Standard Digital Board Retro Kit for 54000 & 54001 ("phone plug" type connection for topside panel).

Replaces 2000DR1C, 2000DR2B, 50975, 510ER1A, 51408, 51511, 51545, 51789, 520ER1C, 52518, 53150, 54122, AC100R1A, APS100R2A, B240DGR2A, B240DGR2B, B240DGR2D, C3000R1C, C3000R1D, C4000R1A, DAK100R1A, DAK100R1B, DS100R1C, DS34R2A, DS34R2B, DS4R3C, FW150R1B, H150R2A, H150R2C, HS100R1A, JET100R1A, L101R1B, LB104R1B, LB104R1C, LB104R1D, LB104R1E, M2/M3R1D, MAJ200R1B, MAJ200R1D, MAS300R1F, Q1043R2A, SAR200R2A, SCS100R1A, SS3000R1A, WS200R1A, ZX2000R2A, ZX2000R2B, BAL52518, 611313, 9710-07.