Control Data Corporation 6000 Series Reference Manual page 17

TABLE 3-2. 6675-COMPUTER COMMUNICATION SIGNALS (Figure 2-2)
SIGNAL DESCRIPTION
External Master Clear A static
11
1
11
appears on the line whenever the 6600 dead-
start panel is used to start the system.
Function
Inactive (from 6675)
Active (from 6675)
Active (from DCA)
Inactive (from DCA)
Full (from DCA)
Full (from 6675)
Empty (from DCA)
Empty (from 6675)
A static
"1"
signal is produced on the line when an external
function code is present on the data lines for examination
and translation by the 6675. An Inactive signal from the
6675 removes the static
11
1
11
signal.
A static
11
1
11
signal is produced on the line as a response to
an EXF request if the 6675 is selected.
A static
11
1
11
signal is produced on the line as a response to
an Active (from DCA) if the 6675 is selected. This is
cleared by an Inactive from the DCA.
A static
"1"
signal is produced by the data channel while it
is activated.
A static
"1"
signal from the DCA indicates that the computer
has deactivated the data channel.
A static
"1"
signal accompanies each word of output infor-
mation. Signal indicates output data present on lines. The
signal is turned off by an Empty from the 6675.
A static
11
1
11
signal is produced by 6675 when a data or status
word is available. The signal is turned off by an Empty
from the DCA.
A static
11
1
11
signal indicates that the DCA has accepted the
input word from the 6675. The signal is turned off by
dropping the Full in the 6675.
A static
"1"
signal indicates that the 6675 has accepted the
output word from the DCA. This signal is turned off by
dropping the Full signal in the DCA.
3-4
Rev. A