Re: 6502 coprocessor for the apple II?

[Mike Westerfield <MikeW50@aol.com>]

The 65802 seemed to be the most common. Western Design Center slipped
a few of those our way so we could develop the assembler syntax for
the 65816 and have it ready to go on day one. ORCA/M had a 65816
assembler that worked just fine under ProDOS 8 using one of these
chips. It plugged right into the socket for the 6502. Apple made a
late change in the motherboard design for the Apple //c for that very
reason: The original design was slated to have the CPU soldered in,
but it was replaced by a socket.

This gave you the extra instructions of the 65816, although the
address bus was still limited to the 64K provided by the pinout for
the 6502.

I don't recall an actual coprocessor, though.

Mike Westerfield

On Dec 3, 3:30 am, mdj <mdj....@gmail.com> wrote:
> On Dec 3, 8:41 am, "sfahey" <sfa...@a2central.com.remove-kwn-this>
> wrote:
>
> >   To: mh4
> >   Re: Re: 6502 coprocessor for the apple II?
> >   By: mh4 to comp.sys.apple2 on Tue Dec 02 2008 10:09 am
>
> >  > What was its purpose? Train 6502 programmers on the 816?
> >  > For later GS programs? It seems to be copyrighted 1986...
>
> > <shrug> Heck if I know... mythical, more capable software that never appeared.
>
> There was VIP Professional, but these things were mainly for
> programmers interested in exploring 816 assembly. Merlin 16 supported
> these and 65802 equipped machines. I guess it gave the owner about a
> year head start versus waiting for the IIGS
>
> Matt