Specifications
Status
Bits Status
4 Not used
5=1
Alarm
6=1
Lost
data
7=1
8=1
9=1
10=1
11=1
Protected
Reader non-
existent
Paper motion
failure
Power on
End-of-file
Description
Indicates a paper motion failure,
lost
data,
or reader power turned
off
Indicates the
data
is not trans-
ferred
to
the
computer before
the
next frame appears for
read-
ing. A lost
data
signal is gener-
ated
to
indicate a frame has
been passed. Tape motion stops
after
the
frame is read.
Indicates
PROGRAM PROTECT
switch is on
Indicates the station does not
exist
Indicates a change in
state
did
not occur in the feed hold circuit
for
40
milliseconds while trying
to
read
The power is on.
An
end-of-file has been
detected
(set
by
driver).
1723/1724/1777
Paper
Tape
Station
Punch
Status
Bits
0=1
1=1
2=1
3=1
4
5=1
Status
Ready
Busy
Interrupt
Data
Not used
Alarm
96769450 A
Description
The paper tape punch
is
opera-
tional.
The paper tape punch is busy.
Indicates an interrupt occurred
The
data
in
the hold register has
been processed and
new
data
may be received
Indicates a tape break, punch
power off, or
tape
supply low. A
validation
error
sets
status
bit 6
only. This
status
is cleared with
a clear interrupt or clear con-
troller function.
Status
Bits
6=1
7=1
8=1
9=1
10=1
11=1
Status
Validation
error
Protected
Pun'ch non-
existent
Tape break
Power on
Tape supply
low
Description
Indicates a validation error.
If
a
validation
error
is
detected
by
the controller, tape motion is
prevented and the incorrect
punch
character
is
held. This
permits
the
computer
to
gener-
ate
the same
character
again or
o characters, which
are
punched
over the incorrect character.
Lack of error
status
after
re-
punching does not necessarily
indicate
that
the
incorrect
char-
acter
was corrected.
NOTE
Bi
t 6 is used only by the
1777
Paper Tape
Sta-
tion Punch. Bit 6 is not
used by 1723/1724
Paper Tape Station
Punch Units.
Indicates the PROGRAM
PROTECT
switch is on
Indicates
that
the
station
does
not exist
Indicates the punch supply
tape
has broken or run out and
approximately 2 inches
of
tape
remain
The power is on
Limited supply of
tape
remaining
to
be punched
1726-405
Card
Reader/Controller
Status
Bits
0=1
1=1
2=1
Status
Ready
Busy
Interrupt
Description
The card
reader
is operational
The controller is busy whenever
a card is being
entered
into
the
buffer memory.
The interrupt
status
is available
if
one or more of the selected
interrupts has occurred.
Other
bits must be monitored
to
deter-
mine the condition causing the
interrupt.
6-9