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Thank you for this information, that makes perfect sense. I was getting told I had put the cable in backwards, which would have been extremely awkward. This is more likely since I wasn't paying close attention to getting it in exact alignment and had it over a pair of pins! I'll order a...

New to Apple II Plus and think I screwed it up big time. I bought an Apple II Plus system at an estate sale and it has a u-Sci (Microsci ?) drive as drive 1 and an Apple Disk II as drive 2. I couldn't get the u-Sci to boot any disk. I have verified from another person with a working Disk II...

Excellent finds, thanks. Looks like it is a very specific ROM burned into a generic TMS1100 depending on the device? Cool.

Who here remembers the Science Fair Microcomputer Trainer? Most of these appear to have shipped with a TI TMS1100 CPU. Mine however has what is labelled as a Texas Instruments MP1312. Does anyone know where to find a datasheet for this IC? In the manual I have in the parts list, it shows the...