Date   : Thu, 11 Aug 2005 02:19:04 +0100
From   : Rob <robert@...>
Subject: Re: 80186 co-pro

At 22:18 10/08/2005, Sprow wrote:


> > >[snip- co pro based on WDC 14MHz 6502]
>
>Without wanting to paint myself into a corner or do Phil out of any work, I
>was planning the following extensions to the ARM copro board proposed earlier
>
>  a) emulate the 6502 tube/65C102 turbo as required in software on the
>     ARM. At 75MHz you should be able to at least achieve 10MHz, allowing

>  b) use a soft 6502 blatted into the spare space in the programmable logic
>     emulating the Tube IC, I've already done some work on a VHDL core which
>
>That way you get two coprocessors for the price of one,
>Sprow.

Hmm... any room in there for a Z80 as well? ;-)

Actually, both are sensible options; I guess it would be fast enough so 
it's possible to write an emulator for any period processor - and after all 
the emulator wouldn't have to worry about any i/o devices apart from the 
tube interface, and that can just be a 'pass through' to the actual 
interface, so the emulator is talking direct to the real beeb host...

[Next task ... emulate a Beeb on an FPGA (well, someone's done most of an 
Atom..) that can talk to a real coprocessor .. lol...]


Rob