[rescue] Sparc 20 schematics

Mike Spooner mikes at aalin.co.uk
Sun Nov 17 06:09:33 CST 2019

Careful with the Hyundai/Axil boards: most models used Hyundai-custom-designed
boards, not off-the-shelf Sun ones or Sun-designed ones (eg: Axil S420 had 16
SIMM slots, not just the 8 on the stock SS20 layout).

Similar applies to *some* Tatung sun4m clones.

Many/most other makes of SS20 clone used the stock SS20 board purchased direct
from Sun (and often completely populated from Sun). A not-uncommon variation
was custom OBP firmware to support some non-sun framebuffers as console
display, but that's all.

- Mike

On Sun, Nov 17, 2019 at 9:23 AM +0000, "Peter Stokes" <peter at ashlyn.co.uk>

Hi All

In the era of the Sparc 5 and 20 Sun licensed the design of the boards etc to
a few companies. I was wondering if anyone has the schematics to the Sparc 20
board (Sun,Hyundai etc) as I have a few bdeadb ones arriving and wanted to
see if any were a straight forward fix such as dead crystals etc. Having the
schematics would improve my chances of resurrecting one or more of the

Reason for this is the lack of boards out there to buy and I have a couple of
customers who are still using 20s due to EOL software on them and having many
years of designs using them.



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