https://imapenguin.com/tags/optimization/ Recent content in Optimization on Imapenguin Hugo en-us Thu, 05 Nov 2026 13:15:00 -0500 https://imapenguin.com/2026/11/sha-256-on-a-commodore-64-five-times-faster/ Thu, 05 Nov 2026 13:15:00 -0500 https://imapenguin.com/2026/11/sha-256-on-a-commodore-64-five-times-faster/ Back in 2021 I promised a closer look at SHA-256 on the C64. It turns out the old program got the wrong answer for anything 32 characters or longer. Here’s the fix, and then a version that hashes in 58,514 cycles instead of 328,431.