My attempt to use 8bit ISA graphics with Arduino Mega. The real goal is to use this with either 6502 (extra register will be needed to keep segment part of the address) or with Z180 (which has 19 address lines).

This work is based on an earlier attempt: http://www.tinyvga.com/avr-isa-vga

What I did basically was to simplify the code and fix some bugs (there was one nasty bug related to font loading).

Sharing as this may be of interest to people interested in retro computing or building their own SBC.