27 Mar
2005
27 Mar
'05
11:44 p.m.
On Sun, 27 Mar 2005 22:58:01 +0100, John Honniball
<coredump at gifford.co.uk> wrote:
There's a Zilog serial chip, quite close to the
serial connector.
If it's just bit 6 that's faulty, it sounds like a fault in that
chip (in the parallel section). I think it's a Z8530.
Suns (as well as old Macintoshes, etc.) do use Z8530s for serial
ports. Depending on the vintage of Sun, it's likely to be in a PLCC
package, though. Dunno much about the Sun 3 line, so I can't say. I
do have some experience with the Z8530... they were shipped in several
speed increments (we used to use the 4MHz version on our later
COMBOARDs), so make sure if you find/pull a replacement that the speed
matches. I _think_ 8MHz was the fastest version made.
-ethan