[rescue] Sun 3/50 Schematics

[Peter Stokes]

Hi Todd

Good to see you are adding to your collection…!

Back in the day it was often the voltage translators which blew, not necessarily the TTL logic, so a quick meter through of the input should reveal the chips attached to the input line?

Worth a try if you do not come up with the schematics.

Peter

Sent from my iPad

> On 11 Mar 2024, at 20:21, Todd Vernon via rescue <rescue at sunhelp.org> wrote:
> 
> 
> Hello,
> 
> Background:
> 
> I recently got a Sun 3/50 that seems to boot into the ROM check fine which I can witness via Serial Port A.  All attempts to interact via the keyboard fail.  I have a Null Modem cable I use with all my Sun Sparc boxes and after using breakouts and other alternate schemes Im quite sure that something in the port A input processing isn’t working.  If I fill the keyboard buffer on boot I can occasionally get the test menu to come up so something is getting through once in a while.
> 
> Request:
> 
> I’ve had other machines in my collection where the some of 7400 logic got shocked with a static charge and it’s relatively easy to debug and fix if you have the schematics.  I can’t seem to find 3/50 schematics out there.  If anyone has them It would be super helpful!
> 
> Thanks!
> 
> -t 
> 
> 
> Todd Vernon
> Entrepreneur | Investor
> Email: todd at toddvernon.com
> LinkedIn: toddvernon
> _______________________________________________
> rescue list - http://sunhelp.org/mailman/listinfo/rescue_sunhelp.org
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://sunhelp.org/pipermail/rescue_sunhelp.org/attachments/20240311/ec041924/attachment.html>