Someone was looking for the ET-3400 ROM adapter, See http://www.swtpc.com/mholley/ROM_Emulator/UsersGuide.pdf Be careful, it looks like pin 11 (CS1) has been masked to be active low, so use the spare gate on the 7420 as an inverter. --------------------------------- Ahhh...imagining that irresistible "new car" smell? Check outnew cars at Yahoo! Autos.