80286 Protected Mode Test

[Richard Pope]

Rob,
     There is probably hidden damage to the motherboard. The acid will 
follow the traces inside the board and consume them. There is no way to 
stop this kind of damage. Sorry for the bad news.
GOD Bless and Thanks,
rich!

On 3/6/2021 4:59 PM, Rob Jarratt via cctalk wrote:
> I have a DECstation 220 (Olivetti M250E) which is failing POST on a "simple
> test of the 80286 protected mode". It says in a service manual I have that
> for this test the CPU is set in the protected mode, the machine status word
> is checked to see whether it indicates the protected mode and then exits
> protected mode. This test seems to be failing. Is there any possible
> explanation for this other than a failed 80286 CPU? Could there be any
> external reason? This board suffered some battery leak damage. Clearly the
> 80286 is working well enough to execute this diagnostic and send some text
> to the screen, so it basically works.
>
>   
>
> Thanks
>
>   
>
> Rob
>
>