Signal Cable Conn., 19 wire ribbon, D, E, H, K, M, P, S, T, V hot, 10 grounds: C, F, J, L, N, R, U
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<LI><b>W021A</b> is a drawing of DEC's W021A.</LI>
<LI><b>W021B</b> is a drawing of DEC's W021B.</LI>
<LI><b>W021X</b> is a 'modernized' W021.</LI>