Hi all. Sorry it has been a while since I have been on here - life, you know, can get in the way of fun sometimes. Anyway, I have been feeling sorry for this puppy for a while and finally bought it to fix up () It is a (rather nice condition, if somewhat vintage) HP 54200D oscilloscope. As received it would not boot at all, freezing on a screen of garbage as shown in the auction photos. I did the usual checking voltages, re-seating things, etc., before suspecting the EPROMs may be starting to loose data. To that end, I read them all out on a universal programmer at several different Vcc voltages, but didn't find any terribly suspicious bits. I have tried repeatedly to find a matching set of images online to compare with and figure out which one of my EPROMs is bad, but all the copies I have found are newer and don't match. I finally burned the newer set of images to EPROMs and tried them in the oscilloscope - it booted right up! However, I would really like to restore it with its correct EPROMs, so I am asking pretty please if anyone here happens to have a similar scope and would be willing to dump the EPROMs. It might save you trouble in the future too! Here are all the images in question:
Mine are 27128 EPROMS labeled 54200-80022 through 54200-80028. The images read from my unit (KNOWN TO CONTAIN ERRORS) are here:
This is the newer set that is pretty widely found online. They are 27C256 EPROMS and are labeled 54200-80029 through 54200-80035. They can be found here:
-Matthew D'Asaro
medasaro