IBM System/370 Manual page 148

A register contains processor
storage address bits S - 21
of the data in the
corresponding buffer block.
Four blocks per column;
bits 21 - 26 of the processor
storage address determine
the column.
512 blocks
per column.
Figure 10.15.4.
22
Address Array
o
14-bit
)
address
14-bit
address
14-bit
address
2
14-bit
)
address
3
\
Column 0
Block
Buffer Storage - SK
I
I
o
32 bytes
}
32 bytes
32 bytes
1
,
~
2
3
32 bytes
J
f
\
Column 0
Processor Storage - 1024K
Siock
I
\
o )
1
)
''''''-..
.---..
\
-
,
--
-
-
7
~
I
51 0
)
51 1
-
...,
l,;Olumn u
.
8K buffer organization
63
63
63
256 Block
Address
Registers
256 Blocks
Addresses 0 - 2047
Addresses 2048 - 4096