en:docs:dos:api:int21:37:03
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—en:docs:dos:api:int21:37:03 [2020/12/14 10:06] (current) – created prokushev
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 +{{page>en:templates:dosint}}
 +
 +====== Int 21H, AH=37H, AL=03H ======
 +
 +===== Version =====
 +
 +2.x and 3.3+ only
 +
 +===== Brief =====
 +
 +set availdev flag
 +
 +===== Family API =====
 +
 +
 +
 +===== Input =====
 +
 +        AH = 37h
 +        AL = 03h set availdev flag
 +                DL = new state
 +                    00h         \DEV\ is mandatory
 +                    nonzero     \DEV\ is optional
 +
 +===== Return =====
 +
 + AL = status
 +            00h successful
 +            FFh unsupported subfunction
 +
 +===== Macro =====
 +
 +
 +===== Notes =====
 +
 +  all versions of DOS from 2.00 allow \DEV\ to be prepended to device
 +          names without generating an error even if the directory \DEV does
 +          not actually exist (other paths generate an error if they do not
 +          exist); DOS 2.x has an AVAILDEV= option in CONFIG.SYS to make \DEV
 +          mandatory
 +        although MS-DOS 3.3+, DR DOS 3.41+, and Novell DOS 7 accept these
 +          calls, they have no effect, and AL=02h always returns DL=FFh (except
 +          for Novell DOS 7, which leaves AX unchanged for both subfunctions)
 +
 +===== See also =====
 +
 + AX=3701h
 +
 +
 +===== Note =====
 +
 +Text based on [[http://www.cs.cmu.edu/~ralf/files.html|Ralf Brown Interrupt List Release 61]]
 +
 +{{page>en:templates:int}}
 +
 +{{page>en:templates:fapi}}
 +