OK, I have a 88TPI computer, with a 27C256 chip in it, I'm trying to get the bin out of it. so far, I've putzed with the start address, etc so that i have the buffer from 04000 to 07fff, and it looks like the 'right' data in the buffer. When I try to open the file in tunercat, it tells me that it expects this file to be a type $32, which should not be, since it is a 88 ecm, correct? it should be a $32B, but the other weird part is that the chip is a 26c256. If thats the case, will the file size be 32k, and will that make tunercat throw up? This is a factory memcal, the part has a GM part number on it, and is soldered in the adapter. Where have I gone wrong?? Thanks in advance.

Tunercat is expecting to start at 0000, not 4000.
Try loading the file in the lower half and then use tunercat on it.

A 27C128 should be the "factory" chip- I've been using the AT 29C256's; changing the star to 04000. When I want to read that prom I have to change the pocket programmer to a 27C128, save the bin, then tunercat or win bin can read it correctly. Just make sure you don't leave the prom in the holder while changing. And yes that's two different voltages, but if you only read the At29C256(5v) at the 12.5v. 27C128 setting it doesn't hurt it.

OK, thanks guys, I will try that. Yeah, it's weird....27C128 should be the factory chip, but it's not....anyway, sounds like thats the key: to load the file as a 27c128. Cool...thanks.

You could also use my program to dump the EPROM content to disk through the ALDL. It's another option...
-Craig