Re: [hatari-devel] Problem with SCSI initiator command register

[Nicolas Pomarède <npomarede@xxxxxxxxxxxx>]

Le 07/06/2012 08:00, Uwe Seimet a écrit :
> Hi,
>
> > Uwe, could you maybe add some printf debugging code to the end of
> > MFP_TimerCData_ReadByte() in mfp.c to see whether IoMem[0xfffa23] really
> > does not change there?
>
> I added the debug code, with an interesting result. The timer values are
> decremented indeed, but my code still does not work. I stripped my code
> down to a few lines, this is the result:
>
> 	move.l #12000,d1
> wait1:	tst.b $fffffa23
> 	bpl wait1
> wait2:	tst.b $fffffa23
> 	bmi wait2
> 	subq.l #1,d1
> 	bne wait1
> 	illegal
>
> The illegal instruction is never executed, the code appears to loop
> endlessly. With a real Atari TT and Falcon it works, but with Hatari it
> seems as if test.b does not work when applied to the timer data
> register.
>
> Take care
>
> Uwe

Hello

what are the initial value for ffffa23 and its control register ?

Would you be able to compile a small .prg with this loop so I could run 
it under Hatari and look at the traces ?

(the problem could be when ffa23 loops from 0 to its starting value, 
this transition might not be accurate in Hatari)

Nicolas