Re: PCE error attempting to run copy protected floppy image: E8272: CMD=71 D=? INVALID
Posted on Yesterday, 23:29
If we use the command mask 1F, 71 & 1F = 11. 11 is not a valid command that I am aware of. Programming the FDC involves writing several bytes in succession for the operands of different commands. If an earlier command was valid but not implemented and its operands ignored, then its possible that …