Date   : Sat, 06 Aug 2005 22:54:21 +0100
From   : Phil Blundell <philb@...>
Subject: Re: 80186 co-pro

On Sat, 2005-08-06 at 19:53 +0000, Jules Richardson wrote:
> On Sat, 2005-08-06 at 20:20 +0100, Phil Blundell wrote:
> > Thanks.  I'll look around for it.
> > 
> > I also found a couple of partially-depopulated 80286 external
> > coprocessor boards.  
> 
> Bloody hell, those are rarer than hen's teeth. No ROMs whatsoever on
> them? The Master 512 copro ROMs *should* work though; that's what my
> board has. I've got ROM dumps of what's in my machine somewhere if
> needed.

Oh, right, cool.  No, I don't seem to have any 80286 ROMs at all, but
I'll try the ones from the Master 512 board.  

> Photo of assembled board I can do (not today, but probably tomorrow;
> means digging my ABC310 out of the cupboard). Circuit diagram I got
> halfway through drawing a while ago but haven't finished it yet...

Great.  I guess I I mostly need to know what sort of DRAMs it takes, and
which way round the two ROMs go.

> I think that's probably for a x87 copro - there's nothing in that socket
> on my machine's board. 

Aha.  That'd make sense, I guess, though it seems a bit odd that it's
way over there rather than on the east side of the board with the CPU.

p.