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no new Control Function is received from the computer, tape motion stops.
A Write is rejected if Not Ready or Write Motion has not been initiated.
Control Function: The Control Function operation specifies operating con-
ditions for the selected controller and transport and initiates tape motion.
To perform a Control Function, load
Q
with W
=
00, E
=
equipment number,
and D
=
01. Load A ac<;!ording to Figure 6 and Table 3.
Execute an Output
from A.
The controller rejects control functions if it is Not Ready, the End of Opera-
tion status condition is not present, an illegal code exists in bits
7-10
of A,or
if the tape transport is Busy and Rewind or Rewind Unload function is selected.
Table 3 lists the legal motion control codes. One motion control plus any or
all clears and interrupt selections may be selected simultaneously or in-
dividually.
The requests are honored in this order: clears, interrupt selec-
tions, motion control.
The following describes these codes:
1)
Clear Controller (AO
=
1) -
directs the clearing of all interrupts,
interrupt selections, errors, and File Mark/Tape Mark status. All
other select codes coded with it will also be honored. For example,
A
=
0011 would clear the controller and the select interrupt on end of
operation.
2)
Clear Interrupt (AI
= 1) -
clears all interrupts and interrupt re-
quests.
If
an interrupt request is coded along with a Clear Interrupt,
that selection is honored, but any previous selections are cleared.
3)
Data Interrupt Request (A2
= 1) -
causes an interrupt to be gener-
ated when an information transfer may occur.
The interrupt re-
sponse is cleared by the Reply to the data transfer.
The request
and response are cleared by a Clear Controller or a Clear Interrupt
code.
4)
End of Operation Interrupt Request (A3
= 1) -
causes an interrupt to
be generated at the end of an operation.
The request and response'
are cleared by a Clear Controller or a Clear Interrupt code.
5)
Alarm Interrupt Request (A4
=
1) -
causes an interrupt to be gener-
ated upon a condition which warrants program or operator attention.
The Alarm interrupt is generated by any of the following conditions:
a)
End of tape
b)
Parity error
c)
Lost data
12
60330800 A
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