Specifications

Status
Bits
1=1
2=1
3=1
4=1
5=1
6=1
7=1
8=1
Status
Busy
(Contd)
Interrupt
Data
EOP
Alarm
Error
Protected
Load image
Description
motion also
activates the print-
er. However, transfer of data to
memory is allowed.
The
printer indicates an inter-
rupt 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.
Parity synchronization or com-
pare error
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.
The image memory of the line
printer must be loaded (1742-120
only). The next 288 characters
are sent to image memory.
1743-2 Asynchronous Communications Controller
Status
Bits
0=7
8=1
9=1
10=1
11=1
Status
Data
Break
Lost
data
Character
request
Character
ready
96759450 A
Description
Data received from· terminal
No valid stop bit has been
received.
Data was not read before a new
character was shifted into the
holding register.
The send section is in the proper
condition
to receive data from
the computer.
The holding
register in the
receive section contains a valid
character.
Status
Bits Status
15=1 Parity error
Description
The
parity of the received char-
acter does not agree with
selected parity type.
1744/274 Digigraphic Controller
Status
Bits
0=1
1=1
2=1
3=1
4=1
5=1
6=1
7=1
8=1
9=1
10=1
11=1
12=1
13=1
14=1
15=1
Status
Power off
Delay
interrupt
Light pen
Priority
interrupt
Light pen
interrupt
Delay
interrupt
Light pen
Display
Function
keyboard
Alphanumeric
keyboard
Special
function
keyboard
LIGHT
PEN
switch
Keyboard
interrupt
Keyboard
interrupt
Priority
interrupt
LIGHT PEN
switch
interrupt
Description
The console power is
off (console
disabled).
The delay
interrupt is received.
Light pen
strike interrupt
The priority
interrupt is
received.
The light pen switch
interrupt
flip-flop is enabled.
The delay
interrupt flip-flop is
enabled.
The light pen
strike interrupt
flip-flop is enabled
Terminate the display following
the light pen
strike interrupt.
The variable function keyboard is
activated.
The alphanumeric keyboard is
activated.
The special function keyboard is
activated.
The LIGHT PEN switch is on.
Keyboard
interrupt
The keyboard interrupt flip-flop
is enabled.
The priority
interrupt flip-flop is
enabled.
LIGHT
PEN switch interrupt
6-21