A SERVICE OF

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I/O B-1
I/O
B
I/O
B I/O
I/O
I/O
B-1
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2 9 D
1 1 1
COM communications
COM1 COM2
COM1 COM2 COM1 COM2
25 D
I/O 1 8
8 1
LPT line printer
LPT1 LPT1