Jedec Files ?

[BinaryBob]

Not strictly sure i am posting in the correct section here, please forgive me ! I am looking for somebody who can convert minimized equations from PAL16L8 into a jedec file for either the same device or a GAL16V8 device. The original devices are secured and approximately 30 years of age. I feel it is only a matter of time before they expire !? I have therefore brute-forced the inputs and recorded all of the outputs in Logic-Friday and minimized in order to obtain equations. Unfortunately, that is where my knowledge comes to an abrupt end lol ! Regards, Robert.

 

[modem7]

Welcome to these forums.

Member @jonny64 has PAL stuff at [here]. In that, of possible help to you is:

• A Python script "pete.py" to convert a PAL "EPROM dump" into a truth table and GAL equations
• A Python script "simplegalasm.py" to convert GAL equations into a JED file which can be written into a GAL16V8

 

[BinaryBob]

Hello Modem7 and many thanks for response to me! I have observed the link and must say that i have tried the CM adapter and associated analysis software which resulted in a zero result on all 6 of my protected 16L8 devices! I also notice during the CM process that when instructed to use the wincupl program to obtain the jedec files, some of the inputs are stated as 'unused' and other anomalies etc. Most of these 6 devices have more than the standard 11 inputs as some of the outputs are also configured as inputs. This i can see by reverse-engineering the board! This is why i tried the approach with the Logic-Friday' program. No, i need somebody who can do this job and i am willing to pay 2000 in whatever currency i have to lolol ! Best, Robert.

 

[djg]

Abel 4.2 software that can do both is in here:
https://groups.io/g/DataioEPROM/files/Programmable logic software tools/Data IO/ABEL/V 4.x

I recently used it so can run your files through it. We will need to convert your files to Abel format.
FYI: This is a sample abel file I recreated for a part. https://www.pdp8online.com/ftp/software/TI_PC/proms-pals/pro/video-board/u5.abl
Its registered so yours are simpler.

 

[maxtherabbit]

$2000 to replace a PAL that's not even broken? That's nuts

 

[stepan]

In the past I have reversed several PALs/GALs using Chris Hooper's Brutus28. If your PAL only does combinatorial logic (e.g. it holds no internal state / flipflops) this process is fairly straight forward. For more complex PALs there is a bit more work involved. I have written a small test framework for brutus28 to help with that process and an example test bench that makes probing the internal logic a bit easier. You will still need to understand the logic inside a little bit, but with this framework you can write a set of tests and make them pass on the original PAL and then run this test suite against your own implementation and iterate until it passes. As a starting point, having a pin-out for the device you are looking at (or even better: Schematics of the board) help a lot. Feel free to reach out if you wish to talk more (happy to converse here, too).

Stefan

 

[norwestrzh]

Not strictly sure i am posting in the correct section here, please forgive me ! I am looking for somebody who can convert minimized equations from PAL16L8 into a jedec file for either the same device or a GAL16V8 device. The original devices are secured and approximately 30 years of age. I feel it is only a matter of time before they expire !? I have therefore brute-forced the inputs and recorded all of the outputs in Logic-Friday and minimized in order to obtain equations. Unfortunately, that is where my knowledge comes to an abrupt end lol ! Regards, Robert.

I have produce .jed files from equations in the past using "DOS Box" and the old PAL/GAL compiler. I could probably do so for a GAL16V8 for you, if you send me your equations.

Roger