Yeah that's how you trick the 68k into thinking the Z80 is there.
I'm trying to put the Z80 in for real now =)
> As far as I remember you need to return 1 when read from address 0x320000. I
> think thats how removed the "Z80 Error" message.
> stay safe,
> > To answer my own question for anyone who's curious:
> > The bios will be happy with just the Z80. No ym2610 is needed.
> > > The neogeo bios does a test of the Z80, and hangs with an error message if
> > > Z80 behaves improperly.
> > >
> > > How much of the Z80 needs to be emulated to pass this test? Will the Z80
> > > on its own (with the ym2610 stubbed out), or does it need parts of the
> > as
> > > well?
> > >