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Printer Status Bytes Bit Descriptions
Status Byte A (RAL2)
Bit
O-Print
Emitter Latch
3:
Monitors the printer error
conditions and times the print wire firing.
Bit
1-Print
Emitter Latch
2:
Monitors the
printe~
error
condition and times the print wire firing.
Bit
2-Print
Emitter Latch
1:
Monitors the printer error
condition and times the print wire firing.
Bit 3 - Wire
Check
or Not
Ready:
Signals the adapter
that a print wire magnet was energized
for
more than
1.6 ms when printing or 3.0 ms when not printing.
Bit
4-Forms
Emitter B: Determines when
to
stop.
Bit
5-Forms
Emitter A: Forms movement.
Bit
6-Not
End
of
Forms: Indicates the presence
of
forms. This signal is active when forms are within
two
inches (50.8 mm)
of
the print line.
Bit 7 - Left Margin: Used
as
a reference
to
position the
print head.
Status Byte B (RBL2)
Bit
O-Print
Motor Latch B
(0
= not B): Provides
controls
for
the print head stepper motor.
Bit
1-Print
Motor
Latch
A
(0
= not A): Provides
controls
for
the print head stepper motor.
Bit
2-Print
Emitter Interrupt:
Gen~rates
an
'interrupt
request 2' when print emitters are activated by the
microprogram.
3-78
Bit 3 - Not
Ready
Interrupt: Is
caUl~ed
by the printer
adapter sensing a
not
ready condition from the printer.
Bit
4-Forms
Motor Latch B
(0
= not B): Provides
controls
for
the forms feed stepper motor.
Bit
5-Forms
Motor Latch A
(0
= not A): Provides
controls
for
the forms
feed
stepper motor.
Bit
6-Forms
Control Interrupt: Generates
an
'interrupt
request
2'
by changing conditions from the forms
control emitter.
Bit
7-
Timer Interrupt: Indicates that the timer
interrupt controls the speed
of
the print head stepper
motor.
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