Hallo Tod, > Yes, the Transactor had those articles and they were quite mind-bending > and informative. I have those Transactors, but they didn't discuss the > topic of FREEZING. I would like to know how this part is accomplished. > Maybe I need to dig deeper into these articles. I have once tried to copy a FC3 but stopped this project due to the fact that I got two others for free. What I remeber is this. Pushing the freeze button caused an interrupt but also took care of the fact that the C64 read the NMI-vectors out of the EPROM of the FC3 instead out of its own Kernal. This trick was done by ONLY negating the -GAME line. As your own PRG is now in control running in the extern EPROM, nothing can disturb the contents of RAM and most I/O registers. Groetjes, Ruud - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail email@example.com.
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