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Add IO access to the 6522s.

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Thomas Harte
2025-09-15 21:26:36 -04:00
parent 95f57f4eeb
commit dcf9de1a01
1 changed files with 15 additions and 12 deletions
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Machines/Acorn/BBCMicro/BBCMicro.cpp
+15 -12
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@@ -121,18 +121,21 @@ public:
// Check for an IO access; if found then perform that and exit.
//
if(address >= 0xfc00 && address < 0xff00) {
// TODO:
//
// fe00 - CRTC select register/read from status.
// fe01 - CRTC write/read register.
// (mirrored up to fe08)
//
// fe08 - 6850 read/write.
// (mirrored up to fe10)
//
Logger::error().append("Unhandled IO access at %04x", address);
if(address >= 0xfe40 && address < 0xfe60) {
if(is_read(operation)) {
*value = system_via_.read(address);
} else {
system_via_.write(address, *value);
}
} else if(address >= 0xfe60 && address < 0xfe80) {
if(is_read(operation)) {
*value = user_via_.read(address);
} else {
user_via_.write(address, *value);
}
} else {
Logger::error().append("Unhandled IO access at %04x", address);
}
return duration;
}