Located in card slot 1 of the Basic and Enhanced 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.

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

 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