Show HN: MacMind – A transformer neural network in HyperCard on a 1989 Macintosh

MacMind is a transformer neural network implemented in HyperCard on a 1989 Macintosh using HyperTalk, with 1,216 parameters. It learns the bit-reversal permutation task through self-attention and backpropagation, demonstrating AI concepts on vintage hardware to demystify modern machine learning.