On Fri, May 17, 2019 at 08:43:13PM -0500, Jim Brain wrote: >Given Pete's response about putting a JD ROM in and the thing refusing >to work, does anyone on list have the drive and would be willing to >test? Could it be that some address or data lines have been swapped on the circuit board? In that case, you would have to transform the EPROM image accordingly. It should be rather easy to figure out the mapping by examining the raw image of the original ROM. It is an interesting idea that permuting some instructions would thwart copyright claims. I wonder if that would really have held up in court. Even back in that day, there had been some disputes, such as one between Commodore and Bally Midway, regarding Radar Rat Race aka Vic Rat Race aka Rally-X. MarkoReceived on 2020-05-29 22:04:16
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