Date   : Mon, 25 Jul 2005 21:35:46 +0000
From   : Jules Richardson <julesrichardsonuk@...>
Subject: Re: [Bulk] Re: Re: ARM copros, speech cartridges, real

On Mon, 2005-07-25 at 22:29 +0100, BeebMaster wrote:
> Multiple second processors /co-processors must have been a possibility
> in the long distant past as the Master Reference Manual description for the
> *X command seems to hint this

Well I have a feeling that the Tube was designed to be a bus with
multiple devices on it, but the reality was that it had trouble coping
for some reason. I'm just not sure if that was for software reasons or
some kind of fault with the basic hardware.

>From memory, all the copros have things like bus terminating resistors
soldered straight to the PCB, as though they weren't meant to be used
alongside others on the same bus. Yet connecting both a 6502 and Z80
copro to the same machine doesn't seem like that far-fetched a thing to
expect people to want to do...

cheers

Jules