[rescue] sun 3/60 update

[Romain Dolbeau]

Le mer. 21 mai 2025 à 08:59, Dan Moisa via rescue <rescue at sunhelp.org> a écrit :
> 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

Oh, very nice!

What software did you use for Schematics / PCB ? How many layers are needed ?

> 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

>From the pictures it seems you're not targeting a
for-factor-compatible redesign, so maybe standard connectors could be
used ? For instance 72-pins 32-bits DRAM are still reasonably easy to
find, PC PSU are plentiful, ...

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

That's fortunate; 5V-compatible devices are slowly disappearing.
Xilinx has cancelled their last 5V-compatible (but 3.3V natively) CPLD
family some months ago, and newer manufacturers sometimes are
2.5V-only, not even 3.3V :-(

Cordially,

-- 
Romain Dolbeau