Generic chip for '89 PROM?
Thread Starter
Burning Brakes
Joined: Dec 2003
Posts: 1,183
Likes: 1
From: MidOhio
Generic chip for '89 PROM?
Anyone out there know what generic EPROM or EEPROM will replace the factory PROM chip in a late build '89 (SN 19500). ECM is 88999194, a replacement for the original, I guess. 
Thread Starter
Burning Brakes
Joined: Dec 2003
Posts: 1,183
Likes: 1
From: MidOhio
My car has a Hypertech Thermo chip in it and I figure sooner or later I'll probably get into burning my own chip. At present I may have a chance to get a programmer for free so I thought I'd better get some info.
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Here is a link to a calibration identifier:
http://tis2web.service.gm.com/tis2web
Once you enter your VIN I believe it will supply calibration codes in a "release sequence". I'm quite sure there are reasons to want to use particular "calibrations" for a base to build from.
Most information you're looking for are already sorted and have been evaluated in the C4 "scan & tune" section.
http://tis2web.service.gm.com/tis2web
Once you enter your VIN I believe it will supply calibration codes in a "release sequence". I'm quite sure there are reasons to want to use particular "calibrations" for a base to build from.
Most information you're looking for are already sorted and have been evaluated in the C4 "scan & tune" section.
Thread Starter
Burning Brakes
Joined: Dec 2003
Posts: 1,183
Likes: 1
From: MidOhio
Here is a link to a calibration identifier:
http://tis2web.service.gm.com/tis2web
Once you enter your VIN I believe it will supply calibration codes in a "release sequence". I'm quite sure there are reasons to want to use particular "calibrations" for a base to build from.
Most information you're looking for are already sorted and have been evaluated in the C4 "scan & tune" section.
http://tis2web.service.gm.com/tis2web
Once you enter your VIN I believe it will supply calibration codes in a "release sequence". I'm quite sure there are reasons to want to use particular "calibrations" for a base to build from.
Most information you're looking for are already sorted and have been evaluated in the C4 "scan & tune" section.
Since none of the "Controller" number options available have any PN's which show a "CVN" number, I couldn't get into the CVN look-up to see what that might tell me. It's all Greek at the moment.
The original intent of this thread was to verify what generic chip is used in the '89 ECM so I can verify if the programmer I can get for free will burn that chip. So far I've heard a 27c128, 27c256 or 29c256 chip will substitute.
If you care to enlighten me on the meanings of that GM sites terminology I'd be grateful, but I'll understand if you pass.
Burning Brakes
Joined: Aug 2006
Posts: 1,061
Likes: 99
From: Seattle WA
The 27c128 is the stock chip. A 27c256 will also work - it just reads the program from the second 128k on the chip. The programmer can offset it for you, or do like I do and just add the bin to itself with a DOS command.
I use 29c256 chips because they're rewritable without having to use a UV eraser. I bet your hypertech chip is rewritable, too.
I use 29c256 chips because they're rewritable without having to use a UV eraser. I bet your hypertech chip is rewritable, too.
Thread Starter
Burning Brakes
Joined: Dec 2003
Posts: 1,183
Likes: 1
From: MidOhio
The 27c128 is the stock chip. A 27c256 will also work - it just reads the program from the second 128k on the chip. The programmer can offset it for you, or do like I do and just add the bin to itself with a DOS command.
I use 29c256 chips because they're rewritable without having to use a UV eraser. I bet your hypertech chip is rewritable, too.
I use 29c256 chips because they're rewritable without having to use a UV eraser. I bet your hypertech chip is rewritable, too.
Burning Brakes
Joined: Aug 2006
Posts: 1,061
Likes: 99
From: Seattle WA
Read the stickies at the top of here:
http://www.thirdgen.org/techboard/diy-prom/
This will tell you everything you need to know to start burning chips. What model programmer are you trying to use?
http://www.thirdgen.org/techboard/diy-prom/
This will tell you everything you need to know to start burning chips. What model programmer are you trying to use?
Thread Starter
Burning Brakes
Joined: Dec 2003
Posts: 1,183
Likes: 1
From: MidOhio
Read the stickies at the top of here:
http://www.thirdgen.org/techboard/diy-prom/
This will tell you everything you need to know to start burning chips. What model programmer are you trying to use?
http://www.thirdgen.org/techboard/diy-prom/
This will tell you everything you need to know to start burning chips. What model programmer are you trying to use?
Burning Brakes
Joined: Aug 2006
Posts: 1,061
Likes: 99
From: Seattle WA
It's a BP Microsystems EP-1, one of the first on the market I take it. My investigations at work today haven't unearthed any more data or such on it. Some of the electronic guys were telling me they think the main computer that the previous engineers used with it was a 286 laptop.That gives you an idea of how long ago it has been. The IT guy that might still have that laptop on his junk rack won't be back till next Tue, so I have to wait. Boy, do I hate waiting. I may have to switch to reviving the next oldest obsolete unit. If worst comes to worst, I could probably use their newest unit but would take second or third fiddle to the engineers and e-techs. I'll prowl that site and see what I can learn. It's been 20 years since I burned chips-Mac 512 to Mac Plus as I remember. Don't ask where I got the +chips to copy!
There's really no need for anything fancy. Writing an EPROM is a simple task. The fancy stuff comes in handy for editing your bin files.
What do you mean by "custom chips only" ?
Thread Starter
Burning Brakes
Joined: Dec 2003
Posts: 1,183
Likes: 1
From: MidOhio
Email tech@bpmicro.com. Someone will give you the old DOS software and you'll be on your way. Even though they don't officially support it, unofficially they're very willing to help. I had an EP-1140 that I used for a while and still have the software for it, but I don't think it will do you any good.
There's really no need for anything fancy. Writing an EPROM is a simple task. The fancy stuff comes in handy for editing your bin files.
There's really no need for anything fancy. Writing an EPROM is a simple task. The fancy stuff comes in handy for editing your bin files.
