Identifying ECM and such from 87 TPI

[Ludis Langens]

> Craig Moates wrote:
> 
> On the 28-pin EPROM (is this a 27C128?):
> Delco ACXS1088, 80581 5012A 16240008S

ACXS1088 = broadcast code

Interesting, you should have seen 69300 on the EPROM someplace.  That's
GM's code for a 27C128.  Perhaps your MEMCAL is so old it uses an NMOS 27128.

> 14-pin chips next to EPROM (what are these? any cross-reference):
> 16055375 (2) 8631, 16055376 (3) 8634 (scuffed up, may be incorrect
> numbering)

16055375, 16055376 = limp home calibration.  See:
  http://www.cruzers.com/~ludis/calxref.html
8631, 8634 = made in the 31st and 34th weeks of 1986

> Connector which holds above-three chips:
> 16035006 8621

35006 = the plastic shell.  Most (newer) MEMCALs use 68767, though I
can't see any difference.

> Stickers on ECM harness connectors:
> 07716500983370048 (newer sticker, says REMAN)
> 975101200116072 (old sticker, under 2 other layers of REMAN)

Probably serial numbers.  Looks like you have three people's junk - or
the innocent victim  of three parts swappers.

> Stamp on metal cover:
> 16047243

Part number for the cover?

> Sticker on metal cover (big, wide, seems to be designed to identify
> unit in terms of remanufacturing):
> #: 7-7165 (does this indicate it's a 1227165?), Calibration code:
> 1298MG

7-7165 = Yes, you should have a 1227165.  GM didn't reman your ECM,
"ASE" did.

> Printed on the circuit board:
> 34E973, 34G973, 34E97 P1

Circuit board artwork numbers.

> Chips on board:
> 185-16034980-D08552Z, 185-16045148-MD8604N, 34985, 34986, 52444,
> 34987, 34988, 1088-8

16034980 = MPU
16045148 = timer chip
34985 = ALDL signal driver/receiver
34986 = limp home controller
34987 = O2 amplifier
34988 = AtoD
52444 = I/O buffer

185 = I think this means that Motorola made those chips
466 = Probably Delco Electronics
014 = National Semiconductor?
980 = Texas Instruments?

> Also, the board has what appears to be a big VOM(?) or capacitor, and
> a jumper wire from the 34988 to ground(?).

Jumper wire, yup.  You've got yourself an _old_ '165.  The 52444 also
means an old ECM.

-- 
Ludis Langens                               ludis (at) cruzers (dot) com
Mac, Fiero, & engine controller goodies:  http://www.cruzers.com/~ludis/