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Removes ROM mirroring above $600000.

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This commit is contained in:
Thomas Harte 2019-05-08 15:07:03 -04:00
parent 8293b18278
commit 0ad88508f7
1 changed files with 3 additions and 4 deletions
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7
Machines/Apple/Macintosh/Macintosh.cpp
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@ -165,8 +165,8 @@ class ConcreteMachine:
memory_base = rom_.data();
word_address %= rom_.size();
// Disallow writes to ROM.
if(!(operation & Microcycle::Read)) operation = 0;
// Disallow writes to ROM; also it doesn't mirror above 0x60000, ever.
if(!(operation & Microcycle::Read) || word_address >= 0x300000) operation = 0;
}
switch(operation & (Microcycle::SelectWord | Microcycle::SelectByte | Microcycle::Read | Microcycle::InterruptAcknowledge)) {
@ -286,14 +286,13 @@ class ConcreteMachine:
void set_control_line_output(Port port, Line line, bool value) {
/*
Keyboard wiring (I believe):
CB2 = data (output)
CB2 = data (input/output)
CB1 = clock (input)
CA2 is used for receiving RTC interrupts.
CA1 is used for receiving vsync maybe?
*/
if(port == Port::B && line == Line::Two) keyboard_.set_input(value);
// printf("6522 line %c%d: %c\n", port ? 'B' : 'A', int(line), value ? 't' : 'f');
}
private: