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Re: [N8VEM-S100:1957] Programming GAL's
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- Subject: Re: [N8VEM-S100:1957] Programming GAL's
- From: David Riley <frave...@gmail.com>
- Date: Wed, 9 Oct 2013 12:43:41 -0400
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On Oct 9, 2013, at 12:19 PM, monahanz <mon...@vitasoft.org> wrote:
> For programming them I would prefer not to use a high level language (the logic is simple, few chips). I was thinking of using something like PALASM. Could somebody direct me to a DOS/Windows version that I could get a run-time version. I see many references/write-ups but no actual run-time code.
PALASM is a great choice. It gives you very direct control over what's going into your chips; for something the size of a GAL, that's vital (and a higher-level language is generally massive overkill). Lattice's ISPlever at least used to be a great choice; I think you can still download (for free) a version that'll make GAL bitfiles. That's what I used last time I had to make a GAL file for a vintage board that needed a replacement PAL.
I think I might have source lying around on my hard drive for an open-source GAL-compatible PALASM workalike that I found online as well, but I wouldn't swear to it.
Worst case, the GAL datasheets detail exactly what bits do what, so you could always handcraft your bitfiles. That's a LOT of bits, though, and a lot of minterms to figure out if you have complex equations, so it's much nicer to let PALASM do the heavy lifting on that.
As far as programming them, I use my EPROM burner. There may be other simple homebrew ways (I think I have documentation on the programming algorithm as well, which was devilishly hard to find last I looked), but I don't know them off the top of my head. If anyone needs a part programmed, I'll be glad to do that if you send me parts (or money to buy them) and a bitfile.