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Eliminates faulty attempt to satisfy SMSVDP vertical counter test.

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This commit is contained in:
Thomas Harte 2018-10-12 18:57:07 -04:00
parent f6af6778ab
commit 9ab0c54426
1 changed files with 2 additions and 1 deletions
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Components/9918/9918.cpp
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@ -64,6 +64,7 @@ Base::Base(Personality p) :
if(is_sega_vdp(personality_)) { if(is_sega_vdp(personality_)) {
mode_timing_.line_interrupt_position = 65; mode_timing_.line_interrupt_position = 65;
mode_timing_.end_of_frame_interrupt_position.column = 63; mode_timing_.end_of_frame_interrupt_position.column = 63;
mode_timing_.end_of_frame_interrupt_position.row = 193; mode_timing_.end_of_frame_interrupt_position.row = 193;
} }
@ -324,7 +325,7 @@ void TMS9918::run_for(const HalfCycles cycles) {
// it is reloaded either when it overflows or upon every non-pixel line after the first. // it is reloaded either when it overflows or upon every non-pixel line after the first.
// It is otherwise decremented. // It is otherwise decremented.
if(is_sega_vdp(personality_)) { if(is_sega_vdp(personality_)) {
if(row_ >= mode_timing_.total_lines-1 && row_ <= mode_timing_.pixel_lines) { if(row_ >= 0 && row_ <= mode_timing_.pixel_lines) {
--line_interrupt_counter; --line_interrupt_counter;
if(line_interrupt_counter == 0xff) { if(line_interrupt_counter == 0xff) {
line_interrupt_pending_ = true; line_interrupt_pending_ = true;