Re: [MiNT] what's wrong with this code?

[mikro <mikro@hysteria.sk>]

> Why?
>
for speed. i guess Super() is much slower than simple trap call.
 
> That is not supposed to work from user mode on Atari hardware. The 
> bottom few kbyte (don't remember exactly, but at least past the system 
> variables, so probably until $800 or so) are protected by the hardware.
>
of course, i know this fact. that $80.w move i do in supervisor.
 
> You're doing this on a CT60, right? I guess it does something (remap low 
> memory or similar) that makes this possible in the normal case.
>
as long as you don't switch to SV it isn't possible on anything, that's
clear
 
> more overhead). The last one would allow you to add your own Trap #0 
> handler safely (well, at least unless you have turned on maximum 
> protection in MiNT).
>
thanks for tip, but i fear it wont help since there's no problem in handler
vector setting but with the application of it.
 
> MiNT with memory protection should set the MMU up to protect that memory 
> no matter what the hardware does.
> 
> But it really "shouldn't" work in the other cases either. See above.
> 
as i wrote, setting the $80 isn't the issue. if i disable code that calls
trap #0, it works. so that's the reason why i'm so confused with that MP
(non)functionality...

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MiKRO         Atari XE/XL/Mega STE/Falcon060         http://mikro.atari.org
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