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AL,DL and unknowns

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  • AL,DL and unknowns

    I'm getting your moneys' worth here

    I've started exploring the documents for programming the DR-DOS Multitasking API and although it is apparently easy to use, the examples all require a value to be pushed onto either the AL or DL register before calling &H2F and retrieving the result in AX/DX etc. Now what I know at this point about register level or asm could fill a byte...
    I've pored over the PB manual/User guide and examples on this site but see no reference to getting a value to AL, DL et al
    Can someone supply an example of how (if possible) it can be done?




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  • #2
    Lets say you have to store 45 in AH and 56 in AL and DRDOS uses
    16-bit registers (I don't know this for a fact):

    Reg 1, (45 * 256) + 56



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    There are no atheists in a fox hole or the morning of a math test.
    If my flag offends you, I'll help you pack.

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    • #3
      Something like this may get you started, maybe?
      Code:
      FUNCTION CallInt2F(BYVAL z?) AS INTEGER
        !PUSH DS
        !MOV AX, 0
        !MOV AL, z?
        !INT &H2F
        !MOV FUNCTION, AX
        !POP DS
      END FUNCTION
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      Lance
      PowerBASIC Support
      mailto:[email protected][email protected]</A>
      Lance
      mailto:[email protected]

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      • #4
        Originally posted by Lance Edmonds:
        Something like this may get you started, maybe?
        Code:
        FUNCTION CallInt2F(BYVAL z?) AS INTEGER
        Thanks to Mel and Lance

        I managed to grapple my way through it - I misunderstood the concept at first but I managed to get it to actually do some stuff (loading a new process, adjusting the memory up and down, causing an XMS GPF...that sort of thing



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