[rescue] SS10 / SS20 Memory and SS10 or SS20 Clone?

Curtis H. Wilbar Jr. rescue at hawkmountain.net
Fri Jul 18 09:20:38 CDT 2003

If this is a sparcengine 20 mainboard, it will look for all intensive
purposes almost entirely like a sparcstation 10 mainboard.  Not till
you get the two side by side and start analyzing the differences do
you realize it is NOT a Sparcstation 10 mainboard.

Look at all your oscilators, a Sparcengine 20 mainboard will have a
80 and 100 MHZ oscilator (and possibly a couple of others as well).
These correspond to 40 and 50 MHZ MBUS speeds.

(at least I think they are 80 and 100, not 40 and 50 MHZ Oscilators).

The 13W3 only appears on Sparcstation 10SX and SparcEngine 20 mainboards,
and given that SS20 clones (at least some of them) used SparcEngine 20
mainboards, I'd imagine that is what you have.

-- Curt

>Date: Fri, 18 Jul 2003 07:28:35 -0400 (EDT)
>From: adh at an.bradford.ma.us (Sandwich Maker)
>To: rescue at sunhelp.org
>Subject: Re: [rescue] SS10 / SS20 Memory and SS10 or SS20 Clone?
>"From: Jochen Kunz <jkunz at unixag-kl.fh-kl.de>
>"On 2003.07.18 04:28 Sandwich Maker wrote:
>"> that smells more like an ss10sx, but iirc they used the ss20 chipset,
>"> so if it was 'chipped' to 100/50 MHz system clock it would be
>"> essentially a 20.  and the prom is a good sign.
>"Hmm. The machine looks mostly, but not exactely like the SS10 on
>"It has a 80 MHz oscillator and ISDN blow the MBUS slots. So with the
>"13W3 connector it looks like a slightly different SS10.
><sigh>  but why would the obp say ss20?  iirc ss20 firmware doesn't
>work in a ss10, except for the ross 2.25R which was specifically coded
>to handle both.
>you could try chipping it to 100MHz...  it's been done to vanilla
>ss10s, but i don't know if and/or how long they're reliable.  perhaps
>replace the 66/72 MHz osc, so you could jumper it back to 80 if it was
>Andrew Hay                                  the genius nature
>internet rambler                            is to see what all have seen
>adh at an.bradford.ma.us                       and think what none thought
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Curtis Wilbar
Hawk Mountain Networks
rescue at hawkmountain.net

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