An unusual 7400-series chip implemented with a gate array
1–10 of 36 posts
Re: An unusual 7400-series chip implemented with a gate array
#2Sort of the opposite of a "we have 7400 series at home" joke.
Re: An unusual 7400-series chip implemented with a gate array
#3Author here if there are any questions...
Re: An unusual 7400-series chip implemented with a gate array
#4> transistors in an orderly matrix (...) forming scattered circuits connected by thin metal wires.
That's [ULA], isn't it? This tech was also known as "Gate Array", before FPGA came along.
Re: An unusual 7400-series chip implemented with a gate array
#5[dead]
Re: An unusual 7400-series chip implemented with a gate array
#6Sort of the opposite of a "we have 7400 series at home" joke.
[dead]
Re: An unusual 7400-series chip implemented with a gate array
#7> transistors in an orderly matrix (...) forming scattered circuits connected by thin metal wires. That's [ULA], isn't it? This tech was also known as "Gate Array", before FPGA came along. [ULA] https://en.wikipedia.org/wiki/Uncommitted_logic_array
Yes, a ULA is another name for a gate array. A while ago I bought an 8086 chip on eBay that turned out to be a random ULA chip that was re-labeled: https://www.righto.com/2020/08/inside-counterfeit-8086-proce...
Re: An unusual 7400-series chip implemented with a gate array
#8> transistors in an orderly matrix (...) forming scattered circuits connected by thin metal wires. That's [ULA], isn't it? This tech was also known as "Gate Array", before FPGA came along. [ULA] https://en.wikipedia.org/wiki/Uncommitted_logic_array
Yes, a ULA is another name for a gate array. A while ago I bought an 8086 chip on eBay that turned out to be a random ULA chip that was re-labeled: https://www.righto.com/2020/08/inside-counterfeit-8086-proce...
From that article:
The book The ZX Spectrum ULA: How to design a microcomputer discusses [...]
Re: An unusual 7400-series chip implemented with a gate array
#9Funny to see this appear online today. I was discussing the real nand2tetris computer built from 74 ICs yesterday with my 8 year old son yesterday:
https://hackaday.io/project/185131-the-hack-computer-from-na...
and now this pops up.
I'm thinking of buying a bunch of 74xx ICs and buttons and led+resistors somewhere and let him mess with them. It's stone age digital tech according to current norms, but I'd rather see him do it with physical components than behind a screen.
Re: An unusual 7400-series chip implemented with a gate array
#10Funny to see this appear online today. I was discussing the real nand2tetris computer built from 74 ICs yesterday with my 8 year old son yesterday: https://hackaday.io/project/185131-the-hack-computer-from-na... and now this pops up. I'm thinking of buying a bunch of 74xx ICs and buttons and led+resistors somewhere and let him mess with them. It's stone age digital tech according to current norms, but I'd rather see…
That's what my dad did. I remember it as confusing, the parts being marked like
SN7424
7411
with one of those numbers being the date code.