i would like to know if $6e code can be used on a prom that had
32b on it originally.
also is there a reference on the net that shows which proms are compatible with the different code ?
any help would be appreciated, thanks
mike

 

Once erased, you can rewrite any code on a prom. Assuming the prom is the same size as the code you want to write on it.

The different codes, are ecm specific. There is some limited swapping possible.

 

Care to elaborate a bit on this one, Grumpy? You piqued my curiosity.

 

Along those lines...
Can I ask an obvious (dumb) question?
The 7747 bin is only 4K. But the ECM uses a 2732 chip. The bin is loaded once.
Can you use a 2716 or a 2764.
I have read about bin stacking on the EEPROMs but what about the standard 27XX eproms.
And what would you do for the 2716?


Thanks,

 

While you can't mix codes from C3 to P4, because of the ALDL differences. Well that and on the C3s the code is split from ROM to PROM.
You can run 88, 8D, and 58 (as well as others) in the 730s or 749s.
Or the 32, 32B, 6E, and 5D (?) in the 165/808.

You can also cross *code* some of the later truck pcms.

 

What about...say...between $42 and $61?

 

The {7747 bin is only 4K} 4KB, bytes. {But the ECM uses a 2732 chip}, 32Kb, bits. 32Kb / 8 bits/byte = 4KB.

RBob.

 

No, they are C3's with 1/3 in PROM & 2/3's in ROM. Same exact hardware, different firmware.

RBob.

 

I see said the blind man!!

So it is possible to double stack the bin and use the 2764 chip.
Does the ECM even care what chip or is it just looking at a specific address and as long as it is there all is good.

Thanks for the continuing lessons RBob.

 

Can use a 64Kb PROM and double stack, 128Kb PROM and quad stack, 256Kb PROM. . .

ECM doesn't care, just need the ~CS line, 12 lower address lines and the 8 data lines (VCC & GND). Then bank select which bin with the address line(s) above the first 12.

RBob.

 

I found that the best solution is to have a MemCal that correspond o the same year of the car, put in other way, if you use a $6E code (No start up injector) you will be the best with a MemCal of this type of car, that is because the MemCal consist of two different parts, first the EPROM and the other is the "Limp Home" mode Chips or resistors.
You can see this under the blue cover of the MemCal.
Using a different MemCal can result in a different "Limp Home" mode.
Please correct me if I am wrong.
This is what I have understood from reading this wonderful group.
For checking of codes see the webpage: http://gmpcm.home.comcast.net/
Regards,
Cobra289

 

to be more specific i have a memcal from an 88 tpi and i would like to use 6e code on it
will there be any problems ?
i don't need the cold start injector and im more familiar with tuning 6e.
thanks for the replies,
mike

 

Yeah...I am kinda familiar with the resistors (NETRES)...I just killed mine while attempting to swap it from an 8746 to a 7747. New ECM time for me...I am happy that it is tax return season...the $75 bill won't hurt so much.

 

Yes, you can just change the code, on the memcal, and be OK so long as it's the appropiriate memcal.

 

thanks grumpy
any more examples would be apreciated,
mike

 

i dont under stand what you ment by appropiriate memcal?

maybe you could also clear this up for me. i read some place that you could use any memcal so long as you added the corect eeprom you need for the car.

for some reason i find that hard to bleive

 

Example, the 730, 727, 749 ecms (that are used in our applications) have the ESC circuitry for the knock sensor on the memcal, where the 165, 808 have a seperate ESC module.

Beyond that, for a memcal with the ESC onboard, you should have it close the engine size from what I remember reading (or was it just the sensor that mattered?)

Someone chime in here: don't you also need to match the engine type (4,6,8 cyl)?

 

Memcals have an eprom, netres, and sometimes a ESC filter.

The Eprom can be from 128 to 512 long.
The netres, network resistor sets the limp home mode calibration, and the cylinder select.

It's best to use the latest memcal available for any chip burning, as the newer the more likely it is to have any final touches in the netres, and filtering.

At a min it must have the proper cylinder select.

 

Dunno about the 165, but no 808's that I know of have a separate ESC module. The 808's in V6 Holdens and (at least some) HSV V8's have a knock board on the memcal. The standard V8's apparently didn't.

John

 

I am running $6E bins (modified ARAP) on a flash EEPROM with my stock 88 memcal. Works fine lasts long time. 165 ecm.

I started with $32B code on the UV chips, that got to be a hassle so I went to the flash chips and the $6E code. I been thinking about going back and try some $32B bins on the flash chips. Just to try using that BPW vs load table. But no highway mode in $32B.

Now if only we could put that BPW table in the $6E tdf..................