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T4
~
P4
r-;;:-
Mach Chk Reset
I()
N
Reset Mach Check
I
R
D
L -
Gate MC Reg to A Bus
~
,--- A Bus 7 Bit
r-L-r-~
MC7
r---
r-
-FL-
MC 0-6
1
To Indicator Lights
'""()
R
' - -
Any Machine Check
ChkSW
~
to Proc
2nd Error Stop
r-;;:-
Jst Mach Chk
T4
Hard Stop
o
~R
I-FL-
Chk Stop Sw
Clock Start
.. ALU Check
Additional {~==
Set Lines
\ -
Reset
{===~
Lines -
o
W or X Reg ister
f - - - - ,
~
,---
r--;;:-
Inputs
L..-
f----
N I - -
f-------'----+------I--PH-
~C_he~c~k_S~t~op
______
~
~
Figure 2-33.
ALU check Stop Controls
REVIE~
QUESTICNS - ARITHMETIC CPERATICN
1.
Data to ALU is supplied from
2.
ALU lines are
bits wide.
3.
The control of data moving through
ALU is by
4.
List the four basic ALU operations.
5.
Data can be gated to ALU from the
A-register six ways.
Name each.
6.
Data can be gated to ALU from the
B-register three ways.
Name each.
To Indicators
for WX Registers
I--PH-
1 - - - - - .
I--PH-
7.
The
6 on every
circuit, adds
operation.
8.
A decision to subtract six is
caused by
9.
Parity is checked by a special
circuit in ALU.
(True/False)
10.
The Carry Latch is position
_____ of the
register.
11.
What two latches must be
se~
to
carry into position seven of"ALU?
2-21
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