Table of Contents
Note: This API call is for DOS and Win16 personality only. Use Family API for portability.
Int 21H, AH=37H, AL=02H
Version
2.x and 3.3+ only
Brief
get availdev flag
Family API
Input
AH = 37h
AL = 02h get availdev flag
Return
AL = status
00h successful
FFh unsupported subfunction
DL = 00h \DEV\ must precede character device names
= nonzero \DEV\ is optional
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=3703h
Note
Text based on Ralf Brown Interrupt List Release 61
| osFree Macro Library | |
|---|---|
| Video I/O | @SetMode @SetCurSz @SetCurPos @GetCur @SetPage @ScrollUp @ScrollDn @Scroll @GetChAtr @PutChAtr @PutCh @SetPalet @SetColor @SetDot @GetDot @WrtTTY @VideoState @GetMode @GetDisplay @GetVideoState @GetEGAInfo @Cls |
| Hardware info | @Equipment @MemSize |
| Serial I/O | @AuxInit @AuxSendChar @AuxRecieveChar @AuxStatus |
| Tape I/O | @TapeOn @TapeOff @TapeRead @TapeWrite |
| Keyboard I/O | @KbdStatus @CharIn @CharPeek |
| Printer I/O | @PrnPrint @PrnInit @PrnStatus |
| Disk I/O | @DskReset @DskStatus @DskRead @DskWrite @DskVerify @DskFormat |
| Date and Time | @SetTime @GetTime |
| Mouse | @MouInit @MouShowPointer @MouStatus @MouSetPos @MouSetMickey @MouRegion |
| Memory manager | @ModBlok SET_BLOCK |