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DA T A BUFFER FULL
DATA
DATA STB
BUSY
~
/
T7
"I
PRINT
.,
INPUT BUSY
------------------------~\ ~-------
ACK
T7 = 0.2 TO 1
ms
Figure 2-22 Parallel Printer Controller Interface Timing (cont'd)
NO DATA IS IN THE DATA BUFFER
PE
SELECT
FAULT
BUSY _ _ --s
SEL SW ON
RECEIVE DATA
PRINT ONE LINE
STORED DATA IS IN THE DATA BUFFER
PE OCCURS
PE
SELECT
~-------------------------~
FAULT
BUSY ________________
~~
PE
DESELECT
FAULT
BUSY
PRINT ONE LINE
r-J------
L ...... _ _ _ _ _ _
Figure 2-23 Parallel Printer Controller Interface at Paper Out Status
Processor PCB
2-37
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