[rescue] Sun 386i

alan at alanlee.org alan at alanlee.org
Sun Feb 24 10:51:25 CST 2019

All diagnostics pass except for CPU.  I was getting strangeness using a 
real 3.5" floppy drive so I switch to an emulator.  Even now, at 
seemingly random places in the boot-up process, I get exception faults.. 
It may boot the diag disk successfully 2/3 times and fail 1 of 3 - in 
different places.  Seems as if I have something wrong with the 
motherboard or cache sub-system.  The 80385 was from a prototype upgrade 
board from a Tandy 5000 MC.  So it's not known working.  I have another 
80385 on the way.  I'll order replacement cache SRAMs and DMA chip as 
well to have for A/B swap diagnostics.  Seems I'm stuck for now.


On 2019-02-24 09:00, alan at alanlee.org wrote:
> Thanks.  I did follow the guidance in the first link and did confirm
> my main board part number matches the rev 3 artwork code in that link
> and the faq.
> NVRAM contents still persist this morning.  I don't believe the T02s
> have an exposed battery lead.  Is there any way other than measuring
> the voltage I can tell a marginal battery?
> Thanks for all the suggestions.  Going to try a different set of chips
> after breakfast as well as SunOS 4.0.1 install images.
> -Alan

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