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| Macintosh Portable SRAM card: Schematics available? |
Posted by: Gorgonops on 2020-05-16 08:00:24
Yay! GALs are truly magical.
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Posted by: LaPorta on 2020-05-16 08:27:33
It works! Truly
amazing to me who has no knowledge of how any of this works whatsoever!
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Posted by: Stephen_Usher on 2020-05-16 09:16:09
It's mostly electronic logic Lego really.
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Posted by: Stephen_Usher on 2020-05-16 09:20:06
Yay! GALs are truly magical. Indeed, but most of the heavy lifting is being done by the 74HC154 to be honest. The GAL is just doing bus arbitration/flow control.
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Posted by: LaPorta on 2020-05-16 09:52:24
No matter how it works, you guys are amazing. Where did you learn all this stuff? What sort of degrees do you have?
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Posted by: Stephen_Usher on 2020-05-16 10:33:29
I just picked it up over the years. Most of it actually in the last few fixing old computers and reading up on-line, helped by Google.
My first degree is in Geology. ;-)
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Posted by: Gorgonops on 2020-05-16 12:11:26
Indeed, but most of the heavy lifting is being done by the 74HC154 to be honest. The GAL is just doing bus arbitration/flow control. That's the important part. Isn't the GAL's fault that this board has that ridonkulous number of RAM chips. If you had fewer larger ones it'd do the job all by itself.
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Posted by: trag on 2020-05-16 21:01:49
Very nice work. Congratulations.
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Posted by: Gorgonops on 2020-05-18 17:33:40
Where did you learn all this stuff? What sort of degrees do you have? I had one of those Radio Shack Science Fair 150-in-1 things with the springs when I was a kid, that's probably my most relevant qualification.
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