321 player for pc windows xp free download

Static time_t LastTime = time( NULL ) + 1 In my test, I got approximately 92-98 kHz frequency, using this code to test it: void TestCallBack() Void PollAtKhz( int khz, CallbackProc const &Callback ) You can get fairly close to 100 kHz polling using QueryPerformanceCounter in a loop on current CPUs.įor example: typedef void ( *CallbackProc )() Timer 0 and 1 are used for 8254 emulation. Probably Mach 3 is using the High Performance Event Timer (HPET), which according to here is part of recent Intel chipsets.

The third output to the speaker, is mostly harmless to mess around with, but you would need to figure out some way to redirect that signal to something that generates and interrupt, if that's what you need. The first two clock outputs generate interrupts, which is what you want, but the above descriptions of what these outputs currently do ought to give you some pause to reflect that changing their behavior might possibly cause Windows XP to notice. There it explains that output 0 is used to generate the clock interrupt, output 1 is used for DRAM refresh timing, and output 2 is used to drive the internal speaker. There is a lot more about the Intel 8253 in Wikipedia. When I say that the 8253 (or 8254) chip inside a PC is used for driving the internal speaker, I'm not being complete. If you need better, I'm sure there have been improvements since then. It was hooked up to a 1.193182 MHz crystal and has a 16 bit divider. I once build a circuit around the Intel 8253 Programmable Interval Timer chip, which was used inside the original IBM PC for generating the beeps out of the internal speaker. The actual programmable timer chip ought to be much cheaper than that, so if you are willing to roll your own circuit and interface it to the computer, you can probably do a lot better than USD 500. If you can afford USD 500 or so in your budget, there should be lots of hardware options. It can go even faster than you need, and I believe it can even trigger an interrupt. For example, look at this DT-340 from Data Translation. What exactly does this timer need to do? If it just needs to output a square wave between 25 kHz up to 100 kHz, then you will need extra hardware, but not outrageously expensive hardware.

321 player for pc windows xp free download