General Category > LisaList2
Sun Remarketing SCSI Card Reverse-Engineering
AlexTheCat123:
--- Quote ---You think you can probably replicate that same logic with a couple of GALs and some buffers
--- End quote ---
That's what I'm thinking about trying next, assuming it's allowed on the forum! You can find NCR 5380 chips on eBay for around $9.00, so sourcing those shouldn't be an issue.
I'm considering using a GAL from Atmel/Microchip because they seem to be the only company that's still making them, but I'm having some real trouble with their WinCUPL software suite for writing the GAL equations and simulating the results. It hasn't been updated since 2003 and fails to compile my code no matter what I try and doesn't give me any sort of explanation as to what the problem is. Does anyone know of a different piece of software that I could use to write and simulate the GAL equations? The only other free option that I can find is some ancient DOS program from the early 1990s, which is less than optimal.
rayarachelian:
--- Quote from: stepleton on February 07, 2022, 06:28:24 pm ---I hope I won't cause offence with the following --- it's not intended!
--- End quote ---
None implied, nor any detected.
--- Quote from: stepleton on February 07, 2022, 06:28:24 pm ---I can understand misgivings about copying the PCB net (regardless of legality, which I think permits it for the reasons Patrick said, although I'm no lawyer!). I don't think this is plagiarism: Alex is not trying to say that the card is their own invention.
But if reverse-engineering and copying the net isn't fair play for other reasons, then we can abide by that, especially on this forum. Suppose instead you identified the "theory of operation" of the card and built some kind of replacement that MacWorks could use in the same way --- would this be all right?
--- End quote ---
There is already precedent: the Sapient Lisa motherboard, I/O board, CPU board, and Quad Port serial Card (Tecmar) all have been duplicated from the Apple (and Tecmar) originals, and as far as I know, this was done without the express permission of Apple (or Tecmar).
Further, the LisaDAC (sound) board has also been replicated, but this one had permission from the original designer.
On top of the original designs, many changes were made, so these new boards aren't just direct duplicates of the originals, but have been improved in several ways. This is the way of progress.
blusnowkitty:
--- Quote from: AlexTheCat123 on February 07, 2022, 08:03:05 pm ---I'm considering using a GAL from Atmel/Microchip because they seem to be the only company that's still making them, but I'm having some real trouble with their WinCUPL software suite for writing the GAL equations and simulating the results. It hasn't been updated since 2003 and fails to compile my code no matter what I try and doesn't give me any sort of explanation as to what the problem is.
--- End quote ---
Well the WinCUPL product brief ( https://ww1.microchip.com/downloads/en/DeviceDoc/DOC0434.PDF ) says its minimum requirements are a 486 running Windows 95. Spin up a VM with 95 and see if it does what you need.
AlexTheCat123:
--- Quote ---Well the WinCUPL product brief ( https://ww1.microchip.com/downloads/en/DeviceDoc/DOC0434.PDF ) says its minimum requirements are a 486 running Windows 95. Spin up a VM with 95 and see if it does what you need.
--- End quote ---
I tried running it in a 95 VM and on actual hardware under 95, 98SE, and 2000, and still got the same problem.
rayarachelian:
Might this help: https://sourceforge.net/projects/cupl-ide/files/ ?
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