PTPlayer in a C program - VBR?

[hooverphonique]

Originally Posted by Warty

Just out of like, curiosity, what kind of bad behavior should any user foolish enough to run this program expect, if I just like went ahead with using it the way it is? Like, HOW un-system-friendly is using the level 6 interrupts? Is it more than music will lag sometimes, or will it break some piece of system software that was depending on not having the interrupts diverted?

This is from the cia documentation:

/* interrupt control register bit numbers */
#define CIAICRB_TA	0
#define CIAICRB_TB	1
#define CIAICRB_ALRM	2
#define CIAICRB_SP	3
#define CIAICRB_FLG	4
#define CIAICRB_IR	7
#define CIAICRB_SETCLR	7

0-4 are cia interrupt sources, and you will be using one of them - the other 4 may be used by other software or the OS for whatever.. If you rewrite the vector, you basically remove the ability for these other actors to receive their intended interrupts.


Other software that isn't aware of yours may step on your timer setup (thinking the timer is available), and thereby corrupt your sound playback.


The hardware interrupt associated with each cia is also used as "external" interrupts, meaning third party hardware may use them, but this goes haywire if you modify the vector to point to your ISR.

[Warty]

Ok. That all seems bad. <sigh> I will put it on the to-do list. Another opportunity for learning new things!

Thanks everyone. I may have to come back later and beg for help, if I can't figure it out from documentation/google.