Mail Archives: djgpp/1996/04/29/23:12:02
Sevilla wrotes:
> 4. When writing the timer interrupt code, take note that 11 kHz is 90.9
> microseconds, or 4500 clocks at 50 MHz, and 22 kHz is 45us, or some 2250
> clocks, and this is your deadline--your timer routine should finish
> everything within this span of time, or else you risk a red switch crash.
> For lower clock rates you'll have even less cycles. With this sort of
> deadline you can see why assembly language is stressed. And in order to
> play music in the background you'll have to call the old INT 8 every so
> often, and the length of a default INT 8 handler varies from system to
> system, and it may not leave you with enough time before your 45us
> deadline runs out.
Hey i made (some years ago) a program that reproduce sound at 10KHz IRQs on a
12MHz Nec V20 (XT man!!) and with MSC 5.1.
The real problem is make the same in protected mode with a 486 DX 33, any
one have idea if this is possible?
bye SET.
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