3. general description of the parallel interface, 7 4. data transfer timing, 5. general description of control software – Sharp MZ-3500 User Manual
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7-3. General description of the parallel interface
The 8255 is used for the LSI to control the parallel inter
face. The 8255 can be set in the following mode.
/PORT A: MODE 0
( PORT B ; M O D E 1
V
PORT C : Output
7 4. Data transfer timing
MZ3-0C
Because it is not possible to directly sense the ACK signal as
It
uses interrupt for key processing and RS232C input, the
ACK signal is latched by means of the OBF pm function
PRINTER: MZ-1P02, MZ-1P03CE-
330P, 331P, 332P
* Broken line in the above figure represents timing for the
CE-330Pand 33IP.
*For detail of timing, refer to Manual provided with
printer.
7-5. General description of control software
Set the 20 second counter.
ERROR
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