25 Apr
2010
25 Apr
'10
7:51 p.m.
On Apr 24, 2010, at 8:22 PM, Chris Elmquist wrote:
I obtained an Intel SDK-85 eval board some time ago
and decided to try
to bring it back to life today. It had been part of a Philips logic
analyzer demo system apparently. They had cut off the prototyping
area
on the left side and put their own board there instead... which had a
2716 EPROM on it and some hardware to generate glitches as part of the
logic analyzer demo I guess.
Neat!
In any case, I undid all of their mods (except of
course, putting the
sawed off prototype section back on!) and the unit sort of works.
Innnnteresting.
What I have discovered is that the 8355 ROM+IO chip is
flakey. It
won't
work unless I freeze it with component cooler. Once I have done that,
then it starts working and stays working for hours as long as power is
not removed. If it gets powered down, then I have to freeze it again
before the device will respond with valid fetches.
Bizarre.
I don't suppose anyone has a spare 8355 with
SDK-85 monitor burned in
it do they?
I'm guessing that's probably unobtainium so, failing that,
wondering if
there's a .HEX of the ROM image floating around so that I don't
have to
type it all in. If I have the bits, I can burn a 8755 that drops
into
the same location.
I have an SDK-85 handy; I'll see if my UniSite can read it when
configured for an 8755. I'll send you a hex file if I'm successful.
-Dave
--
Dave McGuire
Port Charlotte, FL