[hatari-devel] TOS 1.0 crash

[David Savinkoff <dsavnkff@xxxxxxxxx>]

(Note that I have tried several times to communicate this
message to hatari-devel in the past day. I don't know if
the emails are lost or queued; tough luck I guess.)


Vincent mentioned the following in hatari-users:
> Subject: TOS 1.0 om floppy crashes with less than 2 MB of RAM
>
> Hello.
>
> I try to use the original TOS 1.0 on floppy with Hatari-HG
> (since the mouse works fine now in the bootrom).
>
> Boot ROM: tosload.img
>
> Floppy: disk_tos100_us.zip
>
> It works fine with 2 MB of RAM.
> But it crashes after loading the TOS on floppy with 1 MB or
> 512 kB of RAM:
>
> M68000 Bus Error writing at address $fffffc.
> M68000 Bus Error writing at address $fffff8.
> M68000 Bus Error writing at address $fffff6.
> M68000 Bus Error writing at address $ffffee.
> M68000 Bus Error writing at address $fffff0.
> M68000 Bus Error writing at address $fffff4.
> Detected double bus error at address $fffff8, PC=$964a => CPU halted!
>
> However, the same TOS floppy works fine with 512 kB of RAM
> if I use any other ROM, such TOS 1.0 or OS 1.62.
>
> I don't know if this is a Hatari bug (since the bootrom does
> not work on other emulators), but I just wanted to report.
>

Hi,

I noticed that 512 KiB also works if "Patch TOS for faster boot"
is selected:

working:
F12 > Memory > 512 KiB
F12 > System > Patch TOS for faster boot (selected)

working:
F12 > Memory > 2 MiB
F12 > System > Patch TOS for faster boot (not selected)

This looks interesting. Hopefully a clue.

David