poisk1 WIP, displaying magic '3-color' text mode (background, foreground and alternate foreground).
[Linked Image from img-fotki.yandex.ru]

This machine did not have a mc6845 but still managed to emulate most of CGA capabilities. Notably, it did not have a native text mode; when one is set via BIOS call, writes to lower half of video memory cause a NMI and ISR then draws pixels into upper half. Bit 7 in every character cell is magic and selects 'alternate foreground' color for that cell.