odddoylerules

Ok, I am tired of paying for a lot of used chips just to find half of them or more wont work, have damaged pins.

I would much rather just pay a little more for fresh chips, but i cant really find them, or I dont know EXACTLY what i am looking for.

I'm going to look into this more, but do any of you have a source for the stock type chip, or a manufacture part number i could google, because "2732a" is a really broad search term, and i get tons of unrelated pages.

OR

I get lots of 2732 and 2732a options, and i am unsure of what to purchase. 200ns? 250ns? Is it all the same??

I know cars, not electronics, and i googled all the visible codes on the stock chip and came up with nothing.

I checked the xtron. PP website, and the moates chip section thinking i could find a part number to search for, but alas, neither of the sources panned out.

thanks for the info, i'm sure this'll be a snap for you eprom pros.

titchener

I think its better to dump the 2732's and use the Moates adapter to convert your ECM to use a more modern EEPROM. The 2732's haven't been in production for a while and even unused ones seem troublesome.

I tried some "new" 2732A's first from Jameco, none of the 5 would burn correctly. Got a second set of "new" ones off Ebay, first one appeared to burn correctly and verified on the burner, so I thought now I'm cooking. Unfortunately a couple days later when sticking it in the ECM I got the dreaded flashing engine check lite.

Popped it out, put it on the burner to test it and found that it no longer matched the binary. Burned another one, let it sit for a while, retested it and installed it so far its been ok but I don't have much confidence in it.

Even the commericial chip I bought before I started burning my own had problems, the first one was bad when I got it (probably went bad post burning like mine did) and I had to get a replacement.

Before I doing any more tuning, I'm dumping the 2732's for the adapter.

Paul T.

Ronny

iTrader: (1)

i will say i had good luck with jameco 2732's. out of the box about 9 of 10 worked. i did return for exchange the ones that were bad from getgo. once they were cycled a bit i prob could burn each one 20 times. that is a guess.

now with the prominator i cant imagine ever using those chips again.

titchener

Ronny, which speed did you buy, 200 or 250ns?

Also what company mark did yours have, mine were marked ST.

Actually even if the chips were working better, flopping my old and fat *** down over the front seat to stick my head down next to the kick panel and swap the chips is getting pretty old, when I get to the point where I'm doing serious tuning with my currently in planning replacement TBI engine an EBL Flash is definitely in my future.

Thanks,

Paul T.

Ronny

iTrader: (1)

i was not aware two speeds were an option? i will guess it makes no difference. i have not owned a chip for well over a year so i have no idea as to what was printed on them. there were maybe 3 manufacturers that i noted. something tells me they are all equal.

RFmaster

Ronny

Back in the eighties (remember the hair and music!) UV-EPROM's came in different speed ratings - access time (or read time). The slowest of the bunch that I saw during the early eighties, at Foothill Flea market, were rated at 450ns! These were commonly found in video game machines, consoles and even in GM ECMs. 450 nS access cycle time was plenty fast for a micro processor running low MHz clock rates (1 to 2 MHz). 450 nS refers to tAVQV parameter which stands for Address Valid to Output Valid time. With advent of PC's and faster microprocessors faster EPROM's were developed such as 150, 200nSec devices.
I do not know of hand what clock rates GM ECM runs at, but anything faster than 450nS would (should) work just fine.
2732 EPROM has been obsoleted long time ago. There maybe some NOS floating around, but UV devices always have been temperamental and varied from one manufacturer to another. Another option is to get some 2732 OTP devices, but these are also hard to come by. The best way is to ditch this UV staff and go to FLASH with adaptor or EBL.

//RF

ur7x

iTrader: (2)

20 Times! and thats it? !

This is depressing as heck... I thought you could burn these over and over to your hearts content...

not so???

BMmonteSS

This really shouldn't even be a discussion, just go to the 28 pin adapter that moates has and run the sf512 chips and be done with it. They are electronicly erasable and can burned thousands of times. The price of the adapter is more than made up in the headach factor and down time waiting on more UV chips.

ur7x

iTrader: (2)

For some of the older ECMs where a ton of memory isn't needed
wouldn't a 28C16 (2816) (2816A) also work with just the right pins bent back/grounded/VCC'ed.

This 24 pin baby of the EEPROMs seem to let you have your cake and eat it to... As long as your Prom needs 16K or less of memory... For the CrossFire and C3 Carb Guys this should be plenty.

Otherwise I'm going to look at the adapter.

odddoylerules

Yeah, this is what I have done for my car, but my friends dont really care to have their ecu's modded. I usually just hook up the wideband, tune for their mods, and leave it at that.... I'm way done with swapping and reburning chips every time i change an option...

ur7x

iTrader: (2)

My "Chip head" buddy confirms that, for those who don't want to mod there ECM's or for those that are really cheap, the ~$3.99 28C16 EEPROM would be an excellent and probably superior option over the 2732 EPROM or the use once 82S181 PROM. You can still get them "NOS" and they are a lot easier to program then the 2732 which is infamous for being a bit of flaky chip.

I'm on vacation right now but when I get back i will post a wiring diagram for the 28C16.

But to quote my "chip buddy" Of course I have no idea what he is talking about... But I can vouch that this guy knows his stuff and has been mod'ing and burning chip since the mid 80's

Cflick

Lots of valid stuff here.
The 2732 is obsolete, and hasn't been manufactured in years. About half of the ones you get will work, once. A few may work a few times. Many were damaged during their first burn. They'll erase once, but won't burn at all.
There is no 2832, so I'm using 2864's. The 2816 would be fine if you didn't need 32K for the code, which you do. Anything with more pins will require an adapter, or mod the ECM, but the GM sockets are junk anyway, so that's not a bad thing.
BMmonte is right. This shouldn't even be a discussion, except not everyone has been through the muck that is 2732.

ur7x

iTrader: (2)

Depends on the car. As far as I can tell All of the CCC Quadra jet files are 16K or less.. Also all of the C3 Qjet bins used in third Gens were only 1K So plenty of room there.. Crossfire bins are also only 4K so they also fit fine...

I know most on this board are running TPI and a few are running TBI... But don't forget about us crazy old school souls who just gota (or are forced) to keep our CCC Qjets or almost as bad the Cross Fire TBI...

Six_Shooter

iTrader: (2)

Can 27C256 or 27C512 chips be used (with an adaptor) in the 7747? Or does it need to be the AT29C256 or 27SF512?

spanners

the only difference between the 27C### and 29C### and 27SF is that they are electronically erased instead of UV light they should all work fine.I myself am using UV chips because I dont even have to solder them out of the memcal in my 1227808 vp commodore ecu just burn them still in the memcal burnt one of them at least 40 times now I just give them the bare minimal erase time possible.

Six_Shooter

iTrader: (2)

Cool, that's what I had suspected.

What do you have set-up for the UV erase, and what did you find was the bare minimum erase time?

Thanks

Cflick

In a word, yes !
It has more pins, so you do need an adapter of some sort, AND you need to burn the bin in the right place so the ECM can find it.
Been using 2864's for a couple years now.

spanners

I have the eprom window about 5mm away from the light tube in a little grey eprom eraser from hongkong sometimes three to four minutes is enough but some times dont erase fully so I just give them exactly 5 minutes.my willem is playing up a bit I have to quickly put the memcal in then burn and verify then take it out quick or the programing lights come on and stuff it all up never used too do it.