Hi! I am giving away the remaining uPD7220 GDC prototype boards. If there is anyone interested in working on a 7220 GDC project please let me know. These boards are designed for ECB although will interface to any Z80 quite easily. Other systems would take some work but still possible. Also, there is a page on the N8VEM wiki for the uPD7220 V2 prototype board with schematics, PCB layout, test software, etc. There will be a new board coming out soon but these prototype boards work fine with some very minor tweaks. For more details see here http://groups.google.com/group/n8vem/t/2b566d452dd7b460 Thanks and have a nice day! Andrew Lynch PS, pair this board up with an SBC-188 or your homebrew 8088 board and we could have a completely free/open FreeDOS/OpenGEM solution!