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Fix Apple II/II+/IIe first eight non-hbl vbl bytes

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Closes #1196
This commit is contained in:
Ryan Carsten Schmidt 2023-11-13 00:50:13 -06:00
parent 03a2d4df80
commit 234292f163
1 changed files with 6 additions and 6 deletions
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12
Machines/Apple/AppleII/Video.hpp
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@ -215,16 +215,16 @@ template <class BusHandler, bool is_iie> class Video: public VideoBase {
// Calculate the address.
uint16_t read_address = uint16_t(get_row_address(mapped_row) + mapped_column - 25);
if(hbl) {
// Wraparound addressing within 128 byte sections.
if(mapped_row < 64) {
read_address += 128;
}
// Wraparound addressing within 128 byte sections.
if(mapped_row < 64 && mapped_column < 25) {
read_address += 128;
}
if(hbl && !is_iie_) {
// On Apple II and II+ (not IIe or later) in text/lores mode (not hires), horizontal
// blanking bytes read from $1000 higher.
const GraphicsMode pixel_mode = graphics_mode(mapped_row);
if(!is_iie_ && ((pixel_mode == GraphicsMode::Text) || (pixel_mode == GraphicsMode::LowRes))) {
if((pixel_mode == GraphicsMode::Text) || (pixel_mode == GraphicsMode::LowRes)) {
read_address += 0x1000;
}
}