rjarratt's latest activity

I have to say I don't know or don't remember as it was quite a long time ago.

I have a DECstation 5000/240 which had a PSU problem. I don't know if the 200 uses the same PSU, but take a look at these blog posts of...

Hello again. I haven't been able to look at the VT100 again until today. I decided to try a regular PC PSU supplying the VT100 video...

I think Henk is right, the box is just terrible. It would be good to take a closer look and see what is salvageable. Cirencester is...

Yes I calibrated the probe by connecting it to the two contacts on the scope designed for this purpose. I used a plastic tool to turn...

I checked my probe against the scope's calibration output and used a test clip so that I could connect the probe ground wire directly to...

That might be a good idea, but I would prefer to get to the cause of the excessive heat really (if I can!)

Thanks Alon. I am using a 1:10 probe. I am pretty confident that the probe I was using was calibrated using the scope output, and I was...

I just measured 5.1V on Vcc to the chip. This chip is a recent replacement for the original one because I thought it might be faulty, so...

There is certainly the space to add a heatsink, but I think there must be an underlying problem causing it to get so hot in the first...

I did wonder if it might be normal, but I checked on a working VT102 and the same chip does not get anything like as hot. I can smell...

Well @bigfix sent me two DC012s. I took the old one out, soldered in a socket and installed one of the "new" chips. As you can see...

I have been trying to find these parts in the UK but I have not been able to find them. Maybe other similar fasteners would work. Maybe...

I have been looking at this further and comparing my faulty VT100 with a working VT102. I suspect that the DC012 chip may be faulty in...

I hadn't considered that it would be the first row of pixels, only the first row of characters. When I use characters that have pixels...