Cleaned up a bit, isopropanol & and an old genuine bristle French toothbrush (rare now) employed to help clean the upper edges...
It seems it was just colourful grime ...
And fine cotton cloth, a bit of a wipe-down.
Not perfect, nowhere near it, but perhaps an improvement
On foil, under lights.
Since then, I've thought;- do I have another XT PC left; that I could test these in?
- yes, a Zenith Supersport ZFL-184-01, an XT laptop that served well earlier... the printed book manual I have shows me that there is an option 8087 slot, easily accessed; I've checked and seen that it's empty.
Question is, if it goes again after all these years, which it might;- I had had fun even up to MSDOS6.2 with it, as I recall;- and even Win95 dos;-
(Update it does go, still!)
How can I check that an installed 8087 co=processor is installed, under DOS? Can it be shown existing and working, I ask myself, and search.
Apparently so, with MSD.EXE Version 2.11 (Microsoft Diagnostics Utility). So I've downloaded that. But will need to organise another DOS PC to copy.
Or make up a Laplink cable again, or find my old one... it's been a while since I was back in this realm!
And, I've learned more about 8087s, and that the Zenith specified an 8087-2 - http://terminus.tzo.com/zds/faq.htm#faq2
So I'm going to hold off on the offer until I can prove that they're recognised. Which means also building/configuring a DOS PC again.
The most likely (and slowest) candidate I have now (apart from the said Zenith & the possible Corona luggables) is a Compaq DX2-66 (or DX4-100).
Thanks for the PM, ZL2AOX - the Amiga keyboard is certainly yours, and for the note of interest, Spiderweb.
Bear with me while I venture back & check them out...
For some reason Happiness Stan , Ogden's Nut Gone Flake comes to mind...
Cheers! ~ Ross.