Re: Apple II VGA video card and the IIgs

[bieling@terra.es (Jorge Chamorro Bieling)]

David Wilson <mcs6502@gmail.com> wrote:

> Jorge Chamorro Bieling wrote:
> > <aiiadict@gmail.com> wrote:
> >
> > > >Is there IIgs-specific slot in the IIgs that is different from the Apple
> > > >II slots ?
> 
> Slot 3 in the ROM01 IIgs and Slots 1-6 in the ROM03 has M2B0 on pin 35
> and both have /M2SEL on pin 39 in slots 1-6. These allow a card to
> detect reads/writes from/to the Mega II RAM and which bank is being
> accessed.

Can you tell me more about this ?
What exactly is the meaning of these M2B0 and /M2SEL signals ?
How does this help to know the bank that is being accessed ?

Thanks,
Regards,
-- 
Jorge Chamorro Bieling