Located in card slot 1 of the early Basic Operator Station, this card interfaces the station’s keyboard with the station’s data bus lines, and has the terminating resistors for the data, address, and control buses. This version of the card is used only on the obsolete rel 110 operator stations.

Older keyboards derive power from this card, routed through fuses F1 and F2. The most recent version of this card is the 30750990-002.

F1 – 1.5 amp +5V logic power F2 – 1.6 amp +5V lamp power

Jumpers

A-B-C Number of keylocks B-C Normal – one keylock A-B Optional – two keylocks in use

D-E-F Origin of keylock signal D-E Normal – From TB-9 E-F Obsolete – From J5 (Rel 110 keybd)

G-H-J Parity selection from group keyboard H-J Normal – No parity bit G-H Unused – Parity bit enabled

K-L-M Parity selection from standard keyboard L-M Normal – No parity bit K-L Unused – Parity bit enabled.