Reviving VT220?

Tony Duell ard.p850ug1 at
Sat Apr 29 10:22:45 CDT 2017

On Sat, Apr 29, 2017 at 4:19 PM, Aaron Jackson <aaron at> wrote:
> Seems to be working fine as a terminal hooked up to the TV which is good
> news. I am sure you are correct about me having made a measurement error
> there...

So the logic side is working. The problem is very likely to be in the
monitor circuit,
page 16 of the schematics.

What test gear do you have? Do you have a 'scope, for example?

Can you get anying on the screen if you adjust the brightness preset?


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