Re: [hatari-devel] Small bug in Hatari Falcon emulation

[Eero Tamminen <oak@xxxxxxxxxxxxxx>]

Hi,

On 11/25/20 3:27 AM, Roger Burrows wrote:
> On 25 Nov 2020 at 2:34, Eero Tamminen wrote:
....
> > > I did write a separate program to do:
> > > 	read
> > > 	write new/read
> > > 	write old/read
>
> > > and the value returned isn't always $ff

Sorry, I somehow missed the "n't".

(I blame late night and my eyesight.)


> (and rewriting the original value
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>
> > > doesn't restore it, unsurprising considering there's no RAM there).  I
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Yes, that's obvious. :-)


So in conclusion, the reads to non-existing ST-RAM
areas give seemingly random data.

Could you send results from scanning the memory
with byte & word widths?  I could try generating
some word/byte/nibble value histograms out of it
to see whether there are any patterns, either as
a whole, or in relation to the address.

(If there are, those would need to be verified
then with data from some other Falcon.)


	- Eero