Table 3.3: Controls 
Control  Type  10to2  PRCB  2to10  Description 
READER SELECT  2pos. toggle 
up  down  up / down 
Must be set to the according base2 or base10 reader before read operations.

IBM CARD READ  2pos. toggle 
up  down  down 
Enables detection of the sign of the coefficients from the base10 reader. 
ENABLE OUTPUT 10  2pos. toggle 
down  down  up 
Enables the base10 display. 
BANK  six 2pos. toggles 
up / down   down 
During a base10 read operation, these switches select which one of six banks on CA will receive the 5 coefficients from the base10 card. 
SIGN CHANGE  plug & 30 jacks 
OFF  130  130 
Selects which coefficient to eliminate during PRCB operations, and which coefficient to convert during 2to10 operations. 
ZERO DETECT  plug & 30 jacks 
OFF  130  130 
These are used in a manner identical to the SIGN CHANGE plug and jacks. 
READ 10  push 
*   * 
Read contents of base10 card, converted to base2, into selected bank of CA. Also used to start a 2to10 conversion operation. 
CLEAR base10 display  push 
  * 
Clear the base10 display. 
GO  push 
 *  
Perform paircombining (elimination) operation. 
ADD/SUB  push 
 *  * 
Selects the initial add or subtract mode for PRCB and 2to10 operations. For PRCB, if the signs of the selected coefficient are the same on the CA and KA drums, the initial mode should be set to SUB; if they differ, to ADD. For 2to10, if the sign of the selected coefficient is positive, the initial mode should be set to SUB; if negative, to ADD. 
READ 2  push 
 *  * 
Read contents of a base2 card into CA. 
PUNCH 2  push 
*  *  
Punch contents of CA onto a base2 card. 
TRANSFER CA TO KA  push 
 *  
Copy the contents of CA to KA. 
CLEAR CA  push 
*   
Clear the contents of CA. 
CLEAR KA  push 
  
Clear the contents of KA. 