Toots for cnlohr@chaos.social account

Written by cnlohr on 2025-01-20 at 03:04

Did I just find a new math? 3 integer subtracts, 1 integer add, and two shifts, gives you a sin and a cos? Not even a multiply. Surely this already has a name. If not, do I get to name it?

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Written by cnlohr on 2025-01-18 at 08:02

I have recently discovered there are multiple chips where they realized sequential program counters were less space efficient than LFSR's. So they step through ROMs in pseudorandom order, and it works out better.

https://www.righto.com/2024/12/this-die-photo-of-pentium-shows.html

https://www.righto.com/2021/12/reverse-engineering-tiny-1980s-chip.html

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Written by cnlohr on 2024-12-31 at 00:17

I feel like we've failed as a country that we can't find and elect more people like Jimmy Carter.

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Written by cnlohr on 2024-12-26 at 11:10

This library is still very work-in-progress, but it's what I'm using in another project, and indeed it is able to eek out between 1-5% improved overall compression compared to huffman coding, in almost all the cases I've been able to find. More importantly in many cases sometimes it's easier to use!

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Written by cnlohr on 2024-12-26 at 09:53

About 6 months ago, Lyuma2D told me about Arithmetic coding, saying it was "Better than Huffman" which I laughed at, because, Huffman is provably optimal (but only for symbols). Boy was I wrong. I extracted VPX (VP8/9) coding into a single-file library https://github.com/cnlohr/vpxcoding

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Written by cnlohr on 2024-12-17 at 21:08

I couldn't help but to play with these 21¢ LCDs on the 10¢ #riscv #ch32v003. Adding touch, LCD outputs USB to a processor that has none of them, and without a USB connector! Join me on this little side quest. https://www.youtube.com/watch?v=KNDRUWlsu0k

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Written by cnlohr on 2024-12-16 at 20:05

Reading the Wi-Fi 8 "we focus on reliability" but "having several access points is critical because it is line-of-sight only" has me like

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