32- 64 ( /) . , (16 32 ) . / [16:31] . ( , ), DX ( 16- ).
/ . , . 13 (#GP) ( General Protection Error).
/ - , . , / , . / . . 6 . 4-5 . . , / .
-
, , , , , . - Input-Output (I/O) Card, . , , .
, (, ) , , , ( , female male) , , .
-.
, .
, RS-232C (Recommended Standard), Centronics.
, , . ( , - ) , , , - (Multi I/O Card).
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. . , , . , . 1 /. PC.
IBM PC- , -. MS-DOS , LPT1, LPT2 LPT3. : 3h, 378h 278h. , - , , Hercules EGA. Multi I/O Card LPT1 378h, LPT2 278h. LPT1 IRQ7, LPT2 IRQ5, . (jumpers) , SETUP.
Centronics -. , . , - 8211, -. .
, . , . . .
( ) ( ) . Centronics. .
( 2) . (read only ) :
- 0 = 0: Strobe ( . ),
- 1 = 0: Auto feed ( . ),
- 2 = 0: ,
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- 3 = 1: ,
- 4 = 1: .
11 : (), (Handshake) . , 36- Centronics.
( 2-9 18-25)
. (18-25)
( 1,10,11)
. ( 0 5 ).
Strobe , PC .
Busy PC, , . , .
( 12-17)
, .
Paper End
12 PC , . , , (Select Error). , .
Select Select Input
13 , , On-line () Off-line ( ). 13 . Select Input, 17 36, (On-line), , - .
Error
, , 15 32. Error .
(Time Out). Busy , , Time Out. . Time Out , .
( Init 16 31) . , . , , . . , , .
Auto Feed ( , 14) , , .
, , , , , .. IBM PC- RS-232. 1969 . RS-232 , (International Telecommunications Union, ITU): V.24 ( ) V.28 ( ). RS-232 , . IBM PC- , MS-DOS, , 1, COM2, COM3 COM4.
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, , , , PC . . PC 9 25 .
8250 16450 UART (Universal Asynchron Receiver Transmitter) . 8250 9600 , 16450 115200 .
IBM PC- , . 11 , .