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SETTING MARGINS
1.
Raise top
cover of
printer.
2.
Press back
on margin lever to
be
adjusted and
slide
it to
desired location
.
3.
Release margin lever
and close
top
cover
of printer.
4.
Verify
accuracy of margin setting
by using TAB
and
RETURN.
CLEARING A NOT READY CONDITION
1.
2.
Veri fy that paper
is
properly inserted between paper
presence
contact and nylon
guide roller.
If
step
1 does
not
clear condition, remove paper and
3.
reinsert it in printer.
Verify
that
1816
print motor
switch on front
panel
is on.
CLEARING AN OVERPRINT CONDITION
l.
2.
Overprinting is usually
caused
by
incorrect
margin
setting resulting in a
printing line shorter than for-
matted
output.
Verify that margins
are
set correctly.
Overprinting may
also occur
if stored program fails
to return carrier. This can
be detected by moving
both
margins to extreme left and
right positions. If
overprinting still occurs at
right margin,
stored
program has probably failed to return carrier.
CLEARING DOUBLE KEY ERRORS
During the process
of entering
messages, two keyboard
keys may inadvertently be pressed simultaneously
causing them
to lock down.
If
this condition occurs:
1.
2.
Press REST KBD. This
unlocks
keyboard
and
releases keys that are
locked down.
Reenter character.
EXAMPLE OF KEYBOARD OPERATION
The
following
example describes a typical use of the key-
board. It should be noted that the sequence of events
given in this
example occur
so quickly that they cannot
be detected.
1.
Press
KBD
REQ.
This initiates an interrupt to
pro-
gram signaling that keyboard entry is
desired.
The
keyboard locks
and
proceed light
turns
off.
2.
Keyboard is placed in
proceed status
by stored
pro-
gram. This causes proceed
ligh
t
to
turn on and
key-
board to unlock.
3.
Enter character by pressing desired key.
64
IBM 1800 Operating Procedures
4.
5.
6.
7.
When key is pressed,
proceed light
turns off and
keyboard is locked.
Keyboard service
interrupt
signals program that character is
ready
to
be read
into
main
storage.
Stored program reads character into main storage.
Stored program places
keyboard
in proceed status.
The proceed
light turns on and
keyboard unlocks.
Steps
3 through
6
are repeated
until message is
com-
plete,
as indicated
by pressing
EOF
(end-of-field).
This
indicates to stored
program
that
message is
complete.
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