IBM System/360 2050 Maintenance Manual page 120

Processing unit
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s
0 1 Abbreviation
Nome
D_!ij_t 4-D.!i!t 5
D.!i!n 6,7,8 9
Comments
+81
T"l'e Control 1
Tope unit
Operation:
If position
S
is not 0, address
of
-81
TR"
(0-9)
I.
Read
first
ROW.
TRR*
2. Read p•• RM
TW*
3, Write
TWR*
4. Write per RM
TWZ*
S.
Write with zero elimination
TWC*
6. Write per RM and zero
elimination
TSF*
7. Segment forwordspace per
count
TSB*
8. Segment backspace per
count
TRA', ••
9. Read all alpha
0. Operotion in position 9
TSEL
+
Priority
O. No-op select
TM*
-No Priority
1 • Write tape mark
TRW
2, Rewind
TRU
3, Rewind/unload
TRB
4. Backspace
TSM*
5. Write tape segment mark
TSK
6. Sk;p
TEF
7. Tu•noff EOF
TSLD
8. Set low density
TSHfl
9. Set high density
*Moy
set a stocking latch
**Moy
be
treated
0$
a Read
+82
Some
01 •
81
-82 except other
+83 sync is used
+84
-84
Note: All other 7070
1
74
operation codes are unem...ilated.
FIGURE 111. EMULATED 7070;74 OPERATION CODES (PART 4 OF 4)
Service Checks, Adjustment and Removal Procedures
(3/71)
119

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