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* 1100 0001 = a | * 1100 0001 = a | ||
* 1101 0010 = r | * 1101 0010 = r | ||
* 1110 | * 1110 0010 = read nibble from memory | ||
* 1110 | * 1110 0011 = write nibble to memory | ||
* 1110 | * 1110 0100 = add | ||
This isn't especially compact, but would seem to make it easy to separate different operations (e.g. to pass instructions to the memory unit). | This isn't especially compact, but would seem to make it easy to separate different operations (e.g. to pass instructions to the memory unit). | ||