Date   : Tue, 09 Aug 2005 22:01:57 +0100
From   : Phil Blundell <philb@...>
Subject: Re: 80186 co-pro

On Mon, 2005-08-08 at 21:45 +0200, John Kortink wrote:
> On Mon, 08 Aug 2005 19:44:10 +0100, Phil Blundell wrote:
> >So, a little bit of googling reveals that WDC actually sell a 65C02
> >variant that's rated for 14MHz at 5V:
> >
> >http://www.westerndesigncenter.com/wdc/w65c02s.cfm
> 
> Yep, I have a couple here, got them from WDC as samples
> (I'm not sure if they're easier to get by now, back then,
> some years ago, they were only available in bulk really).

Judging from the WDC website, yes, you can buy them in small quantities
nowadays.

> >One of those, plus say a megabit of 15ns SRAM, would make a neat second
> >processor.  You'd just need to add a little boot ROM and a Tube ULA (or
> >CPLD emulation thereof), and you'd be in business.
> 
> I got mine with the exact same thing in mind. Didn't
> get round to actually building anything yet though.

Ah :-)

If I was to go ahead and design a copro board for this, would anybody
else be interested in one?  I'm guessing the cost for a full kit of
parts would be somewhere in the region of £35.  There wouldn't be any
fine-pitch SMD, so it should be easy to assemble by hand.

p.