Date   : Mon, 08 Aug 2005 21:45:56 +0200
From   : John Kortink <kortink@...>
Subject: Re: 80186 co-pro

On Mon, 08 Aug 2005 19:44:10 +0100, Phil Blundell wrote:

>On Sun, 2005-08-07 at 11:17 +0100, Phil Blundell wrote:
>> Another project I've wondered about occasionally would be building a
>> high-speed 6502 second processor based on an FPGA and one of the
>> synthesizable 6502 designs out there on the web.  I suppose one ought
to
>> be able to run this kind of thing at 20MHz or so, which might be cute.
>
>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).

>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.


John Kortink


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