Re: P4 on sun3/sun3x (Re: NetBSD/sun3 10.0_RC2 problems on sun 3/60)

On Jan 14, 2024, at 11:47=E2=80=AFPM, Romain Dolbeau =
<[email protected]> wrote:
>=20
> Unfortunately my 3/80 motherboard blew a cap when I tried to power it
> up with my homemade ATX adapter (https://github.com/rdolbeau/SS1_ATX).
> The pinouts of the adapter seem OK to me and I haven't figured out =
why,
> I presume the cap died of old age...
> Anyway the mobo didn't give any sign of life.on the serai port when i
> tried again, so for now my idea of a P4FPGA to follow up on the
> SBusFPGA is stalled.

There's a specific tantalum capacitor in one corner of the logic board =
that *always* blows on the 3/80, and the suggestion I received from =
numerous people after mine blew was to just desolder the remnant and =
remove it, and not to bother replacing. I believe they said it's just a =
filter cap that only really matters if you have super-noisy power or =
something like that.

I've not removed mine yet, but I plan to whenever I get back to playing =
with my 3/80. Fortunately I was just powering up the bare board when it =
blew, so I don't have anything to clean up inside the case. Had to let =
things air out a bit though...

  -- Chris