We have the great pleasure of announcing the availability of the NitrOS-9 V3.3.0 release. NitrOS-9 is an open-source operating system for 6809-based computers (Dragon and TRS-80/Tandy Color Computers in particular), and is compatible with OS-9 from MicroWare.
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Sinclair ZX80 playing Space Invaders at VCF 2010
Here is a video of a real Sinclair ZX80 computer playing Space Invaders at the Vintage Computer Festival 2010 at Bletchley Park. You can see that the screen does not flicker when a key is pressed.