Electronics > FPGA

Reading the programming of PAL chips

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brandon.arnold:

--- Quote from: AK6DN on January 26, 2024, 01:17:51 am ---As an example, my TopMaxII supports programming 16L8 PAL devices. Here is a dump of the fuse array of a National 16L8 device.
Pretty much all the vendors of 16L8/16R* devices used compatible fuse map arrays, so one could reprogram an MMI 16L8 with a National 16L8 fusemap, for example.
...
If you look at an old datasheet for a 16L8 device they will typically have a logic diagram with labeled fuses.
See attached for an example diagram. It shows the location of each of the 2048 fuses listed above.

--- End quote ---

Great information, thanks! I will definitely try this with my Xeltek, which apparently supports reading these. I'm sure I won't so lucky and they may have some security in place to make it fail.


--- Quote from: c64 on January 26, 2024, 03:24:01 am ---
--- Quote from: PCB.Wiz on January 26, 2024, 12:19:14 am ---You could make an adaptor that does what you say, "read the PAL chip like a 27C020 EEPROM", but you need to map the PLD pins to a suitable memory.
Complicating things is that some IO might be used as inputs, so a circuit of the original unit helps here.

--- End quote ---
Or output enable.
Need to use series resistors and then read the value back.

--- End quote ---

Yep I will keep this in mind as well as PCB.Wiz's warning.

EduardoLM:
The website is still there! But SSL is broken. You can try pure http:
http://dreamjam.co.uk/emuviews/readpal.php

JacobPilsen:
https://github.com/DuPAL-PAL-DUmper
https://www.8bity.cz/2022/dupal-hardware-software-for-pal-analysis/

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