Specifications
Status
Bits
5=1
6=1
7=1
8=0
9=1
10=1
11=1
Status
Alarm
Lost
data
Pari ty
error
Not used
Read mode
Not used
Manual
interrupt
Description
A lost
data
or parity
error
condi-
tion has occurred.
The holding register contained
data
for
transfer
to
the
com-
puter,
and the
teletypewriter/-
conversational display terminal
began to send a new
character.
A pari ty
error
has occurred in
the
data
character
received from
the
teletypewriter/conversatio-
nal display terminal.
Always
0
The controller is conditioned for
an input operation.
Always 1
A manual interrupt has occurred.
1811.2
Conversational
Display
Terminal
(COT)
Status bits for
the
1811-i.: Conversational Display Terminal
are
the same as those for the 1843-2 Communications Line
Adapter described
later
in this section.
1827.2
line
Printer
Status bits for the 1827-2 Line Printer
are
the same as those
for the 1843-2 Communications Line Adapter described
lat-:'I' in this section.
1828·1
Card
Reader
Controller
and
1829.30/60
Card
Reader
Status
bits
0=1
1=1
2=1
3=1
6-24
Status
Ready
Busy
Interrupt
Data
Description
The
card
reader
is ready (i.e.,
powered. input hopper loaded,
output
stacker
not full, no feed
failure,
no
card
motion failure,
and
no
read alter). Manual
inter-
vention is required
if
any
of
these conditions
do
not exist.
:rhe
card
is
currently being read.
It
is automatically cleared by
card
cycle completion.
The card
reader
generated
an
interrupt.
Bits 3,
4,
and 5 define
the
type of interrupt.
The
data
register holds
data
for
transfer
to
the
CPU. Bits 2 and
3
are
cleared automatically by
data
transfer
to
the
CPU.
Status
Bits
4=1
5=1
6=1
7=1
Status
End-of-
operation
(EOP)
Alarm
Lost
data
Protected
Description
The read cycle is completed
(81st column time). Bits 2 and 4
are
cleared automatically
by
the
start
of the next read cycle.
Error due to one of:
• Lost
data
• Any not ready condi tion
The cause
of
the alarm must be
corrected
before the alarm bit
can be cleared.
Bi
t 2 is also
cleared
at
that
same time.
Data
not
transferred
to
the CPU
before
the
first column of
data
on
the
next card was ready for
the
buffer.
All
the
rest
of the
columns onthe card
are
rejected
until
an
end-ofoperation occurs.
The
protect
jumper is installed.
8=1
Not used
9=1
10=1
11=1
12=1
13=1
14=1
15=1
Not ready Logical complement of bit 0
(ready)
ADT
mode The CPU has
set
the controller
for an
auto-data
transfer
(A/Q
buffered) transfer.
End-of-file The controller
detected
the end-
of-file card.
Hopper
empty The input hopper is empty, and
the
last
card was read.
Stacker full The output
stacker
is full, but
the
top
card
was read.
Failed
to
The're was a failure
to
feed
the
feed
current
card
after
two
attempts.
Stacker
jam
There is a jam
in
the
path
between the reader and
stacker.
1832·.4
Magnetic
Tape
Controller
and
1862.72/92
Tape
Transports
Status
Bits
0=1
1=1
2=1
3=1
4=1
Status
Ready
Busy
Recovered
error
Irrecoverable
error
Not used
Description
The controller and drive
are
ready.
The drive is busy terminating
the
previous command (except
rewind).
96769450 B