Specifications
Status
Bits
11=1
12
13=1
14=1
15=1
6-20
Status
Controller
seek error
(Contd)
Not used
Storage
parity error
Protect
fault
Drive seek
error
Description
corrected
by
doing a
status
of
the drive cylinder and comparing
this with the cylinder register (to
find out
how
many tracks and in
what direction the positioning
error
is
from the selected file
address). The first load address
function following a controller
seek error moves the cartridge
disk drive positioner without
changing the cylinder register
and can therefore
correct
the
positioning error.
The bit is cleared by any func-
tion
that
sets
the
busy status.
The controller has received a
parity error signal from the
direct
storage bus while receiv-
ing
data
or control information.
If
the
error is
detected
on
con-
trol
information transfer, the
operation ends immediately. If
the
error
is
detected
during
data
transfer, the operation
~nds
at'
the end of the
sector
being
operated on.
The bit is cleared
by
any output
function.
An
unprotected controller opera-
tion
attempted
to
read or write
in a protected computer storage
area.
If
the error
is
detected
while receiving control informa-
tion from storage, the operation
ends immediately.
If
the error is
detected
while transferring
data
to
or from storage, the operation
ends
at
the end of
sector
being
operated in.
The
bit
is cleared
by
any output
function.
The drive unit has
detected
that
the cylinder positioner has
moved beyond the legal limits
of
the device (below cylinder zero
or above maximum cylinder) dur-
ing a load address, write, read,
compare, checkword check, or
write address function.
The bit is cleared
by
any func-
tion
that
sets
the
busy status.
1740-501
and
1742-1 Line
Printer
Controller
Status
Bits
0=1
1=1
2=1
3=1
4=1
5=1
6=1
7=1
Status
Ready
Busy
Interrupt
Data
EOP
Alarm
Not used
Protected
Description
The printer is operational.
The printer is busy during
the
transfer
and storage of each
character.
It
is also busy
after
the initiation
of
a print cycle and
remains busy until
the
content of
memory is printed. Paper
motion also
activates
the print-
er.
However,
transfer
of
data
to
memory is allowed.
The printer indicates an
interrupt response. The
other
status
bits determine the cause
of the interrupt.
The printer is ready
to
receive
data.
If
an interrupt
on
data
has
been selected, the
data
status
also indicates the interrupt has
occurred.
The printer has
-completed an
operation.
If
the bit is 1, no
operation is in progress.
The printer has an alarm condi-
tion.
The
PROTECT switch
on
the
printer is in
the
protected
posi-
tion. In this position,
the
printer
accepts only those instructions
with a 1
on
the
program
protect
line. All
other
instructions
are
rejected. A protected instruc-
tion can be used with either a
protected or unprotected printer.
1742-30/120
Line
Printer
Status
Bits
0=1
1=1
Status
Ready
Busy
Description
The printer is operational.
The printer is busy during
the
transfer
and storage of each
character.
It
is also busy
after
the initiation
of
a print cycle and
remains busy until the content
of
memory is printed. Paper
96769450 A