IBM System/360 20 User Manual

r-,
• Inspect bit 1 (intervention
~eguired). If this bit is on, the
tape drive addressed is not
attached to the control unit.
• Display location D 1 (sense by te 1).
• Inspect bi t 7 (not capable). If
this bit is on, an attempt has been
made to read, on a tape drive (one
of the Models 4 th~ough 6) without
the NRZI compatibility feature, a
tape w~itten in the NRZI mode.
• Display location DO (sense byte 0).
• Inspect bit 4 (data check). If
this bit is on, a w~ite e~ror has
occu~red.
• If bits 1 and 4 were found to be
off, inspect bit 2 (bus-out check).
If this bit is on, a bus-out check
(not corrected after 3 repeated
attempts) has occurred. This is a
channel hardware failu~e, which
should be analyzed by an IBM cus-
tomer engineer. Fo~ further
identification, location 9D (unit
status) may be displayed to find
out whether the error occurred dur-
ing initial selection or during
data transfer.
• If bit 2 of sense byte 0 is also
off, bit 0 (command reject) must be
on. Display locations AO and A1 to
find the address of the CCW. Dis-
play the fi~st byte of the CCW,
which contains the command code.
If the command code is 01 (write),
1F (write tapema~k),.or 17 (erase),
an attempt has been made to write
on, o~ erase, a file-p~otected tape
volume. In this case, 1::i t 6 in
loca tion D 1 (file-protected) is
also on.
• If the command code is not 01, 1F,
or 17, an attempt has been made to
set a tape control unit with 7-
track compatibility feature to
"data conve~te~ on" although the
unit does not have the data conve~
sion featu~e.
If the er~or condition cannot be
corrected ~anually, the job must be
discontinued. Press the start key on
the CPU console to initiate the end-
of-job routine.
If the condition has been cor~ected or
another repeti tion sequence is
desired, manually enter into location
CE (operator-communication byte) any
non-zero binary value and press the
start key on the CPU console to resume
operation.
\49\. Display general register 13, which
L __ J contains the displacement of the
symbolic device address that was
not assigned or misassigned, coun-
ted from the beginning of the log-
ical unit table in the Basic
Monitor.
r-,
• Display general register 15, which
contains the address of the command
control block.
• Give this information to the pro-
grammer to enable him to correct
the program.
• Discontinlle the job by pressing the
start key on the CPU console. This
initiates the end-of-job routine.
1501. Display location 9C, which contains
L __ J the address of the tape drive
r--,
concerned.
• Put this drive into ready status.
• Press the start key on the CPU con-
sole to continue processing.
\51\. Correct the erro~ condition and re-
L--J initiate the system run, beginning
with the IPL procedu~e.
r--,
1521 a) The incor~ect card was read on a
L--J 2501 or a 2520 card Bead-Punch.
• Remove the input deck from the
hOPf-
er
•
•
Press the NPRO key.
• Remove the last two cards from
the stacker and place them in
front of the input deck.
• Check the card that is now the
first card of the input deck
(i.e., the card that caused the
error) and correct it if
necessary.
•
Return the
input deck to the
hopper.
•
Press the
start key of the
affected unit.
•
Press the
start key on the CPU
console.
b) The incorrect card was read on the
2560 primary feed.
• Remove the input deck from the
primary hopper.
• If the secondary hopper is also
used, remove the input deck from
the secondary hopper.
• Press the NPRO key.
• Remove the last three cards from
stacker 1 and place them in
front of the input deck for the
}rimary hopper.
• Check the card that is now the
first card of the input deck for
the primary hopper (i.e., the
card that caused the error) and
correct it if necessary.
• If the secondary hopper is also
used, remove the last card from
stacker 5 and place it into the
secondary hopper.
• Beturn the input deck (s) to the
hopper (s) •
•
Press the start key of the 2560.
Programmed-Halt Displays and Restart Procedures 121

IBM System/360 20 Specifications

General

Brand	IBM
Model	System/360 20
Category	Storage
Language	English