[rescue] sun 3/60 update

[Dan Moisa]

Hi folks!

I've been working on a replica Sun 3/60 based on the online available
schematics, and I finally can report some success! I have a board fully
booting off network, this is what it looks like:
http://www.whitebearcafe.com/img/PXL_20250521_060410660.MP.jpg

I left out quite a few things because I had no confidence this was going to
work; there were quite a few errors in the schematics. I ended up with:
- only implementing the min required 4mb of RAM
- left out the SCSI and Video sections
- only put in the serial controller for A/B, left out the keyboard/mouse
- TTL serial, I didn't implement full rs232 or modem support
- left out the coax ethernet entirely
- no FPU

Everything else is there. I can boot with a regular boot prom image, pass
all the diag tests, boot off the network and load a kernel.

I'll upload the newest version to github and arrange some things better. If
I make a new version the top of the wishlist is 4MB simms, not putting more
RAM in from the start is my main regret.

All the components were available off Digikey or eBay, with only one PAL
slightly on the rare side.

Dan.

PS: I still don't know who runs https://www.sun3arc.org/ I'd love to buy
them a beer or cake, that site was a lot of help. If they prefer to stay
anonymous I'll donate to polar bears on behalf of the site's name or
something.
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