Comment on Question about driving some 80's CRTs
AbidingOhmsLaw@lemmy.ml 2 weeks ago
The service manual says they were made for an F55 video terminal. 1980s video terminals had video driver boards in them to con vert the TTY signals to video. That driver boards varied wildly on the output signals, some would output composite video leaving the monitor to control the raster scan, sync, horizontal & vertical sweeps but some would output all of that and there would be minimal circuits in the monitor cage. Hopefully you have ones tharpt take composite video. can you get pictures of the back and sides?
Oha@lemmy.ohaa.xyz 2 weeks ago
While I know(at least to some extend) what I’m doing, I still appreciate the warning. The Monitors.only interface seem to be these Pins labeled J1 in the Manual. Image
Heres a picture of the entire Board in case that helps:
Image
AbidingOhmsLaw@lemmy.ml 2 weeks ago
A3.2 and B2.1 in the manual show you the pinouts of that jack and the expected signal, unfortunately section 6.1 schematics and sec D timing diagrams seem to be missing. You’re going to need to find a suitable driver circuit. Without looking at the timing it might accept input from an old MDA adaptor.p or similar.
en.wikipedia.org/…/IBM_Monochrome_Display_Adapter
Oha@lemmy.ohaa.xyz 1 week ago
Forgot to reply but I got another scan of the manual that includes these scans from the person that gave me the crts. i.ohaa.xyz/raw/oRiMLv.pdf
Thanks, I really appreciate your detailed answer.