Awesome, thanks for your help! This is a really fun learning experience. I thought something about this board seemed funny. Luckily I picked up a bunch of sports games for <$1 each to play with this.
So for my clarification, I should be able to use this board with 27C400 (40-pin 512KB) but not 27C800 (42-pin 1MB) EPROMs? Or will either be fine?