Re: New GS/new accelerator

["Charles Stephens" <charles_stephens@hotmail.com>]

"Jonathan Schattke" <wizwom@ripco.com> wrote in message
38B85C70.F7F3F088@ripco.com">news:38B85C70.F7F3F088@ripco.com...
> bobryan9@my-deja.com wrote:
> > Facts:
> > Apple IIs have a 1 Mhz bus.
> > 1 Mhz video
>
> > Use an existing motherboard: Already built.  Just interface a 65816
> > (65832?  65864?) to the processor socket.  Create a 65816 video
> > driver.  Build either adaptors (plug adaptor into PCI/ISA socket, plug
> > apple II card into adaptor), or make a PCI/ISA card that has a cable
> > that runs to a card you built for the GS.  It could be just a straight
> > through cable/card combination.  Just connect the Data lines.  You
> > might want a buffer.
> >
> > Advantages:  Use all your own Apple II cards.  Use high resolution
> > video capture and other types of PC interface boards.  High speed disk,
> > memory, video access.
>
> This, indeed, is a good idea
>
> The transfer is at the native speed of the IIgs processor, but the
transfer from
> _what_ becomes the question.
>
> I think the cheapest solution would be a PCI peripheral card to interface
to a
> IIgs through the processor socket.
>
> Minimum would then be an I/O processor, which would map the I/O portions
of the
> IIgs into the PCI memory space, and use write-through caching for the IIgs
RAM.
> This would require a very minimal processor on the board, since all it
would
> have to do is handle the holding of the signals properly for the hardware
> emulation of the 65816.
>
> The software emulation would be handled by the main proccesor, either a
powerPC
> or an Intel PCI motherboard could be used.  In fact, you could have your
Wintel
> machine be your most powerful IIgs peripheral :)
>
> This would just be a souped-up ICE, in principle.

That is a horribly expensive idea.

Why not just build a MMU/cache controller around a faster 65816 and have a
slot for a single DIMM and if there is room, a USB port.  KISS, people,
KISS.

cfs