Extended memory control (Dos)

[Lionel Pinkhard <lionelp@worldonline.co.za>]

Hi,

I'm having some trouble using HIMEM to allocate extended memory to be used
by my game. My problem is: Once I have the control address, I can't seem
to jump to it. I have it as 'long XMScontrol;' in C, and then I put it in
like this (Asm): (Assuming that it's currently in ES:DX, I can't remember
the exact location, but I have it in my REAL code)

	mov [XMScontrol], es
	mov [XMScontrol + 2], dx

Then, later on, I tried to jump to it using:

	call [XMScontrol]

Now this part is giving me an error when I try to compile, but I can't see
anything wrong with it, I looked in NGASM and it looks legal to me! Can
somebody help me out here? Also, is it possible to do this type of far
call in C? AFAIK All C functions are inside the program, what would I do
if I wanted to jump to another programs' functions? Assuming that I have
the address in XMScontrol?

Ciao,

Lionel

P.s. I have the XMS specification from Microsoft/Lotus/Intel/AST.

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