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8.
O->IPL
9.
0010 - The zeros represent capaci-
tor plates that are punched out.
10.
GO and G1 are interrogated.
Local
storage is specified if these posi-
tions are both zero.
11.
This coding allows the R-register
to be set from core if the previous
ROS word gave a read call.
This is
the CM coding used for the
"compute" cycle.
12.
To one
13.
No, the SO and Sl mnemonics are
.both in the CH field.
14.
5
PK, PA, PS, PC, PN
15.
Yes.
When the mnemonic K->W or
CA->W is used.
ANSWERS -- ROS ADDRESSING
1.
Two
2.
8K unit 8064 ROS words
3.
T, driver decode
4.
15
5.
48
6.
120 sense amps, 60 SALs.
7.
A small pluggable card which is
used to satisfy the inputs to the
3
driver decodes for each RCS board.
8.
No, the SALs are shared by each 4K
unit.
Additional sense amplifiers
are needed.
9.
W3
10.
X7
ANSWERS -- ROAR CONTROLS
1.
By means of the AA bit.
I f
the AA
is a one then W3 is set to one.
2.
F, G, H, and
J
3.
CN
4.
0004 (HEX)
6-2.6
5.
False.
The lights are actually
tied to an indicating ROAR.
6.
False.
The A.LU check is further
controlled by the CPU Check switch.
ANSWERS
ROS TIMINGS
1.
e, d, b, a, c
2.
The SALs are set by the .ROS word as
specified by the address in ROAR.
The control register latches con-
tain the data of the previous ROS
word.
3.
The first cycle of a micro program
break-in is called a dead cycle
because no control register latches
are set.
4.
The branch conditions such as
Z
=
0, AC, and 1Be which depend on
a previous RCS word would be lost
due to a program break in.
5.
T4
ANSWERS -- MACHINE CHECK HANDLING
1.
To insure that a second error does
not occur if the failing register
is one which is used in the machine
check microprogram.
2.
By an ALU check
3.
Priority latch off; First machine
check latch on; Suppress malfunc-
tiontrap latch off; Switches not
used to set Wand X.
4.
If H5 is set the error occurred
during a selector RCS request.
If
H6 is set the error occurred during
a multiplexor share request.
5.
A microprogram step that specifies
the D-register as the destination
of the arithmetic statement.
6.
If H1 can be reset by the MC micro-
program, further errors are consid-
ered first errors.
ANSWERS -- FORCED MICROPROGRAM ENTRIES
1 •
00 1 0 (HEX)
2.
Machine reset
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