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Operation
RBD
READ BACKWARD DECIMAL.
RBB
READ BACKWARD BINARY.
RWD
REWIND.
WEF
WRITE END-OF-FILE.
BKW
BACKSPACE AND POSITION WRITE HEAD.
Octal Code
OTOlOP
4MMMMM
TNNNNN
Decimal information is read from tape moving
backwards. A maximum of N words is read into
memory, the first word being placed in location
M.
The second word is placed in
M - 1
and so
on until N words are read.
The tape controller
alters the zone bits of characters read so that
they conform to GE Compatibles/200 internal
BCD characters.
OT030P
5MMMMM
TNNNNN
Information is read from tape moving backwards.
Contents of bit positions 2- 19 of each word read
are placed in memory exactly as on tape (zone
bits are not altered).
A
maximum of N words is
read into memory, the first word being placed
in M.
The second word read is placed in
M -1
and so forth until N words are read.
OT020P
000000
TOOOOO
Rewind tape handler T to leader.
OTOOOP
200000
TOOOOO
The end-of-file character (0001111) and end-of-
file gap are written on tape by tape handler T.
OTOlOP
600000
TOOOOO
The tape on tape handler T is backspaced one
record and the write head is positioned to write.
[ID&1J&~~1J~ ~@------------
V-47
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