Palette and Vsync statements are in place now.

I had modest successes with freeware games PACMAN, DOODLE and SCRAM (the last one displays a monochrome intro pic with too much space in between).

Text seems totally broken (right to left). Guess "hgdc_draw_text" must be implemented, first eek

[Linked Image from]

Could someone have a look at the offsets in "vram_w" and "hgdc_display_pixels", please?

Without schematics or intimate knowledge of the 7220, it seems too much trial & error (i do not even own the hardware).

Perhaps there a circuit diagram of the Rainbow-100 graphics option (part number should be 54-15688 or PC1XX-BA)...?

Last edited by Bavarese; 09/19/16 06:35 PM.