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I now believe only the 6522 is on the synchronous bus.

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Thomas Harte 2019-05-06 14:10:13 -04:00
parent b540f58457
commit a131d39451
1 changed files with 3 additions and 3 deletions
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6
Machines/Apple/Macintosh/Macintosh.cpp
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@ -76,9 +76,9 @@ class ConcreteMachine:
if(cycle.operation) {
auto word_address = cycle.word_address();
// Hardware devices begin at 0x800000 and accesses to 'them' (i.e. at lest the 6522,
// and the other two are a guess) is via the synchronous bus.
mc68000_.set_is_peripheral_address(word_address >= 0x400000);
// The 6522 is accessed via the synchronous bus.
mc68000_.set_is_peripheral_address((word_address & 0x7ff0ff) == 0x77f0ff);
if(word_address >= 0x400000) {
if(cycle.data_select_active()) {
// printf("IO access to %06x: ", word_address << 1);