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IsASCII?
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Written by Troy Benoist   


;Summary: Routine to test whether value in AH is ASCII or not (0-127d = ASCII)
;Compatibility: All DOS versions
;Notes: 4 BYTES! Input: AH=value to check.
    cmp ah,80         ;8DFC80 Compare value in AH to 128 and set flags.
    salc         ;D6     Set AL=FF if CF=1, or set AL=0 if CF=0.
;REGISTERS DESTROYED: AL    RETURNS: AL=0 if AH is not ASCII, FF is so.