First post, by rasteri
I decided to take a deep dive into the EGA capabilities of my Amstrad PC1640.
Had lots of fun along the way - built a circuit to convert CGA/EGA to analog for the GBS-8200, using an EEPROM for the encoding logic (got the idea from the IBM5154 service manual).
Also got EGA hi-res mode working on the GBS-8200 using gbs-control.
Also did some investigating of the weird 64-color mode used on Rambo 3 and Ironman Super Offroad.
Also found time to stick a VGA card in there and play with dual monitor support.
Full video is here -