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Limits sync counter size.

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This commit is contained in:
Thomas Harte 2017-08-26 12:31:19 -04:00
parent 039aed1bd1
commit 3caa4705ca
1 changed files with 2 additions and 2 deletions
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4
Components/6845/CRTC6845.hpp
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@ -80,7 +80,7 @@ template <class T> class CRTC6845 {
while(cyles_remaining--) {
// check for end of horizontal sync
if(bus_state_.hsync) {
hsync_counter_++;
hsync_counter_ = (hsync_counter_ + 1) & 15;
bus_state_.hsync = hsync_counter_ != (registers_[3] & 15);
}
@ -122,7 +122,7 @@ template <class T> class CRTC6845 {
inline void do_end_of_line() {
// check for end of vertical sync
if(bus_state_.vsync) {
vsync_counter_++;
vsync_counter_ = (vsync_counter_ + 1) & 15;
if(vsync_counter_ == (registers_[3] >> 4)) {
bus_state_.vsync = false;
}