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

[Eero Tamminen <oak@xxxxxxxxxxxxxx>]

Hi,

On 11/23/20 12:47 AM, Roger Burrows wrote:
> When the "STe Bus Emulation" bit (0x20) in the Falcon Bus Control Register at
> $ff8007 is zero, "STe Bus Emulation" mode is set.  This affects bus error
> handling.  Hatari already models this as far as the I/O memory area is
> concerned (I haven't attempted to check how accurately yet).  But it also
> affects bus errors when accessing RAM, which Hatari does NOT model.  Basically,
> on a real Falcon with "STe Bus Emulation" enabled, there are NO bus errors
> generated for the whole $0 to $dfffff region, even in user state.  Even if RAM
> isn't present at an address, no bus error occurs.

Do reads to non-existing RAM areas produce some specific value like 
zero, or random values, or
is the target location value just unmodified?


> This should be easy for any of the developers to verify, but I can post a copy
> of the test program I used if you would like.


	- Eero