AL,DL and unknowns

[Daryl Lock]

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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[Mel Bishop]

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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[Lance Edmonds]

Something like this may get you started, maybe?

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>

[Daryl Lock]

Originally posted by Lance Edmonds:
Something like this may get you started, maybe?

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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