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Interrupts
Programming
Example
18
Director Status 2
Table 5 lists the meaning of bits set in the A register following a status
request for static operating conditions.
These bits are further defined be-
low.
556 bpi (AO
= 1):
The selected tape unit is set to operate at a density of 556
bits per inch.
800 bpi (A1 = 1 ):
The selected tape unit is set to operate at a density of 800
bits per inch. If bits 0 and 1 of A are "0", the tape is selected to operate at
a density of 200 bits per inch.
Seven Track (A3 =
1):
The selected tape unit is in 7-track mode.
This bit
should always be set when a 608 is selected and never be set when the 609
is selected.
Write Enable (A4
=
1):
The file protect ring is in the supply reel and the
tape has been loaded. Write operations may now be performed.
Interrupts are selected by the Control Function.
They may be cleared by:
1)
Issuing an Interrupt Clear which clears both the interrupt request
and the interrupt.
2)
Re-issuing the interrupt request except for the Alarm interrupt
when the Alarm condition still exists, e.g., end of tape.
3)
Issuing a Clear Controller.
4)
Transferring data in the case of the data interrupt.
5)
Reselecting a unit.
This sample program performs the following:
1)
Connects Equipment 1, Unit 1.
2)
Selects Binary mode, 556 bpi.
3)
Writes a 200-word record of all "l's".
4)
As soon as Busy drops, backspaces one record.
5)
Reads the 200-word record and stores the data in 200 successive
memory locations.
60330800 A
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