This is an old post, preserved for reference.
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Following on from Part 1 of my Commodore PET Project, which looked at the history of this particular Commodore Pet 4032, the question is 'What are you going to do with it now?'. Well, I expect the biggest problem is going to be driving the display, so I concentrated on that first. The Arduino 80x25 TV out library I recently published was a starting point, but that was designed to output standard PAL / NTSC video signals. That is vertical sync of 50 or 60 Hz, and a horizontal sync of 15.625 KHz. The dot clock (the rate the pixels are sent out) is around 16MHz.
80x25 text out testing, and it was a basic computer, albeit with 1K free memory. Now, it was possible to type in a program an run it, again for the first time in many years.
Add something more powerful and you've got a usable computer. In the next article, I'll be doing just that.
Update: This PET has now been fully restored