[vintermann]

Reminds me of the printer interrupt hack Darklite/Offence used for their Tiki-100 demos.

The Tiki-100 is an obscure Norwegian 8-bit computer from 1984, also Z80-based. It had nice graphics for its time, with 16 colours from a 256-colour palette. However, it was very hard to use productively, since the machine had no video sync interrupts.

What the guys in the demogroups figured out, was that it did have parallel port interrupts, and with a tiny hardware mod (just a wire from the expansion port to the parallel port), they could "steal" those for Commodore 64-style raster interrupts.

[actionfromafar]

Heck, one could connect a Commodore 64 to the Tiki and get synced frames.