Blazerguy

Hey all, I currently have a chip adapter w/ an aftermarket chip and tried to read the aftermarket chip rather than trying to desolder the OEM one from my memcal. The pocket programmer found it, read, and saved a file but every table I have looked at so far is all zeroes. Did I not read it correctly, or is this a case of an aftermarket chip being encrypted or protected in some fashion?

funstick

what kind of chip who made it ?? what size chip what ecm ??

Blazerguy

Oh, sorry that would help, no doubt


ECM 16197427 broadcast codeBNRT

Prom soldered in the memcal is labeled as follows:
014
67633
B9442AJ

The Fastchips chip on adaptor board is labeled as follows:
CY27C512
90WC
9714
105246

I haven't been at this enough to find the brand of these chips. Thanx again.

funstick

try reading the chip at a $8000 offset. see if you find your data.

Blazerguy

:hail: :hail:

Many thanks, I will try that. Looks like it will be later this weekend, I gotta work before I can play. Seems that I have to do some tuning on a f.a.s.t. EFI equipped 455 Olds in an 85 442. Engine builder said the thing will run up to 6000 rpm all day long. Geez, that is a lot of stroke to rev that high. Should be lots of... um... work. Yeah, that's the word.

Grim Reaper

Often, chip manufacturers purposely employ techniques to stop you from reading their chip (they call it protection). They DON'T want you to read it and make it purposely as difficult as possible.

And, if yo DO endup getting the bin, they also will do a variety of tricks to make it so you can't read the bin with a bin editor like TunerCat. Worst case, they sometimes "scramble" the location of the tables.

In most cases, these aftermarket eproms are nothing special anyway. I know a lot of aftermarket eproms for MAF cars actually use the ARAP bin as their "model" and they REALLY didn't change that much. I swear that sometimes they employ these "protection techniques" not because their eprom is so great, but because they did so little. They don't want you to know how little they really changed and try to make it as difficult as possible to read. Call it "cover your butt".

For all the "time and effort" you are about to spend in trying to overcome their "protection techniques", (and discover they did virtually nothing) it is often better to start with a "virgin base" GM bin that closest match your application and tune from there.

funstick

werd.