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Ensures unmapped peripherals return a consistent value.

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This commit is contained in:
Thomas Harte 2019-05-06 21:32:10 -04:00
parent d8ed8b66f3
commit 9bf9b9ea8c
1 changed files with 13 additions and 8 deletions
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21
Machines/Apple/Macintosh/Macintosh.cpp
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@ -106,11 +106,16 @@ class ConcreteMachine:
} else {
iwm_.write(register_address, cycle.value->halves.low);
}
printf("IWM %d %c [%02x]\n", register_address & 0xf, (cycle.operation & Microcycle::Read) ? 'r' : 'w', cycle.value->halves.low);
// printf("IWM %d %c [%02x]\n", register_address & 0xf, (cycle.operation & Microcycle::Read) ? 'r' : 'w', cycle.value->halves.low);
break;
default:
if(cycle.operation & Microcycle::Read) {
cycle.value->halves.low = 0xff;
if(cycle.operation & Microcycle::SelectWord) cycle.value->halves.high = 0xff;
}
break;
}
// printf("\n");
}
} else {
if(cycle.data_select_active()) {
@ -217,7 +222,7 @@ class ConcreteMachine:
b3: 0 = use alternate sound buffer, 1 = use ordinary sound buffer
b2–b0: audio output volume
*/
printf("6522 A: %02x\n", value);
// printf("6522 A: %02x\n", value);
machine_.set_rom_is_overlay(!!(value & 0x10));
machine_.set_use_alternate_screen_buffer(!(value & 0x40));
break;
@ -234,7 +239,7 @@ class ConcreteMachine:
b1: clock's data-clock line
b0: clock's serial data line
*/
printf("6522 B: %02x\n", value);
// printf("6522 B: %02x\n", value);
break;
}
}
@ -242,17 +247,17 @@ class ConcreteMachine:
uint8_t get_port_input(Port port) {
switch(port) {
case Port::A:
printf("6522 r A\n");
// printf("6522 r A\n");
return 0xff;
case Port::B:
printf("6522 r B\n");
// printf("6522 r B\n");
return 0x00;
}
}
void set_control_line_output(Port port, Line line, bool value) {
printf("6522 line %c%d: %c\n", port ? 'B' : 'A', int(line), value ? 't' : 'f');
// printf("6522 line %c%d: %c\n", port ? 'B' : 'A', int(line), value ? 't' : 'f');
}
private: