Hi Andrew, Thanks for the info. This does confirm what I'd heard recently. My 64 does indeed have the older 5 pin din style video connector instead of 8. Now I just gotta find that old article I mentioned. I guess I should try Kevin Savetz's site, used to be the antic archive exclusively until he added some commodore stuff as well. > > This information, copied from the portcommodore.com website, may be helpful: > > MY COMMODORE 64 CP/M CARTRIDGE DOESN'T WORK > > * Commodore's CP/M cartridge for the 64 relies on precise timing of the 64 > when Commodore did revisions to later 64s that timing was altered. Only > early model 64s have the compatible timing to support the CP/M cartridge. > A good sign you have an early 64 is if the video connector has ony 5 > pins instead of the 8 in the later 64s. > >