[rescue] Sparc 20 schematics

Dave McGuire mcguire at neurotica.com
Sun Nov 17 10:12:13 CST 2019

On 11/17/19 7:09 AM, Mike Spooner wrote:
> 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).

  I remember those!  We beta-tested the Axil 420 at Digex (we were a
huge Axil customer) that had 1GB of RAM, in 1996.  It was an amazing

  The additional memory capacity necessitated changes to the MMU code in
the kernel.  Axil shipped a modified copy of SunOS 4.1.4 for those
systems.  The only differences were in the kvm tree
(/usr/kvm/sys/sun4m), and as we had merged those at Digex and just added
the Axil 420 as an additional kvm tree.

  I wonder which one of us got that Axil 420.  I should ask around.

  If anyone has one and is trying to get it running, I have a copy of
that kvm tree in my archives.


Dave McGuire, AK4HZ
New Kensington, PA

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