It’s the kind with the “Fat 40” universal 40/80-column motherboard. There is a fellow on one of the PET sites who sells new-old-stock official Commodore-branded 64K RAM upgrades that will work on this model, but they appear to preclude other modifications within the case due to being physically enormous. (I am particularly taken with the idea of the internal IDE modification I’ve heard rumours of, but there are others possible.) Also, I’m not at all sure I could afford to pay for such a beast; with shipping and so on, they are quite expensive by my standards.
Does anyone have any pointers to documentation on using the 100 expansion header pins at the back right of the motherboard? I know from the 8296 documents I’ve examined that 50 of them are just ground-plane pairs, but I lack detailed explanation (and reliable identification) of the 50 actual signal pins. I haven’t even seen a reliable indication of what kind of female connector you would use to plug onto the two 50-pin headers!
Hoping someone’s gone this route before me,