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Case Studies

Self-Propagation Monsters

Z-80 Bug I discovered a real “bug” in the Z-80. Back in 1975, I was staring at a PDP-11 programming card late one night, (I have dozens of old programming cards from various CPUs) and noticed there is no documented addressing mode for 47, which is -@PC, or -(PC). They thought it was useless. It […]