11 March 2021, 03:48 | #1 | |
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Reading a GAL16V8
I'm trying to read the GALs from a Supra Wordsync SCSI card using a TL866II programmer. The output below is an example of what I get, which is not what I expected. I fear the read protect fuse may be set on these. Any thoughts?
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11 March 2021, 08:20 | #2 |
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All '1' means it's read protected.
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11 March 2021, 11:24 | #3 |
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11 March 2021, 11:29 | #4 |
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Would be unusual for a GAL from a once working expansion to erase itself completely...
Btw., Matze from a1k.org has developed an Arduino shield called Galdurino and accompanying software that is able to read the contents of read protected GALs by exploiting a bug in the read protection. It's very hacky, but it works (have one myself). |
11 March 2021, 14:09 | #5 | |
ex. demoscener "Bigmama"
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That's cool! |
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11 March 2021, 17:31 | #6 | |
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On a side note, has anyone here reverse engineered a GAL to determine the equations or logic behavior? |
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11 March 2021, 18:49 | #7 |
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People like Cosmos and Matze did such things. Essentially, the jedec file can be disassembled if you can read it out of the GAL.
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12 March 2021, 03:26 | #8 | |
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I wonder if that is possible with the TL866II with some hacked together adapter board? I do not want another gadget around. I also do not want to fry my existing GALs. That would brick my working Wordsync card. |
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05 April 2021, 13:26 | #9 | |
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Yes, I did it as part of getting the DSP working on AA3000+. It's a pain in the bum to do because the only software I found that could do it was ancient - it meant running OpalJr via dosbox... It works though. |
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23 October 2021, 23:17 | #10 | |
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24 October 2021, 00:54 | #11 | |
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I developed my own little addon board to convert PC floppy drives to Amiga HD floppies. Only need to find the time to convert the 40 or so floppy drives I have... ;-) |
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24 October 2021, 01:12 | #12 | |
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24 October 2021, 07:40 | #13 | |
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But it's planned to become open source at some point, yes. |
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24 October 2021, 21:05 | #14 |
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