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Corrects internal cycle contention.

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Thomas Harte 2021-04-15 19:17:11 -04:00
parent d1bb3aada4
commit 71cf63bd35
2 changed files with 2 additions and 9 deletions
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10
Machines/Sinclair/ZXSpectrum/Video.hpp
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@ -122,13 +122,9 @@ template <VideoTiming timing> class Video {
.cycles_per_line = 228 * 2,
.lines_per_frame = 311,
// i.e. video fetching begins five cycles after the start of the
// contended memory pattern below; that should put a clear two
// cycles between a Z80 access and the first video fetch.
.contention_leadin = 5 * 2,
.contention_duration = 128 * 2,
// i.e. interrupt is first signalled 14368 cycles before the first video fetch.
.interrupt_time = (228*311 - 14361) * 2,
.delays = {
@ -151,14 +147,10 @@ template <VideoTiming timing> class Video {
.cycles_per_line = 224 * 2,
.lines_per_frame = 312,
// i.e. video fetching begins five cycles after the start of the
// contended memory pattern below; that should put a clear two
// cycles between a Z80 access and the first video fetch.
.contention_leadin = 5 * 2,
.contention_duration = 128 * 2,
// i.e. interrupt is first signalled 14368 cycles before the first video fetch.
.interrupt_time = (224*312 - 14361) * 2,
.interrupt_time = (224*312 - 14330) * 2,
.delays = {
12, 11,

1
Machines/Sinclair/ZXSpectrum/ZXSpectrum.cpp
View File

@ -281,6 +281,7 @@ template<Model model> class ConcreteMachine:
time += next_delay + 2;
}
advance(cycle.length + delay);
return delay;
}
}