If you mean the smaller black upright component, I think it is a resister
pack, having
viewed it from the side. The others on the left side are voltage regulators
I think, based
on the large heat sinks they are mounted on... This is not my area of
expertise, but I pick up
things now and them by working on computer hardware and being surrounded by
engineers (electrical, mechanical,
optical/laser etc.).
As far as the mapping info, if you could figure out which is the PROM with
the map info,
AND assuming that there is a EPROM with the same pinouts, you could copy the
PROM to an EPROM.
If somebody could actually tell me which one is the prom, I could ask one of
our engineers to
cross check to see if a matching EPROM exists.
-----Original Message-----
From: William Guilford [mailto:[EMAIL PROTECTED]]
Sent: Monday, September 03, 2001 5:51 PM
To: [EMAIL PROTECTED]
Subject: Part IDs, pictures, lack of EPROMS and a suggestion
Picture 8 on the web site is *unquestionably* the atmospheric pressure
sensor,
as Randy said.
I don't recall off hand what the upright component in picture 6 is, but it
ain't
an EPROM.
The three largest chips in pictures 3, 4 and 5 (not the Toshiba ones) are
proprietary chips made by ND for Yamaha. That's the stuff we're really
interested in. There are no on-line resources for looking into these, and I
doubt that they'd be willing to simply tell us what's inside.
The Toshiba chips aren't very interesting. One is a latch, one is a
flip-flop
and one is a gate. Standard digital stuff. I identified all the standard
digital and analog chips on the board at one time, and there just isn't
anything
particularly fascinating or enlightening.
The long and the short of it, guys, is that THERE ARE NO EPROMS IN THE GTS
ECU!!! No sense trying to find one. EPROMS are VERY easily identified. If
there were one in there, it would stick out like a sore thumb. Either (a)
there
is a non-standard ROM/PROM on the board that contains the mappings, or (b)
the
"mappings" are hard-wired or burned into the ND chips.
Short of a personal contact at ND or Yamaha with access to such confidential
stuff, we are highly unlikely to sort out on our own how all this works. It
is
truley a "black box."
HOWEVER, since the objective is to "transform" a 93 ECU into a 94 ECU, I
would
suggest that we compare between ECUs of the two years the IC part numbers on
those three largest chips. Odds are, one or more of them will be different,
with no other changes on the board. If we can find what chips need to be
replaced, perhaps someone can convince Yamaha or ND to cell us some ....
No, I don't believe that for a second.
Yes, I do read minds.
- Bill G.
