DOS ain't dead

Rayer's NVclock (Developers)

posted by RayeR , CZ, 05.08.2009, 16:39

> For accessing the MMIO registers you use function
> _DJGPP_Map_physical_memory which isn't supported by Windows 9x.
> But what about accessing the MMIO space from DS register like normal DJGPP
> memory? You can just increase the limit for DS and it should work.
> In Freepascal I wrote the code bellow which could do the job. I tested it
> on LFB region and it works so it should work for other places too include
> the MMIO space.

Could you test it? I used this function as it seems to me closer to original mmap. Otherwise I could use movedata but it will require more changes.

> And why you use for accesing the PCI bus the direct access and not INT 1A
> BIOS calls? Does it have any advantage over it? I am asking because most
> of code I have ever seen use direct method and not INT 1A.

I rather don't rely on PCI BIOS, maybe some bugs there on some PC. I always used direct PCI access (IO port address is fixed so I don't see any problem) without problem.

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DOS gives me freedom to unlimited HW access.

Complete thread:

• Rayer's NVclock - Laaca, 05.08.2009, 12:15 (Developers)
  • Rayer's NVclock - RayeR, 05.08.2009, 16:39
    • Rayer's NVclock - Laaca, 09.08.2009, 19:22
      • bug in NVclock ? - Laaca, 13.08.2009, 09:54