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0
2
3
4
5
6
7
8
9
A
B
c
D
E
F
ox
The PC area of auxiliary storage is used
ox
for two purposes:
1X
PUNCH CHECK/PFR
1X
1.
The column form of the data read at the PF R brushes
READ
2X
is placed in PC during a read command to the punch
2X
with PFR. In this case, PC has the same format as RO
3X
and is in auxiliary storage positions 4x00 through 4x9F.
3X
PC can be used for the column form of the PFR read
data because on a read command to the punch, cards are
l
F
G
4X
4X
not fed and PC is not needed for punch-image checking
5X
purposes then.
5X
6X
2.
The punch image form of the preceding record sent to be
BX
7X
punched is in PC during a write command. The PFR punch
image is ORed with the punch image form if a PFR
7X
write command is used. In this case, the PC area is com-
ax
prised of auxiliary storage positions 4xOC through
ax
4x83.
9X
9X
AX
AX
BX
BX
ex
READER ROW IMAGE
ex
DX
DX
EX
EX
FX
FX
0
2
3
4
5
6
7
8
9
A
B
c
D
E
F
Figure 1-12. Awciliary Storage Module 4
2025 FEMM (7/69)
1-11
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