Input Bus Gate, 6 Gates, 1 Independent Input, 1 Paired Common Input
<UL>
<LI><b>R123A</b> is a drawing of DEC's R123A.</LI>
<LI><b>R123B</b> is a drawing of DEC's R123B.</LI>
<LI><b>R123X</b> is a 'modernized' R123.</LI>