Table of Contents
Advertisement
2.36.4 PRD CDIAGNOS'IIC CONDI'IIONS)
The AS-decode=F in a move er a branch Ccn
conditicn or on mask) word accesses this
diagnostic external.
'I·he diagnostic
conditions listed here are defined by the
settings cf PRE tits 0, 1, and 2.
See the
PRB description in the CPU tc External
Facilities (1403).
For exarrt:le, if PRB
bits
o.
1, and 2=000, diagncstic deccde 1
will be usea when FRD is addressed.
2. 36.. 4. 1 Diagnostic Decode 1
Hex. the 8-bi t PRD register ccntains the
i;rint character counter data-in; i.e.,
chain po si ti on.
2.36.4.2 Diagnostic Decode 2
PRD
Bit Na,me
~0-
Print control
latch
1
Print scan
latch
2
PSS gate lat ch
3
Home gate
latch
4
SS3 trigger
5
Print compare
6
Last scan
latch
7
Sync check
latch
Significance if Eit Cn
Printing is cccurring.
If bit-0=1, this bit
is turned en every
time a PSS pulse
occurs.
Set on ty PSS pulses
from the printer.
Set en when hcrre pilse
is detected.
The operaticn is in
sutscan 3.
The PCC and PIE data
rratch.
Print complete has
occurred and the last
scan (for checking) is
in progress.
The chain or train and
FCC were out of
synchronism at home-gate
tirre.
2.36.4.3 Diagnostic Decode 3
PRD
Bit Name
Significance
i f
Eit On
0
Carriage :tusy
An i:rrroediate carriage
command is in
progress.
1
Space drive
On for space or skip
operations.
2
Skii;: drive
en
for skip operations.
3
carriage
The carriage is in the
settling
15.
7 us carriage
settling interval.
4
Carr trush 1
Bits 4-7 disi;:lay the
5
Carr brush 2
contents of the
6
Carr brush
4
carriage brush
7
Carr trush 8
register.
2.36.4.4 Diagnostic Decode 4
PRD
Bit
Na
roe
0
PIC
1
PlB Cl
2
PLB C2
3
PI.B C3
4
~cs
mode
5
Space extended
6
El emitter
7
Channel 1
Significance if Bit On
Print line comi;:lete.
Bits 1-3 indicate check
conditions as a result
of a print operation.
A chain with an MCS
erritter is installed
on the printer, or a
train has operated the
MCS switch on a
1403-Nl.
The outi;ut of the hammer
driver being addressed
is ever 40V.
The cut i;:ut of the
magnetic emitter in
the i;:rinter that
indicates the carriage
has moved one space.
A channel-1 J;Unch has
been sensed in he
carriage tape during a
carriage operation.
2.37 CPU 'IO EXTERNAL FACILITIES (1403)
2.37.1 PRC (CARRIAGE CONTROL REGISTER
DATA-OUT)
A move word with AS-deccde=D is used to set
tits in PRC.
PRC
Bit Name
-0- Skip
1
Carr Ctl
2
Carr Ctl
3
Carr Ctl
4
Carr Ctl
5
Not used
6
7
8
4
2
1
Significance if Bit On
Bits 0-4 are set to the
value of the modifier
bits in the command to
be executed. This
setui;: indicates to the
printer the number of
si;aces to be spaced or
the channel to which
to slii;.
If bits 6-7 are 11, a
printer-busy condition
and an immediate
carriage control
operation are
indicated.
2025 FEMM (7/69)
2-21
Advertisement
Table of Contents
