Table I-2. Signal interrelations

On-Line

]SLCTlN

IERROR

 

1

BUSY )

 

ACKNLG

1 DATA ENTRY 1

 

 

 

 

 

 

 

 

 

 

OFF

HIGH/LOW

LOW

 

 

HIGH

Not generated

Disabled

 

 

 

 

 

 

 

 

 

 

ON

HIGH

HIGH

 

 

LOW/HIGH

Generated after data entry

Enabled

ON

LOW

HIGH

 

 

Same

Same

Enabled (normal entry)

 

 

 

 

 

 

 

 

 

 

<-When SLCT IN is at high level, data entry is enabled, but the input data will be disregarded until SLCT IN is at low level.

Note: ERROR status is assumed to rest only in off-line state, and

the ERROR status does not always mean SLCT IN.

I-4