While cleaning up my computer room the other day I ran across a memcal and I can't remember what it's for. It's got a blue cover and a brown base. The PROM is a D27128A and has a white sticker on top that looks like this: ASM D91- 180 All handwritten. The side of the memcal has 68767 8747 stamped into it and there are two chips, a 16055375 and a 16055376 which I assume are the resister networks. Basically I'm wondering if I can use this memcal to make a ZIF adapter for my '165 ECM but I don't want to destroy it until I have an idea of what it is. Thanks.

'86 S-10 2.8 Man

I'm not trying to be argumentative but I thought the early S-10 ECM's used a "stand alone" PROM not a memcal. I'm almost positive my friend's 87 TBI 2.8 S-10 was only a PROM.

Either way can I safely use this to make a ZIF adapter for the '165 in my 88 TPI or will the resister networks be all wrong for limp home?

I can only quote on what the info I have says, maybe wrong, dunno. I was wrong once before, so maybe this is a second time.



Nope, I wouldn't suggest it.

Thanks Grumpy...you're probably right in saying it's not safe to use as an adapter since I can't be certain of it's "identity". I'll have to ask my S-Truck driving friend when/if any of them came with memcals.

Funny thing is I can't remember when/where I got it from.

Just for the lack of anything else to do, I looked thru a Snap-On prom book. The also list it as MY87, and also as MY88. For those same two years one of the ecms used for the 2.8 was the 1227730.

Now the plot thickens...maybe

I got home from work and pulled up my Mitchell On-Demand and the ASM code does show to be from a S-Series manual trans.

However http://www.cruzers.com/~ludis/calxref.html shows the resistor chips are for a 1987 5.0L LB9 using a '165 ECM, and an archived post on diy-efi.org dated 10/01/99 seems to agree. To make matters worse Mitchell On-Demand shows a code AASM (that's close to ASM) for an 87 5.0L but it's the LG4 carbed application with a '855 ECM.

Now I'm REALLY confused!!!

I think I'm just going to put the cover back on this memcal and loose it again!

Feed it to the fishies, perferably the deep salt water type.

The side of the memcal has 68767 8747 stamped into it and there are two chips, a 16055375 and a 16055376 which I assume are the resister networks.

Basically I'm wondering if I can use this memcal to make a ZIF adapter for my '165 ECM but I don't want to destroy it until I have an idea of what it is.

Don't throw it away too quick....
those numbers sound familiar
I'll check for you tomorrow
At least the prom is right D27128A