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If you have a tv with composite in I would try using that and cut out the rf modulator , one less thing to worry about Yes! We got a little more success! The video is still scrambled, but in a WHOLE new way. It appears to be trying to display the start-up characters, but they don't make any sense. ...

As Nama mentioned, a multimeter and logic probe are very useful. If you can beg or borrow any kind of oscilloscope, it can sometimes be the difference between a fix and a perpetual "to do" item. I actually DO have access to an oscilloscope. I also have a multimeter and a logic probe, so I'm pretty ...

Hello! I recently picked up a Challenger 4P that could use a little help, and unfortunately I am a noob when it comes to Ohio Scientific, or...really just all vintage computing in general. It's in a little rough of shape, scratches, paint chipping, etc, etc, but that's not the main problem. Whenever...