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Fixes announced timing difference between pixel and border lines.

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The Apple II sync fault is now fixed!
This commit is contained in:
Thomas Harte 2019-02-12 22:32:02 -05:00
parent 77bebd4a65
commit 7939897622
1 changed files with 11 additions and 5 deletions
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16
Machines/AppleII/Video.hpp
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@ -346,8 +346,9 @@ template <class BusHandler, bool is_iie> class Video: public VideoBase {
while(int_cycles) {
const int cycles_this_line = std::min(65 - column_, int_cycles);
const int ending_column = column_ + cycles_this_line;
const bool is_vertical_sync_line = (row_ >= first_sync_line && row_ < first_sync_line + 3);
if(row_ >= first_sync_line && row_ < first_sync_line + 3) {
if(is_vertical_sync_line) {
// In effect apply an XOR to HSYNC and VSYNC flags in order to include equalising
// pulses (and hencce keep hsync approximately where it should be during vsync).
const int blank_start = std::max(first_sync_column - sync_length, column_);
@ -361,7 +362,7 @@ template <class BusHandler, bool is_iie> class Video: public VideoBase {
crt_.output_sync((ending_column - blank_end) * 14);
}
} else {
crt_.output_sync((cycles_this_line) * 14);
crt_.output_sync(cycles_this_line * 14);
}
} else {
const GraphicsMode line_mode = graphics_mode(row_);
@ -521,7 +522,7 @@ template <class BusHandler, bool is_iie> class Video: public VideoBase {
*/
if(column_ < first_sync_column && ending_column >= first_sync_column) {
crt_.output_blank((first_sync_column - 41)*14 - 1);
crt_.output_blank(first_sync_column*14 - 568);
}
if(column_ < (first_sync_column + sync_length) && ending_column >= (first_sync_column + sync_length)) {
@ -556,8 +557,13 @@ template <class BusHandler, bool is_iie> class Video: public VideoBase {
}
// Add an extra half a colour cycle of blank; this isn't counted in the run_for
// count explicitly but is promised.
crt_.output_blank(2);
// count explicitly but is promised. If this is a vertical sync line, output sync
// instead of blank, taking that to be the default level.
if(is_vertical_sync_line) {
crt_.output_sync(2);
} else {
crt_.output_blank(2);
}
}
}
}