. , BIOS . BIOS Data Area .
BIOS , , , . : , , , . (Loop Back) , , ( ) . BIOS . , , .
, a BIOS , , ( - ). , .
DOS Windows 95 ( MS-DOS). DOS . , .
, . (12) (5) , . (. 1.8).
. 1.8. LPT-: CheckIt, Norton Diagnostics
LPT- . , (CheckIt, PCCheck ..). - .
♦ DOS ( LPTn PRN ), () , ( ) Strobe#.
♦ On Line, , Busy.
♦ , , (SPP) , , IEEE 1284 (. ). 50-100 /, 12 /, , , 2 .
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♦ PnP- , 17 DB-25 36 Centronics. , .
♦ , ( ) . , . , . .
LPT- . DOS- PRINT , . , , . - (, NetWare) . , . , , , , : ( ), -.
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