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MOV [S1],[DI] RCR DX, CL IN AL, DX RET 4
IN AX,0378H MOVBL,AL MOVSB SHLAX,1
INC A DECA INC DPTR SWAP ACC
INC A DECA I NC DPTR SWAP ACC
IN AL,20H OUT 20H,AL MOV 20H,AL ADD AL,20H
IN AX,0378H MOV BL,AL MOVSB SHL AX,1
PUSH AL ADC AX,[SI] INT 21H IN AX,03H
IN AX,03F8H MOV BL,AL MOVSB SHL AX