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PRINCIPLES OF OPERATION
REV.A
Printer Control Signal Read Circuit
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_-
GAAT5P
50 4 ().-----i 504 ...----,
cr-----i50 3
cr----!502
().----!50 1
500 C>----I500
OIRE
05L1
5LCTlN
OINT
INIT
OATF
05 TB
~t-1I--4P------o
AU T0 FOx T
~t-1t-1I--4.-----O
5 TROBE
5LN
INI
ATF..-----'
5 TB ! 4 - - - - - '
FIGURE 2-4-6.
PRINTER CONTROL SIGNAL READ CIRCUIT
Printer Status Read Circuit
GAATSP
S07
\
S03
S07 -
l
t-BSY
S06 -
S
I -
ACK
2
-
SOS -
4
I-
EOP.
4
S04 -
t-Sl P
S03 -
G
t - ERR
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I
ADORESS
I
lJECOOER
BUSV
ACK
PE
SlCT
ERROR
FIGURE 2-4-7. PRINTER STATUS READ CIRCUIT
Interrupt Signal Control Circuit
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ACK
J 10
...
....--
-
B
-
-
C
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OJRE
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bit"
JRS
JR7
GAATSP
FIGURE 2-4-8.
IlITERRUPT SIGNAL CONTROL CIRCUIT
2-68
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