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Log just enough to see that this looks like an SN76489 write.

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This commit is contained in:
Thomas Harte
2025-09-15 22:03:37 -04:00
parent dcf9de1a01
commit 81f2952c97
1 changed files with 43 additions and 2 deletions
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45
Machines/Acorn/BBCMicro/BBCMicro.cpp
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@@ -24,11 +24,54 @@
namespace BBCMicro {
namespace {
using Logger = Log::Logger<Log::Source::BBCMicro>;
struct UserVIAPortHandler: public MOS::MOS6522::IRQDelegatePortHandler {
};
struct SystemVIAPortHandler: public MOS::MOS6522::IRQDelegatePortHandler {
// CA2: key pressed;
// CA1: vertical sync;
// CB2: lightpen strobe offscreen;
// CB1: ADC conversion complete.
template <MOS::MOS6522::Port port>
void set_port_output(const uint8_t value, uint8_t) {
if(port == MOS::MOS6522::Port::A) {
Logger::info().append("Port A write: %02x", value);
return;
}
// The addressable latch.
//
// B0: enable writes to the sound generator;
// B1, B2: read/write to the sound processor;
// B3: enable writes to the keyboard.
const auto mask = uint8_t(1 << (value & 7));
latch_ = (latch_ & ~mask) | ((value & 8) ? mask : 0);
Logger::info().append("Programmable latch: %d%d%d%d", bool(latch_ & 8), bool(latch_ & 4), bool(latch_ & 2), bool(latch_ & 1));
}
template <MOS::MOS6522::Port port>
uint8_t get_port_input() const {
if(port == MOS::MOS6522::Port::B) {
// TODO:
//
// b4/5: joystick fire buttons;
// b6/7: speech interrupt/ready inputs.
Logger::info().append("Port B read");
return 0xff;
}
Logger::info().append("Port A read");
return 0xff;
}
private:
uint8_t latch_ = 0;
uint8_t port_a_output_ = 0;
};
}
@@ -154,8 +197,6 @@ public:
}
private:
using Logger = Log::Logger<Log::Source::BBCMicro>;
// MARK: - ScanProducer.
void set_scan_target(Outputs::Display::ScanTarget *) override {}
Outputs::Display::ScanStatus get_scan_status() const override {