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TOP 1 , 3 , - · - - - - - - - - - - - 79
BOTTOM 2, 4, •
•
~
P1
000
000
System/CPU Overview
1 , 3 , - · - - - - - - · 79
~~-
-~
SKIP AND SPECIAL
FIELD PCA
30003-60022
--[!D-
M
• S
J1
J2
J3
TOP 2,4, •
• 50
BOTTOM
1,3.---- - - - - - .
49
2,4, •
I
50
1,3.--·-----· 49
2,4, •
• 50
1,3,--'- - - - - - , 49
Figure 2-22.
SSF PCA Jumper Locations
2-132.
S-BUS PCA.
The S-Bus PCA contains three selector switch-
es (Sl, S2, and S3) as shown in figure 2-23.
Set
switch
S3
to
match the computer system's Main Memory size.
Switches Sl and S2
are used for memory interleaving.
At present, memory
interleav-
ing
is not factory supported and sw itches Sl and S2 must be con-
figured for non-interleaving in accordance with table 2-8.
Memory interleaving requires two Memory Control and Logging PCA's
be installed in the system, each supporting
one,
two,
or
four
Semiconductor
Memory
Array PCA's.
The memory sizes that can be
interleaved are limited to 256K, 512K, and l024K words.
The
re-
quired switch
configurations of switches Sl and S2 on the S-Bus,
lOP, and Selector Channel Register PCA's for memory
interleaving
are listed in table 2-8.
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