Mail Archives: djgpp/1994/12/01/03:34:30
I am doing a school project rewriting an older program for an old maching
and converting it into compatable code for Gnu C. I have a buffer that
needs to be in low(DOS) memory for the hardware to work with it. I have
looked in the dpmi documentation and it said to use:
int86()
0x0100->ax
bytes/16->bx
this would return:
if carry clear:
ax->segment
dx->selector -DON'T USE- use dosmemX() instead
I am confused what this means.^^^^^^^^Do I just shift the segment over
four bits and use that as the 20bit address or do I have to get some
offset from the dosmemX() function to add to it? Also, does the capital
X in dosmemX() mean any of the functions of that type (dosmemget/dosmemput)
???? Or are they just used to transfer data around in memory??
Does Gnu C use some sort of virtual memory map that these functions
would be necessary???
Also, the program uses the low memory buffer to transfer input data to
another buffer in high memory for storage. Would the dosmemget() and
*put() function work for transfer memory faster than transfering data
from the arrays in a loop?
Any help would be appreciated
Thanks
John Hoeschele
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