UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Non-working Commodore PET 3016

SiriusHardware · 26th Feb 2021, 7:52 pm

Yes, the ability to 'pan' left and right can be useful.

I'm going to let Mark go with this for a while so you don't get conflicting instructions sending you in two directions at once.

In the meantime a little exercise for you:

Taking your screen shot in #680,

Can you say, roughly...

How many milliseconds there are between the falling edge of the first _CE pulse and the falling edge of the second _CE pulse?

How long (In milliseconds) is one _CE pulse?

Assuming the low edges of the _CE pulses are at 0V, what voltage is the _CE line at when it is NOT low?

(With the scope settings as they were, each horizontal division is 50mS: Each vertical division is 2V).

26th Feb 2021, 7:52 pm	#686
SiriusHardware Dekatron Join Date: Aug 2011 Location: Newcastle, Tyne and Wear, UK. Posts: 11,548	Re: Non-working Commodore PET 3016 Yes, the ability to 'pan' left and right can be useful. I'm going to let Mark go with this for a while so you don't get conflicting instructions sending you in two directions at once. In the meantime a little exercise for you: Taking your screen shot in #680, Can you say, roughly... How many milliseconds there are between the falling edge of the first _CE pulse and the falling edge of the second _CE pulse? How long (In milliseconds) is one _CE pulse? Assuming the low edges of the _CE pulses are at 0V, what voltage is the _CE line at when it is NOT low? (With the scope settings as they were, each horizontal division is 50mS: Each vertical division is 2V). Last edited by SiriusHardware; 26th Feb 2021 at 7:57 pm.