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Slightly tweaks Master System timing numbers.

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This commit is contained in:
Thomas Harte 2018-10-21 13:58:34 -04:00
parent a38974ef2e
commit 16f08eb654
1 changed files with 2 additions and 2 deletions
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4
Components/9918/9918.cpp
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@ -66,7 +66,7 @@ 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 = 64;
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;
@ -564,7 +564,7 @@ void TMS9918::set_register(int address, uint8_t value) {
uint8_t TMS9918::get_current_line() { uint8_t TMS9918::get_current_line() {
// Determine the row to return. // Determine the row to return.
static const int row_change_position = 62; // This is the proper Master System value; substitute if any other VDPs turn out to have this functionality. static const int row_change_position = 63; // This is the proper Master System value; substitute if any other VDPs turn out to have this functionality.
int source_row = int source_row =
(write_pointer_.column < row_change_position) (write_pointer_.column < row_change_position)
? (write_pointer_.row + mode_timing_.total_lines - 1)%mode_timing_.total_lines ? (write_pointer_.row + mode_timing_.total_lines - 1)%mode_timing_.total_lines