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11.
What affect does the CM field cod-
ing 001 have on storage?
12.
If the four low bits on the Z bus
are zero when the mnemonic LZ->S5,
HZ->S4 is used, how is S5 set?
13.
Can a four way branch be set up
using the status of SO and Sl?
14.
How many parity bits are there?
Name there.
15.
Is the PK bit ever used to maintain
w-register parity?
If it is,
explain.
ROS ADDRESSING
GENERAL INTRODUCTION
•
There are 96 ROS words of 60 bits
each on one ROS board.
•
A 4K module contains 4032 words on
42 ROS boards.
•
•
•
A ROAR (Read Only Add.ress Register)
address selects two ROS words to
read out.
The address in ROAR gates the proper
ROS word to the sense areplifier
latches.
Maximum storage is 8064 words.
A ROS board accomreodates 8 ROS
documents.
Each ROS document contains
12 ROS words of 60 bits each.
The total
number of words on a RCS board is 96.
All words on a ROS board are used.
In a
4K module the addresses are sequential.
Because of the electrical connections on
a ROS board, a ROAR address selects two
ROS words.
However, only one of these
words is gated to the sense amplifier
latches.
Since there are 96 words on a
ROS board and two words are addressed at
a given time, 48 drivers are needed to
read out the 96 words.
3-53
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