First post, by Jed118
So my super authentic 8087 from China is overheating badly... I wasted 4 hours trying to track down all the gremlins in the JUKO system when I accidentally touched the FPU: 57 deg. Celsius according to my point-and-shoot laser thermometer. I seriously thought I lost the system - random floppy read errors, then the hard drive stopped booting, lost the MBR, Turbo stopped working (LED wouldn't light up), it just kept spiralling out of control from there, all while I was trying to get Windows 2 to work with VGA. After travelling to several computers, the hard drive has been revived (good ol' Norton Utilities was on the drive, and also I was saved by a really old set of DOS 3.3 backup diskettes from the 80s...) but I am none too pleased that this POS FPU took 6 hours of my life... /rant
Bloody thing got my V30 up to about 45-50c as well. I removed the 8087 and put in an immediate complaint with eBay (damn, I had already given good feedback based on initial tests) but seriously what the hell is going on in the FPU that it's operating at 60 deg c AT IDLE?
I did look at my CPU collection and I found that I do have what looks to be a real 8087-1 (I seem to recall removing it myself from something decades ago) but it's missing pin 20. Doesn't seem to be a problem according to this:
GND is GND, amirite? I did a continuity test between what's left of the leg of PIN 20 and PIN 1 - it's not o, hence why I am asking if any buffs out there know if I can get away with not having to solder to such a tiny pad leftover (would likely have to do it in the socket, after insertion).
Good news is that I got Windows 2 to work with VGA (copied Windows to a new directory, ran setup, it kept all the old programs working) and the system behaves well once again.