X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 15 - dos 3.x print.com - set critical region flag (at,xt286,ps50+)

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INT 15 - DOS 3.x PRINT.COM - SET CRITICAL REGION FLAG (AT,XT286,PS50+)
        AX = 2001h
        ES:BX -> byte which is to be incremented while in a DOS call
SeeAlso: AX=2000h

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