Canon AS-100C, Руководство по обслуживанию на месте

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CPU recognizes the optional interface connected to each port
through status read, and I/O memory area is allocated for
individual interfaces via port select.
Table 1.2.2
Option port
Port select Status read
A
8
A7 A
6
A5 A4 A3 A2 A1 AO A 8
A7 A
6
A5 A4 A3 A3 Al A0
OPT 2
1 0 0 0 Addre8s
• L u u within port
1 0 1 1 -
OPT3
1 0 0 1
"
1 1 0 0
_
OPT4 .
1 0 1 0
"
1 1 0 1
-
Note: AO 'v A
8
are address buses.
Optional port
Option interface
0PT2
RS232C CENTRONICS CURRENT LOOP
0PT3 RS232C COMMUNICATION CURRENT LOOP
0PT4 RS232C
H.DISK I/F CURRENT LOOP
1.2.9 RS232C (option)
RS232C serial interface connected to I/O MOTHER.
1.2.10 CENTRONICS (Option)
CENTRONICS interface connected to I/O MOTHER.
1.2.11 COMMUNICATION (Option)
COMMUNICATION interface connected to I/O MOTHER
1.2.12 CURRENT LOOP (Option)
CURRENT LOOP interface connected to I/O MOTHER.
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