Remapping PIC

[Crash-n-Burn]

Hi,
Can anyone tell me if there is any ASM code to save the old pic settings, so that i can restore the old settings if i need to .

If possible not in c as i am not too good with c . ::)


Thanks in advance.

Crash-n-Burn.

[bubach]

Have you read: http://www.osdever.net/tutorials/pic.php?the_id=38
http://www.nondot.org/sabre/os/files/Mi ... asheet.pdf

HTH, Christoffer

[Crash-n-Burn]

Thanks Bubach,

But what i need to know is how to save the original settings, as my OS can be booted from DOS i have trouble when returning to DOS if i remap the pic's.
I know that it is because of remaping the pic's because if i do not remap them it exit's to DOS fine.

Thanks

[bubach]

I can swear that I read about that when I was about to remap the PICs, but now I can't seem to find anything.. :-\

[Pype.Clicker]

DOS has IRQ0 at 0x8 and IRQ8 at 0x70 (or 0x78) iirc. So just restore that setting

you can also want to store the initial PIC mask in a variable that you'll restore later ...

[dh]

You know, this would be great for the wiki! Somebody might have the same problem.

[Crash-n-Burn]

Hi @ all,
Thanks for the replys , As Bubach said i too have seen it on the web but can not find it any were it will turn up when i am looking for somthing els as thins useally do ::)

I am still trying to work through it ???

[dh]

Gr8---ttt!