Ok I can read my 2732 eproms with no problem but when I try to read 27c256 eproms they wilnot verify do you have to change the address settings and if so to what,also I have the adapter to read the proms while still in the memcal are there any problems with using this adapter. I am just starting out at this so please bare with me, I am using tunercat and pp1 and yes I am selecting 27c256 from the chart ... THANKS FOR ALL REPLYS

 

First, are you trying to read a BIN from a 27C256 or read it after you programmed it?

Also, what's up with the Poll you created?

 

I'd say on.

 

I was trying to read a bin from a27c256.The poll thing was a screw up (sorry)

 

All you should have to do is set the "Device" to a 27C256 and the Pocket Programmer Software should set the the voltage and start/ending addresses automatically. Then reading should be just like anything else: "Move Device" to load the eprom onto the buffer, and then "Edit Buffer" to see what's in the Buffer (read from the Device).

Now, if this is a loose 27C256, there is a possibility that the eprom itself is blank. If it is a custom Memcal (like from custom bin writer) they may have used a "Protection technique" to make it so you cannot read it. If that is the case, you will have to talk to the custom prom writer about that as we cannot discuss how to "break" someone's "Protection techniques" here.

 

I move it to the buffer and then try to verify it and it comes up saying eprom didnot verify,my programmer is set up in dos also I didnot see edit buffer on mine. Please bare with me on this all of this is new to me home pc and prom cooking. THANKS

 

Is this a "loose eprom" or Memcal, and what's it from and who?

Sorry, I don't use the old DOS versions anymore. Some had problems and that's why I went to the Windows Version.

 

I have tryed with a loose prom and one in the memcal same thing both from and 86 tpi Iroc. THANKS FOR ANY HELP GIVEN

 

86 Irocs don't use 27C256s. They use 27C128s.

And a loose eprom doesn not necessarily have anything on it. What was the Memcal from? 27C256s generally are only used n SD cars (90-92).

PLEASE tell me in FULL what EXACTLY you are doing and from what. You are only giving me the briefest of information and I cannot read minds. I need to know exactly what is coming from what and whether these are stock or aftermarket.

 

I am trying to read 3 proms 2 are from stock 86 irocs the other one is a tpis one for the 86 irocs what I have been doing is select eprom from chart install eprom in programmer Move eprom to buffer Verify eprom to buffer (it never verifys).I do the same thing with my 2732s no problem Move, Verify,Save to buffer name it find it read it.I am sorry that I am short with my explanations but it takes me awhile to just type my response, this response took me 10 minutes.

 

I must have missed this prohibition...

...But this begs the question, "Why would anyone who can read a BIN want to copy the POS chips that aftermarket vendors sell"???...

 

I can read my 2732 proms but cannot do the same with the 27c128 I would like to know what I am doing wrong.

 

Kidd,

I just got my replaced PP-II back from X-Tronics yesterday. I can read the 27C128 without any trouble, as long as I set the EPROM I.D. correctly.

This is what an '86 TPI/Auto OEM PROM looks like:

 

I set the programmer for 27c128 which is #10 on my chart my programmer is setup in dos it was suppose to have been upgraded to windows but wasnot. Helpppppppppppppp

 

First, you MAY have done something to the PP or eproms if you tried to read the 27C128s using 27C256.

Second, what makes you sure those eproms are even 27C128s? Can you read that identification on the actual eproms? The Memcal (eproms) may be from something else (like a 1985 which uses something different again).

Third, the eproms MAY have used a "protection technique" which WILL NOT all them to be read. I highly suspect the TPIS eprom may have.

Fourth, some of the earlier PP get "burnt" when used with 2732s. This may be the case with your PP and why you can read 2732s but nothing else. If you are SURE that those eproms are 27C128s and POSITIVE that those eproms came from GM (especially if the eprom is still in the Memcal and you can physically see 27C128), contact Xtronics and explain your problem. It may be your PP is partially fried and you need a new one.

 

The stock prom came from the GM dealer and this might not be saying much but I just had my pp repaired.Thanks for all the help

 

Maybe it wasn't repaired quite right? I'd call Xtronics.

 

I had a similar problem, when reprogram by brother's 86 vette. To correct the problem, I was told to set the starting address to 04000. I read the chip as a 27c128 and then burn it as a 27c256(the stock whip was a 27c256) with the starting address set to 04000.

I hope this helps.

joel

 

With the Pocket Programmer?.
I've been using the DOS version for years, without a hiccup. At least 3, and I've done 100s of proms on it.

 

I've had a few GM proms that I could read, and not reprogram, dunno why.

I've had a PP repaired, and it come back with the new software. Sounds like an oversite on their part.

 

I am going to call xtronics and see what they can do I am going to try the 04000 address to see what happens. Thanks for all the help.

 

That is ONLY if you are going to re-burn a 16K Bin from a 27C128 to a 32K 27C256. Your problem appears to be that you can't read it and verify it (don't expect to be able to do this with an aftermarket if that is what you are really trying to do). It is thoroughly unneccessary to play with the start addresses when you are trying to read.

You are trying to read a 27C128 (or it should be if it is from an 86-89 MAF car). Have you read the "markings" on the GM eprom to confirm they used a 27C128? You never did fully document the eprom with ALL of the info on the chip, including the silver BCC tag. It may be that you have a "variation" of the 27C128 that requires a different voltage setting.

 

I STILL recommend talking to Xtronics - there is something more to your problem and it may very well be your PP.