This is pretty much a complete set for a 620i I have a copy of Vol 1 of the maint manual, which doesn't incl the schems. DM 103 matrix decoder 104 memory driver 106 memory timing & ctl 108 register card 109 processor control 1 110 processor control 2 111 processor control 3 112 processor control 4 113 teletype control 119 memory data card 120 ? 121 interrrupt trap 122 mul/div extd adr 123 pwr fail /restart 124 pri intr module 126 ? the name of the card should be on the etch