i recently acquired an 85 camaro. it has the original computer. it has a 350 with flat top pistons, a computer friendly crane cam, 2400 stall, crappy stock 305 heads, which is a little excessive on compression but does not ping on 93. the problem is that when i first start it and roll out, it has immense power as compared to what it has 5 minutes later. in other words power drops off as soon as it warms up a little. but even if i shut it off for a few min, and start and go that power is back for just a minute or two. just now i pulled the computer and brought it in. i bought o pocket programmer and eraser when i bought the car knowing i would have to dive into prom tuning. i pulled the prom and it says delco 32500 e5012P i believe the p means it is a one time programmable, is that true. it is a reman by gm computer. i dont want to upgrade the ecm at this point. if it is a otp where are proms available b/c i havent found a source.

 

I haven't seen any original MEMCALs equipped with EEPROMs (Electroically Erasable Programmable Read Only Memory). Most use an EPROM that requires UV light to erase, and you may not be able to program it a seocnd time, or very many times. They seem to have a questionable reprogramming cycle.

Check out www.moates.net for all your tuning needs.

 

well the biggest reason i dont think it is reprogrammable is that it has no window

 

http://www.eecis.udel.edu/~davis/z28...m870memcal.jpg

the eprom is one the right as you can see in some kind of holder, the one on that site looks different, but same holder. theres another post on here and the prom he listed was close to the numbers i have. ill link it when i find it

 

Have you looked under the silver label for a window? Unless the PROM has been recently replaced I would expect it to be an EPROM.

A OTP PROM will be in a plastic package. If it is ceramic such as the picture of the PROM you linked, it is eraseable.

RBob.

 

heres one pic another comin, wont load both

 

not much to see on the underside, but either way as u can tell it has no window, and its obviously not an eeprom

 

in the picture you linked to in post #4, the removable chip on the right is the resistor network calibration, or CALPAK. its used for cold start cranking and limp home.
the chip on the left is the PROM.

 

oh i did say right, so my other right then. thanks

 

well it is obvious i will be needing some spare proms. where are they available i found some here http://www.futurlec.com/ICEPROM.shtml whats the dif btw 200 and 250 ns?

 

Yep, that's a OTP PROM. HLK being the BCC for a '85 TPI on a 305 with an auto.

The PROM you need is this one:

27C32 32K 150ns CMOS EPROM

Although it can be as slow as 450 nsec and work.

RBob.