Deckard wrote:
> On Feb 1, 12:33 am, Alex Freed  wrote:
>> It doesn't have much space for extra code
> 
> Enough for me ;-)

Great job but I was talking about the DOS3.3 page - identical to the ROM 
on the real floppy controller cards.

> 
> I've optimized the code and added a test to check if the open apple is
> pressed and if so change the origin.
> And the free bytes are always = 11.
> 
> My proposal:
>
http://boutillon.free.fr/Underground/Outils/Beautiful_Boot_PD8/Txt/ALT_BOOT_MMC.txt
> 
> I can't test it. Do you think it could work?

I think it should, but one issue is that a different page of the ROM is 
mapped in nibble mode. There should be a provision added to switch the 
address line so as to map in the "ProDOS" page that you have optimized.
In my design hitting reset on the Apple doesn't reset the AVR.

-Alex.
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