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Imposed counter size limits.

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Thomas Harte
2017-08-10 14:58:24 -04:00
parent cf810d8357
commit a1e2646301
1 changed files with 3 additions and 2 deletions
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5
Components/6845/CRTC6845.hpp
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@@ -104,7 +104,7 @@ template <class T> class CRTC6845 {
bus_state_.row_address = 0; bus_state_.row_address = 0;
bool is_at_end_of_frame = line_counter_ == registers_[4]; bool is_at_end_of_frame = line_counter_ == registers_[4];
line_counter_++; line_counter_ = (line_counter_ + 1) & 0x7f;
// check for end of visible lines // check for end of visible lines
if(line_counter_ == registers_[6]) { if(line_counter_ == registers_[6]) {
@@ -131,7 +131,7 @@ template <class T> class CRTC6845 {
line_counter_ = 0; line_counter_ = 0;
} }
} else { } else {
bus_state_.row_address++; bus_state_.row_address = (bus_state_.row_address + 1) & 0x1f;
} }
bus_state_.refresh_address = line_address_; bus_state_.refresh_address = line_address_;
} }
@@ -141,6 +141,7 @@ template <class T> class CRTC6845 {
} }
bus_state_.display_enable = character_is_visible_ && line_is_visible_; bus_state_.display_enable = character_is_visible_ && line_is_visible_;
bus_state_.refresh_address &= 0x3fff;
bus_handler_.perform_bus_cycle(bus_state_); bus_handler_.perform_bus_cycle(bus_state_);
} }
} }