stepleton's latest activity

My guess of "partial to full screen" is that the oscilloscope trace of the raw video signal shows scanlines with "stuff" for most of the...

Many times there are catalogs from the manufacturer that have been archived. Bitsavers seems to have quite a few.

That said, even with the desoldering gun, you can still run into trouble with through-hole legs sticking to pads with just a bit of...

It might be good to know that the BNC connector on the back serves a regular composite video signal. If there's anything there, it will...

I would say yes, in general. You seem committed to the hobby, so you will get a lot of mileage out of a desoldering gun. If you get a...

I imagine the pin connected to nowhere is so you can store the jumper from red to ? when not in use.

There are several more experienced 5100 owners than me, but I am pretty devoted to the first law of troubleshooting, which is "thou...

(wild guess) As it's a three-pin jumperheader, there's a chance that (for example) pin 1 is GND, pin 3 is some "source" signal pin, and...

I made progress on my 4054A display problem today. The 4052/4054A Technical Data Manual -03 has NO description of the 4054 High Voltage...

I only knew the first bit (about Eliot Miranda), who we reached out to a while ago; see earlier posts in this thread. Any chance you...

Here is my redrawn and simplified 4054 Option 31 HV and Z-Axis Intensity control LTspice simulation: I drew the adjustment pots like...

This phenomenon is called "CRT cataracts", I believe. That search term will lead you to a lot of resources.

No worries; it all started when I put the MFM into the computer backwards months ago. I thought I'd fried something, but I hadn't: it...

Update: sure enough, displacing the ROM appears to have helped. I believe I'm ready to move on to the next stage of my project!

Thanks both, I'd noticed that offset too late last night and had wondered if that was what mattered. For what it's worth, the binary...