Int 21H, AH=65H, AL=23H

4.0 and higher

DETERMINE IF CHARACTER REPRESENTS YES/NO RESPONSE

AX = 6523h
DL = character
DH = second character of double-byte character (if applicable)

 CF set on error
CF clear if successful
AX = type
00h no
01h yes
02h neither yes nor no

Supported by Novell DOS 7, though prior to Update 14, the results depended on the kernel variant rather than the YESCHAR= or COUNTRY= setting in CONFIG.SYS

BUG: Novell DOS commands and tools all use internal settings rather than this function, so the Yes/No responses are dependent on the specific country's variant being run rather than on the COUNTRY= setting

Text based on Ralf Brown Interrupt List Release 61