BBC Micro bot runs your tweet on an 8-bit computer emulator. Below is output from 1000 programs that different users submitted to the bot.
The tweet sized programs are written in BBC BASIC (1981) a very fast implementation of the language by Sophie Wilson who later created the ARM architecture.
To squeeze under the 280 character limit techniques include abbreviations, bytes tokens, base2048 encoding, and even inline 6502 machine code.
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