>Maybe 0x01 was the "intentional" halt instruction. 00 would be "increment A", 01 "decrement A". I would guess these weren't supported because of how that regi

>Maybe 0x01 was the "intentional" halt instruction. 00 would be "increment A", 01 "decrement A". I would guess these weren't supported because of how that register is connected to the ALU? FF = "load memory from memory", same as the HLT on the 8080.