Troubleshooting a 286.. oscope level!

Fred Cisin cisin at
Sat Oct 3 12:20:56 CDT 2015

> On Oct 2, 2015, at 10:21 PM, ethan at wrote:
>> Hello everyone,
>>  I'm working to troubleshoot a 286 laptop style computer. I've kind of 
>> hit the end of my knowledge and wondering if anyone has any insight.
>>  The computer in question I've never seen run. So I don't know normal 
>> behavior. There were a few caps inside that were leaking electrolyte, I 
>> cleaned it all up and replaced them. A few traces look a little bit 
>> corroded but test fine.

On Sat, 3 Oct 2015, Zane Healy wrote:
> When you drop into BIOS, is anything actually set?  Can you set the 
> time, and get it to stick?


First question:
How far does the machine in question get in the start-up?
Does it get to the point of initializing video?

Do you get any POST codes?
(those are BEFORE you can "drop into BIOS", which I assume means goto the 
"CMOS setup"

> I have a Twinhead 386sx/16 I bought new, the only thing I've used it for in the past 20 years is a serial terminal, and every time I go to boot it, I have to drop into BIOS, and configure things, as the BIOS battery is long dead.
> Zane

Fred Cisin                      cisin at
PO Box 1236                     (510) 558-9366
Berkeley, CA 94701-1236

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