On Fri, Feb 08, 2008 at 10:54:35AM +0000, Simon Townsend wrote: > Hi, > Is a way of changing the DOS timer (the one that is about 1/18th seconds) > either within DOS or from a C program? > I'm trying to use Freedos to run a PCI serial board so I can do some DMX > controls and need some timed pauses. > > Not sure what its called exactly - DOS talk is not yet very familiar to me :-)
If I remember correctly the counter-timer chip (CTC) has more than one clock generator (about 20 years ago, for some crappy memory, I had written a refresh accelerator). Since other functionality relies on proper timing as well, it's a bit tricky to speed up/modify the system clock (you'd have to pass only every n-th tick through to keep the clock synced with the wall clock). I'd have to dig for the old source codes, and yellowed pages of hw docs... Steffen ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Freedos-user mailing list Freedos-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freedos-user
