721a6f8
commit 850a394eb5
1 changed files with 3 additions and 2 deletions
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5
Machines/AppleII/Video.hpp
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@ -103,6 +103,7 @@ template <class BusHandler> class Video: public VideoBase {
if(row_ < 192) {
if(!column_) {
pixel_pointer_ = reinterpret_cast<uint16_t *>(crt_->allocate_write_area(80, 2));
graphics_carry_ = 0;
}
const int pixel_end = std::min(40, ending_column);
@ -143,9 +144,9 @@ template <class BusHandler> class Video: public VideoBase {
const uint8_t graphic = bus_handler_.perform_read(static_cast<uint16_t>(graphics_address + c));
pixel_pointer_[c] = scaled_byte[graphic];
if(graphic & 0x80) {
reinterpret_cast<uint8_t *>(&pixel_pointer_[c])[0] |= graphics_carry_ << 7;
reinterpret_cast<uint8_t *>(&pixel_pointer_[c])[0] |= graphics_carry_;
}
graphics_carry_ = pixel_pointer_[c] & 1;
graphics_carry_ = (graphic >> 6) & 1;
}
break;
}