What is SIO IRQ?

RZetlin · June 3rd, 2001

Under the Options menu there is a menu labeled SIO IRQ always enabled [F4].

What is SIO IRQ?
How does work?
Why do some games need this option on and some don't?

Metalmurphy · June 5th, 2001

Yeah! Some one anwser RZetlin question cause I also need to now!

:mg:

Enigma1982 · June 5th, 2001

Yep,Someone should explain this to him.
Because I really want to know too.................

cluthu · June 6th, 2001

Though I'm sure that I could be very very wrong, I'd always assumed that it was an interrupt request (hence the IRQ) in the PSX hardware that had something to do with the low level execution of a given game/piece of software. My reasoning is that clearly it has something to do with Input/Output (I/O) and that by causing the SIO IRQ to be registered, the PSX goes out into its memory (or to the CD Drive, I guess) and checks to see if any new instructions are waiting to be executed.

Just think, by pressing F4 a game can restart after appearing to "freeze." Though only the emulator developers can answer with any certainty, I'd bet that it causes whatever's being processed to be overlooked and have the emulator go out and process the next bit of its instructions. After all, this is similar to how a computer's IRQ system works. I'd also bet that it makes whatever instruction it reads after you press F4 exclusive, hence why it won't accept joystick movement until after you toggle F4 again.

Of course, as I'd said, I could be completely wrong

Enigma1982 · June 8th, 2001

Thank you to explain it cluthu...............

June 3rd, 2001	#1 (permalink)
RZetlin General of Tangerines Join Date: Jun 2001 Location: Defending the Sea Posts: 3,885	What is SIO IRQ? Under the Options menu there is a menu labeled SIO IRQ always enabled [F4]. What is SIO IRQ? How does work? Why do some games need this option on and some don't?

June 5th, 2001	#2 (permalink)
Metalmurphy Ataru Moroboshi Fan =) Join Date: Jun 2001 Location: Portugal, Oporto Posts: 5,759	Yeah! Some one anwser RZetlin question cause I also need to now! :mg: __________________ -------------------------------- Computer Specs ---------------------------------- Intel Pentium IV Prescott 3.0 HT → 4x 512MB DDR-DIMM → ASUS GF 6800 GT Sound Blaster X-Fi → 2x Maxtor 80 GB (RAID 0) Hitachi 19'' Monitor → Cambridge Soundworks Desktop Theater --------------------------------------------------------------------------------------------

June 6th, 2001	#4 (permalink)
cluthu Registered User Join Date: May 2001 Posts: 513	Though I'm sure that I could be very very wrong, I'd always assumed that it was an interrupt request (hence the IRQ) in the PSX hardware that had something to do with the low level execution of a given game/piece of software. My reasoning is that clearly it has something to do with Input/Output (I/O) and that by causing the SIO IRQ to be registered, the PSX goes out into its memory (or to the CD Drive, I guess) and checks to see if any new instructions are waiting to be executed. Just think, by pressing F4 a game can restart after appearing to "freeze." Though only the emulator developers can answer with any certainty, I'd bet that it causes whatever's being processed to be overlooked and have the emulator go out and process the next bit of its instructions. After all, this is similar to how a computer's IRQ system works. I'd also bet that it makes whatever instruction it reads after you press F4 exclusive, hence why it won't accept joystick movement until after you toggle F4 again. Of course, as I'd said, I could be completely wrong __________________ "...everything else is just theory."

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June 5th, 2001	#3 (permalink)
Enigma1982 Do not Disturb Join Date: Jun 2001 Location: Bangkok,Thailand Posts: 1,808	Yep,Someone should explain this to him. Because I really want to know too.................

June 8th, 2001	#5 (permalink)
Enigma1982 Do not Disturb Join Date: Jun 2001 Location: Bangkok,Thailand Posts: 1,808	Thank you to explain it cluthu...............