6502 Illegal Opcodes in the Siemens PC 100 Assembly Manual (1980)

The 6502 s illegal opcodes were of intense interest to home computer enthusiasts, and analyses were published in various magazines. But one would have never expected a company like Siemens to document illegal opcodes in a programming manual from 1980. The PC 100 Assembly Manual The Siemens PC 100 is basically a Rockwell AIM-65 single-board computer ... Read more