Re: [hatari-users] RESET instruction and MFP

[Nicolas Pomarède <npomarede@xxxxxxxxxxxx>]

Le 29/08/2012 22:26, Vincent Rivière a écrit :
> Hello.
>
> I use Hatari 1.6.2 on Windows.
>
> Basically, the RESET assembler instruction does not correctly reset the
> MFP.
>
> Just tested on my real STe:
> After a RESET instruction, the MFP IERB (0xfffffa09) is reset to 0.
>
> But with Hatari, the IERB is unchanged after a RESET instruction, and
> the MFP interrupts are still enabled. This can lead to wrong behavior in
> programs which use the RESET instruction (I hit that with EmuTOS).
>
> I suppose that the situation is the same with the MFP IERA (0xfffffa07)..
>
> This looks like a Hatari bug.

Hello

it's true "reset" is not always propagated to all the peripherals right 
now (I added a few ones for specific cases when needed, but not all of 
them).

We already have a "MFP_Reset" function, but it's only called on 
warm/cold hardware reset, not on the reset instruction (in hatari-glue.c 
customreset() )

I add this to my todo list to check what is required and if no side 
effect appears.

Nicolas