Programming Forums - dgroup undefined using /coff

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dgroup undefined using /coff

I am not sure if I have gotten it correct. But first of all: is dgroup and @data doing the same thing? Second of all: do they keep the adress to the data segment, or what are they?

I have a short piece of code where the first line in the entry function is

mov ax, dgroup

This assembles fine when using this command line

ml.exe file.asm

But when I try to assemble the file to coff object file format, I got an error that tells me that "dgroup is an undefined symbol".

ml.exe /coff file.asm

So my question is: why do I only recieve the error using coff? And is there another way to get the value to my ax register, or alternatively define dgroup?

Thanks for your time!

/Klarre

coff doesn't handle 16 bit code, nor do I :)

Quote:

Originally Posted by Klarre

I am not sure if I have gotten it correct. But first of all: is dgroup and @data doing the same thing? Second of all: do they keep the adress to the data segment, or what are they?

Yes try to use @data, but you have to move @data to ds so the following
segment shoud resolve your problem:

mov ax,@data
mov ds,ax ;because you can't move ax direct to your data segment.

Quote:

Originally Posted by Edgar

Yes try to use @data, but you have to move @data to ds so the following
segment shoud resolve your problem:

mov ax,@data
mov ds,ax ;because you can't move ax direct to your data segment.

I does'nt matter which one I use either @data nor dgroup. They are both undefined...