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Old 12th Jun 2022, 10:57 am   #64
SiriusHardware
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Join Date: Aug 2011
Location: Newcastle, Tyne and Wear, UK.
Posts: 11,556
Default Re: Just got myself a commodore pet setup but not working

Ref: The most recent waveform captures, horiz drive and video in the images in #62 look good - we can see that the video output is mostly low with very thin vertical spikes as expected, and Pud's video shows vert drive to be OK too, it's just that the scope is not triggering and holding the trace steady - but we can still see there is a valid waveform there so all good, which still leads us in the direction that the computer is OK but the monitor is not.

Pud could try Colin's suggestion earlier, enter that short line of BASIC (Followed by enter) and see if the computer generates a sound, as it should. That would further reinforce the idea that the computer is actually working.

You may also be able to do the same thing by pressing/releasing CTRL and G together although the machine might have to have CAPS-LOCK on for that to work. However, that's only an educated guess on my part, so if pressing CTRL-G makes the machine beep or bing, great, but don't worry if it does not.
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