Description
The IBM Type 77 (or 077) Collator (left), introduced in 1937 for the Social Security contract, reads two decks of cards from its two input hoppers and sends the cards to any of five output bins based on comparison of the two input cards and the plugboard program. Each card feed reads 240 cards per minute, thus the total speed is 480 cards per minute for two feeds. The Type 77 rented for $80 per month in 1955.
