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Mystery solved!
After looking in the diagrams, I got a clue from seeing a listing for "Spare Gates," which I assumed were unused pins on IC chips. Pins 5 and 6 on UF 11 were listed as spare gates....

Ok, the jumper wire that was soldered in is connected between pin 6 on UF 7 and pin 6 on UF 11. I Remember that the other jumper wire that was clipped on was also connected on UF 7, but...

Thank you for finding that! Those diagrams should be helpful. It seems like the jumper wire I disconnected must be somehow related to the vertical sync. But I still just don't understand why anyone...

I just recently bought an Osborne Executive computer. It's in good condition, but someone has definitely messed with it at some point. It was working ok, but the front cover was a little loose and...

Thanks for the replies so far.

What's kind of throwing me off is the power supply. From what I've read, it's actually AC and is just a step-down transformer. BUT it uses 2 oddball voltages...16...

Hi,
I've gotten into collecting vintage computers, and I found a TI-99/4a for sale. However, it doesn't have the power supply or any of the cables and the seller says they have no way to test it and...

Hi,

I just recently bought a Tandy 200. It's a really cool little computer, but I'm having some problems with it and I was hoping someone might be able to help.

The "Text" word processing...

Bungo Pony, the code you posted works! At first, I was getting an "out of data" error message...and I've seen that happen sometimes if you press return after the "Ready" prompt without any other...

I'm still not having any luck :(

KC9UDX, I tried to use the code you posted. I wasn't sure how to get the second set of control characters after the RUN statement though (the ones with the dots)....

Thanks for the help so far.

KC9UDX, I am using a disk, like you said. I have a 1571 disk drive. I'll try the code you posted. I did some more digging online, and it turns out that you Poke...

I recently bought a VIC-20, and I've been trying to make some simple programs for it. But I'm already running into problems with the tiny 3.5 kb of available memory on the stock computer. I do...

Hi,
I just joined this website. I recently bought an Apple II+ computer, and a few days ago I got really lucky and found an ImageWriter II printer at a thrift shop. I need a Super Serial card so I...

Hi,
I just joined this website. I was actually about to post a topic about this. I had wondered too if there was a way to track elapsed time with an Apple II, since it doesn't come with a built-in...