Thanks Mike... Not a bad idea, using switches, but Godbout thought about that 23 years ago! ;o) This EconoROM board has 4 banks of chips already, switch selectable. You can have any one or a combination enabled at once, and set the addresses individually. So I could easily use four 2732's or whatever, one for each bank. Though adding further switches would allow even larger chips to be fully used. Joel A. Weder jweder(a)telusplanet.net 403-556-4020