A good real terminal

[Tony Duell]

> The two faults I remember with VT220 terminals were dead 9636/9737
> EIA chips, and loss of horizontal hold.  It was tough getting the
> old EIA chips out to mount sockets (must have had heavy copper
> inner layers on the mainboard PCB), but once that was done, those
> were easy to fix.  We only lost about one a year, anyway.  The
> video, I was never able to fix myself with what I knew then.  Perhaps
> I could fix it now.

I've had to repair a few VT220s with no horizontal hold. It seems to be 
due to bad contact at the horizontal hold preset. Pull the case, note the 
positon of this preset, and turn it from end to end a few times, finally 
putting it back to the original postion. Power up and most likely the 
picture will be locked. If it is, put the case back on. 

-tony