Does anyone know what the digikey part number is for the EEPROM that directly replaces the 2732 chip in the 6869 ECM?

As well, if someone would like to share a known 2-bar bin file for the 6869 ECM without the knock sensor code enabled, I would be forever gratefull..

Thanks!

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Andrew MacPherson
86 2M6 - Turbo what?
82 Z28 - www.ttz28.com
96 CRAPalier - Beater

quote Originally posted by Mac: Does anyone know what the digikey part number is for the EEPROM that directly replaces the 2732 chip in the 6869 ECM? As well, if someone would like to share a known 2-bar bin file for the 6869 ECM without the knock sensor code enabled, I would be forever gratefull.. Thanks!

Any 2732 EPROM should work, as long as it's the DIP package. Looking at Digikey, it doesn't appear that they stock the 2732, not surprising as it would likely be considered obsolete. However, a quick search at google for "eprom" and "2732" turned up a multitude of hits, including:
http://www.futurlec.com/Memory/2732pr.shtml

Allied Electronics (http://www.alliedelec.com) and Mouser Electronics (http://www.mouser.com) stock the NTE replacement, but at $26+ each I'd say NOT!

I've seen these used before for under $2 each, and I've also robbed them off of old PC mother boards. By old, I mean like 80286 and 80386 boards, and I've also seen them on a few ancient ISA VGA video boards, the kind that fit the old boards above.

JazzMan

Thanks Jazzman, but I need an EEPROM, not an EPROM.. There has to be a replacement type chip out there somewhere..

Anyone?

If you want EEPROM you will probably have to use one of the current chips and build an adaptor for it. The advantage is that you could load several versions into the bigger PROM and switch them almost on the fly. (You would want to shut the engine off when switching code.) If you want to build a full daughter board then you could even program the thing in place.

Even with EEPROM in an add on board, you wouldn't want to program it while driving. You really want to shut the engine off while trying to program. If anything goes wrong programming with the engine running you could fry the motor or worse wreck the car. There is a very real chance of crashing the ECM cpu as it's not set up to share the PROM chip. Depending on how the ECM crashed you can damage things.

If you are planning to pull the chip for programming there is not much benifit to EEPROM. You can build a UV eraser cheap and it doesn't take all that long. EPROM is cheap enough you could have a bunch of blanks ready to go. (Best to have several anyway in case you damage one.) You can burn an EPROM just about as fast as EEPROM these days.

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No good ever came from dark and spooky. Norville "Shaggy" Rogers

The Ogre's Fiero Cave (It's also at the top of every forum page...)

I guess if you want an EEPROM, it would be a 28F32 (or 29F32).

For the cost of a cheap eraser and 2732's (or 27C32), I guess it would be cheaper. Considering the 2732 is older than the hills, I'm not too sure that many companies made eeprom versions.

You could use a 28F64 if you wire the upper address line high.

As always, check the pin outs. They might be slightly different.

[This message has been edited by TK (edited 08-16-2003).]

Thanks guys! I really wasn't thinking of using a UV eraser, but after reading your posts, picking up 50 2732 EPROMS off of ebay and building a DIY UV eraser seems like the ticket..

I did email Craig Moates and he sells adapters to fit the 29C256 chips on there.. That's an option as well.. I guess it boils down to how lazy I am..

Thanks again guys, much appreciated!

quote Originally posted by Mac: Thanks guys! I really wasn't thinking of using a UV eraser, but after reading your posts, picking up 50 2732 EPROMS off of ebay and building a DIY UV eraser seems like the ticket.. I did email Craig Moates and he sells adapters to fit the 29C256 chips on there.. That's an option as well.. I guess it boils down to how lazy I am.. Thanks again guys, much appreciated!

Dr. Circuit?

A little note, the cheap erasers usually don't have a timer and are often quite powerful. Do yourself and the eproms a favor and if they are blank, program one and erase it in one minute intervals until it consistantly erasers. Then add two minutes to that. That's your standard erase time for that manufacturer.

If you just throw them in there for a long time, you can wreck them pretty quick. You start getting no eraser or problems program. The older 2708 through 2764's of the late 1900's don't like being over erased.

[This message has been edited by TK (edited 08-18-2003).]

Thanks for the tip TK..

I've been playing around with the 555 timer quite a bit lately and was thinking of building a simple circuit to time the erasing process.. Just need to add a pot or two and I could erase for as long or as short a time as I want..

Cheers,