VIA logs peripheral attach and shutdown.
pin_map_test with TestPinMapPinMask.
spi.NewSlave() stores PinMap correctly; with test.
Via6522.Read(0x2) fixed and tested; returns DDRB not DDRA.
via6522: TestViaReadAndWriteInputOutputPortRegisters.
via6522: TestViaReadAndWriteToNandPeripheral
via6522: peripheral pinmask is applied to Write() data.