26 Apr
2010
26 Apr
'10
4:45 a.m.
Thanks Dave! I appreciate the effort very much.
I'll check the datasheets too but there may be one pin that's different
on the 8355 from the 8755. On the SDK-85 board, there is a strapping
option to choose which device you are using and it messes with a +5 or
GND pull on one pin. Pin 5 seems vaguely familiar but I need to confirm.
So, there may be at least one difference between the two devices required
before you can fool the UniSite into reading the 8355.
Chris
On Monday (04/26/2010 at 01:08AM -0400), Dave McGuire wrote:
On Apr 24, 2010, at 8:22 PM, Chris Elmquist wrote:
--
Chris Elmquist
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.
Hmm, weird. I tried to read the ROM contents from the 8355 in my
SDK-85, but my Data I/O UniSite, when configured for an 8755A, complains
of a device insertion error. Everything is set up properly, and the
UniSite is fine, I use it all the time. I've checked the databooks and
the 8355 and the 8755 should be completely interchangeable with the
obvious exception of programmability.
I've not fired up this SDK-85 for a few years, but it worked fine
then. I have to go to sleep soon, and I'll be out for much of the day
tomorrow, but perhaps tomorrow night I'll be able to wire it up to a
power supply and see if it still runs.
-Dave
--
Dave McGuire
Port Charlotte, FL