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Cpu.Shutdown() doesn't call method on nil monitor.
Via6522 handles read from port with mixed DDR.
BRK temporarily used for debug to dump CPU state to console.
WIP: SD card emulation.
WIP: SD card; ParallelPeripheral interface updated.
WIP: SD card; queueMiso(), one-line stdout per byte exchanged.
sd: extracting sdState from sd.go
sd: sd_spi.go extracted from sd.go.
spi package and spi.Slave{} extracted from sd.