Variable Clock, 30CPS to 2 MC
<UL>
<LI><b>R401D</b> is a drawing of DEC's R401D.</LI>
<LI><b>R401F</b> is a drawing of DEC's R401F.</LI>
<LI><b>R401H</b> is a drawing of DEC's R401H.</LI>
<LI><b>R401X</b> is a 'modernized' R401.</LI>