Kulwinder Atwal wrote:
>
> To translate DPM memory is a straight forward procedure:
>
> #define DPM_OFFSET 0xC000
Change this to:
#define DPM_OFFSET 0xC0000000
and you can use the 32 bit flat memory model like RTL and not worry
about segments and offsets in 4 GB space.
- Kal.
>
> #define DPM_TO_CPU (addr) (addr += DPM_OFFSET)
>
> #define CPU_TO_DPM (addr) (addr -= DPM_OFFSET)
>
> - Kal.
>
> Norm Dresner wrote:
> >
> > Back in MS-DOS days, we had functions provided with the compiler to do the
> > conversions between a pointer and a segment:offset description of an address:
> > void *MK_FP( ushort seg , ushort off );
> > unsigned short FP_SEG( void *pointer );
> > unsigned short FP_OFF( void *pointer );
> >
> > I have the need to do computation like this when accessing an ISA board
> > (1st 1M of memory) and when translating the addresses from the dual-ported
> > RAM from what's seen by the CPU on the board to what's seen by the PC (On
> > the board, the DPM looks like it starts at 0x1000:0 while on the PC it's
> > at 0xD000:0).
> >
> > Obviously I could roll my own replacements but before I start doing that I
> > was wondering if it had already been done -- and probably more elegantly
> > (and even more correctly) than I could do (at least the first time I do it).
> >
> > Thanks
> > Norm
> >
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