Originally Posted by shattered
When firmware thinks there is a graphics card, a Tek 4010 mode menu suddenly appears:

[Linked Image from img-fotki.yandex.ru]

Graphic card is rather simple -- basically a "glass plotter" (no upd7220 there, it's all discrete chips).

... and it seems to work (haven't understood it fully yet, so there are stray pixels):

[Linked Image from img-fotki.yandex.ru]