[hatari-devel] Wotanoid problem : final fix before commit ?

George Nakos ggn at hol.gr
Sun Jan 24 21:20:45 CET 2010


Hello Laurent,

Sunday, January 24, 2010, 10:10:38 PM, you wrote:

> Doesn't $FFFFFFFF is filtered in $7FFFFFFF somewhere in gemdos code 
> (with a AND or something like that ) ?

I   tried  $ffffffff  on  my  ste  and it didn't read the file at all,
whereas $7fffffff worked just fine. Didn't test on my falcon though...

> Laurent


> Laurent Sallafranque a écrit :
>> But in Wotanoid, the instruction is :
>>
>> move.l      #-1,D0
>>
>> Regards
>>
>> Laurent
>>
>>
>> George Nakos a écrit :
>>   
>>> Hello Eero,
>>>
>>> Sunday, January 24, 2010, 8:46:27 PM, you wrote:
>>>
>>>   
>>>     
>>>> Hi,
>>>>     
>>>>       
>>>   
>>>     
>>>> On Sunday 24 January 2010, George Nakos wrote:
>>>>     
>>>>       
>>>>>>>>> My  memory  is  a bit hazy, but I think this just tells gemdos to
>>>>>>>>> read $ffffffff  bytes  from the file. Of course gemdos will read as
>>>>>>>>> much as the  file  size  and then return an error in d0.l. It's the
>>>>>>>>> lazy man's approach  to  doing  things  the  Right Way(tm) (i.e.
>>>>>>>>> getting the file length  -or knowing it beforehand- and calling
>>>>>>>>> fread() with the proper amount of bytes)
>>>>>>>>>               
>>>>>>>>>                 
>>>>>> George, have you actually used this on actual HW so that it has worked?
>>>>>> With which TOS version(s) it works like that?
>>>>>>         
>>>>>>           
>>>>> Yup,  on  a STE with TOS 1.62UK and STFM with TOS 1.02UK. Also, that's
>>>>> we use that in ULSv3 for a couple of years now and it works in all our
>>>>> test equipment (MSTEs, Falcons, a TT, etc)
>>>>>       
>>>>>         
>>>   
>>>     
>>>> George, regarding Thomas' comments and you saying that your memory
>>>> on this is a bit hazy...
>>>>     
>>>>       
>>>   
>>>     
>>>> Could you verify that the value you've used is really "$ffffffff" and not
>>>> just the largest possible _signed_ value?
>>>>     
>>>>       
>>>  Just wrote a small program to test this, it works with $7fffffff, aka
>>>  biggest signed vaule.
>>>
>>>
>>>
>>>   
>>>     
>>
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>>
>>
>>   

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-- 
Best regards,
 George                            mailto:ggn at hol.gr




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