Greetings, OpenBSD/macppc does not complete early boot on mac99: OpenPIC can reassert an interrupt still masked by CTPR; the edge triggered decrementer does not raise on zero; successful CUDA ADB replies omit the original command; and the fixed CUDA shift register delay can stretch packet delivery past the guest timeout on hosts with coarse timers.
This series corrects these four behaviours and adds a functional test which boots the official OpenBSD 7.9 macppc CD to the installer prompt.
