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, , . , 255, 65536 (. .1.3). , 251 12:
( ). ( 00000111B = 7D).
CF. , , , . , , JC JNC (. .9.2).
, . , , , . CF. , , 3 9:
, , , .
, CF. , .
, (. .1.6). ( ), . . , .
, .1.3.
, , ( ) :
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, . , , (+128). 1, ( ). OF. , , JO JNO (. .9.2).
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, . , . OF. CF .
. ( ). CF, OF .
OF , ( ) ( ). OF , .
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, OF. , .
, ADD ( . ADD ) SUB ( . SUBtract ). .10.1.
. 10.1. ADD SUB
. , , . (-). CF, OF, ZF, SF PF.
per1 DB 130
per2 DB 42
MOV AH,12
ADD AH,21
ADD AH,per1
SUB AH,per2
( ) ADC ( . ADd with Carry ) SBB ( . SuBtract with Borrow ). : ADC , SBB .
, 32- :
, ( , ). , AX, BX, CX, DX, :
ADD AX,CX
ADC BX,DX
.