Version 5 Breadboard VGA video character RAM and video RAM

A project log for Nanocomp 6809 8 Bit Retro Computer on Breadboards

Wireless World Magazine in January and June 1981 published this design. Reproduced on solderless breadboards using the original Monitor ROM

dave-henryDave Henry 12/02/2022 at 22:020 Comments

Further updates to add configurable character RAM which allows fonts to by dynamically loaded and character raster images to be redefined for custom graphics shown below for a VGA 8x16 font.

Example image of the VGA characters in the default font

This is then extended in video 4 where the video RAM is added to allow up to 30 rows and 80 characters with hard coded foreground and background colours (later stages will add upto 256 colours from 262K palette).

Example image from 20" LCD Monitor

Future updates to include 16 Colours foreground/background by character, 640x480 2 colour graphics and 320x200 256 colour graphics.