eepromlogic
Hardware
programmable logic
SHOW HN2023
22points
15comments
#1,608of 3,109 in 2023
Top 52%of 2023 by points
How HN took it
CuriousMostly questions and neutral comments
0 positive, 4 neutral or asking, 0 mixed, 1 critical, out of 5 comments about the project. Thread score -0.08.
Idea: 0 for, 1 against
The thread, comment by comment
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positive neutral or mixed critical about another commenter or something else the maker
What HN said
What people liked
Clever approach and useful for complex logic with many inputs.
From 2 comments
This was routinely done for 2 decades or so. Small (e.g. 32x8, 256x8) fast bipolar proms were extremely common for things like address decoders in the 70s and 80s. I've used fast…
kjs3 on HNDefinitely, if you just need some nand gates, this is probably the worst way of doing it, where it can be of some use is when you want to describe more complex behavior, where…
dusted on HN
Objections
Slow compared to discrete gates; EEPROM access time limits speed.
From 1 comment
Yes, however, it's best suited for the complex parts (logic that needs a lot of inputs and few outputs) due to the fact that the eeproms it generates data for are arranged as 8…
dusted on HN
Simpler to use plain NAND gates for basic logic.
From 1 comment
It can function as a NAND gate, and anything can be built out of NAND gates. At that point it might be simpler to just use actual NAND gates though :)
royjacobs on HN
Questions
Could it be used to build a minimal Ben Eater style CPU?
From 1 comment
Could this be used to build a super minimalistic Ben Eater style CPU?
c7DJTLrn on HN
Alternatives named
PLA or GAL devices
From 1 comment
Yes, however, it's best suited for the complex parts (logic that needs a lot of inputs and few outputs) due to the fact that the eeproms it generates data for are arranged as 8…
dusted on HN
RAM as programmable logic
From 1 comment
Another interesting strategy is to use RAM as programmable logic. It's faster, which can be beneficial in some situations, and is obviously easy to change on the fly. The catch…
pomatic on HN
Registered PROMs and fast bipolar PROMs
From 1 comment
This was routinely done for 2 decades or so. Small (e.g. 32x8, 256x8) fast bipolar proms were extremely common for things like address decoders in the 70s and 80s. I've used fast…
kjs3 on HN