Table of Contents
Note: This API call is for DOS and Win16 personality only. Use Family API for portability.
Int 21H, AH=58H, AL=03H
Version
5 and higher
Brief
SET UMB LINK STATE
Family API
Input
AH = 58h
AL = subfunction
03h set UMB link state
BX = new link state
0000h remove UMBs from DOS memory chain
0001h add UMBs to DOS memory chain
Return
CF clear if successful
CF set on error
AX = error code (01h) (see #01680)
Notes
a program which changes the UMB link state should restore it before terminating
UMBs will only be available if CONFIG.SYS contains the line DOS=UMB, the UMBs have been linked into the memory chain with AX=5803h, and the allocation strategy has been set to include high memory with AX=5801h
See also
#01687,#02766 at INT 2F/AX=4310h
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 |