Date   : Wed, 20 Sep 2000 20:55:56 +0100
From   : "Julian Stenning" <julian_stenning@...>
Subject: Re: 2nd Processors (Again)

Hi Mike,

thanks for the reply.  The diags on both beebs I have report the 2nd
processor as not present :(

The first bbc is a issue 4 with a solidisk 2meg 128 board fitted and a
solidisk 1770/8271 dual disk controller (issue 2). Roms fitted to this are
acorn dnfs 1.2, acorn adfs 1.3 and solidisk 1770 dfs 2.12.

The other bbc is a plain issue 7 board with 8271 controller. The only rom is
acorn dnfs 1.2. It's becuase this machine is so 'plain' I suspect the 2nd
processor.

One other question - *help returns 6502 TUBE 1.10 - is this the usual
version? It's just the rom on the 2nd processor board has '6502 boot rom iss
1.1' written on it in biro.

Any other ideas?

Regards,
Julian.



----- Original Message -----
From: "Mike Tomlinson" <mike@...>
To: <bbc-micro@...>
Sent: Wednesday, September 20, 2000 5:50 PM
Subject: Re: [BBC-Micro] 2nd Processors (Again)


> In article <F136SXCWV8S0g9S83w400003292@...>, Julian Stenning
> <julian_stenning@...> writes
> >Hi All,
> >
> >does anyone know of a method of testing 6502 2nd processors?
>
> Get this diagnostics disc image:
>
> http://jasper.org.uk/diags.zip
>
> transfer the files onto a BBC disc and boot it.  Option G is the Watford
> Diagnostics, which has a 6502 second processor test.
>
> A common failure in the earlier second processors was the Ferranti 9C
> ULA chip, but this usually resulted in the Beeb refusing to boot at all
> with the second processor connected.
>
> Some ROMs can cause trouble with games.  What ROMs do you have
> installed?
>
> Mike
>
> --
> Mike Tomlinson
> mike@...
>
>