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Exercise - RCA Spectra 70 Training Manual

System
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Table of Contents
Exercise:
T
F L A I l I/o OPERATrONS overlap other
operations in the 70/25.
T
F
2.
All r/o instructions are two address (6
byte) format.
T
F
3.
On the 70/25 one to eight r/o channels
are available.
T
F
4.
If an r/o device is busy when an r/o
instruction using that device is at-
tempted, a hold off will occur and the
instruction will be restaticized until the
device becomes available.
T
F
5.
After an r/o instruction is performed,
a Condition Code setting of 3 indicates
rnterrupt pending.
T
F
6.
The direction of operation for all r/o
instructions is from left to right.
T
F
7.
The instruction that tests for an error
condition after an r/o instruction is the
POST STATUS instruction.
T
F
8.
Unless inhibited an interrupt takes
place after each r/o command.
T
F
9.
The purpose of r/o termination inter-
rupt is to transfer the Standard Device
Byte into HSM.
T
F 10.
A Post Status Command will terminate,
and control will be passed to the next
T
57
instruction if the channel addressed is
busy.
F 11.
If a device is inoperable, and a read
orwrite is directed to it, the Secondary
Indicator of the Standard Device Byte
is set and int-errupt takes place.
12.
What are some ofthe uses of the WRITE
CONTROL instruction?
13.
What are the formats of the 70/25 I/O
instructions?
14.
What does the Sl field contain in an
1/
a
instruction?
15.
Write a Read Forward and a Read Re-
verse instruction which will read data
from trunk #2, unit #2, into the area
0100-0110.
16.
Write the necessary instructions to:
a.
Read a Card
b.
Punch a Card
c.
Write a message to the console
typewriter.
d.
Read a message from magnetic
tape.
Include the sensing, the condition code,
POST STATUS, I/O SENSE, for each
operation.

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Spectra 70/25