3-Bit SR, Parallel Read-in, Diodes out for detecting all 0s in R111 node
<UL>
<LI><b>R220J</b> is a drawing of DEC's R220J.</LI>
<LI><b>R220L</b> is a drawing of DEC's R220L.</LI>
<LI><b>R220X</b> is a 'modernized' R220J.</LI>