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Reduces frequency of update_video() calls.

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This commit is contained in:
Thomas Harte 2019-07-25 10:14:52 -04:00
parent 5769944918
commit 1672dc5946
1 changed files with 8 additions and 1 deletions
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9
Machines/Apple/Macintosh/Macintosh.cpp
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@ -313,7 +313,14 @@ template <Analyser::Static::Macintosh::Target::Model model> class ConcreteMachin
) {
memory_base = ram_;
word_address &= ram_mask_;
update_video();
// This is coupled with the Macintosh implementation of video; the magic
// constant should probably be factored into the Video class.
// It embodies knowledge of the fact that video (and audio) will always
// be fetched from the final $d900 bytes (i.e. $6c80 words) of memory.
// (And that ram_mask_ = ram size - 1).
if(word_address > ram_mask_ - 0x6c80)
update_video();
} else {
memory_base = rom_;
word_address &= rom_mask_;