A Bulletin Board Service (BBS) has been successfully hosted on a Casio VX-4 calculator. The developer has created four software applications for the Casio Pocket Computer calculators, with one already published on GitHub and the others planned for open source release.

os8088 1.0 is a graphical operating system designed for the IBM PC/XT, featuring a Macintosh System 1-style desktop. It supports overlapping windows, pull-down menus, pre-emptive multitasking for up to 12 tasks, and operates in various display modes including VGA with 16 colors at 640x480 resolution.

The Wizard's Castle is an 80s microcomputer BASIC game originally written for the Exidy Sorcerer platform. The source code includes a comment line that features a seemingly nonsensical string, which appears verbatim from the original code.

A transformer model with approximately 25,000 parameters is implemented on an unmodified Commodore 64, utilizing hand-written 6502/6510 assembly. This 2-layer decoder-only architecture features real multi-head causal self-attention, softmax, and RMSNorm, and can be loaded from a floppy disk.