Date   : Tue, 06 Mar 2007 09:44:04 -0000
From   : christopher.whytehead@... (chris whytehead)
Subject: Some Beeb addons

> -----Original Message-----
> From:
> bbc-micro-bounces+christopher.whytehead=ntlworld.com@...
> [mailto:bbc-micro-bounces+christopher.whytehead=ntlworld.com@...
> 9.co.uk]On Behalf Of Kris Adcock
> Sent: 05 March 2007 22:32
> To: bbc-micro@...
> Subject: Re: [BBC-Micro] Some Beeb addons
>
>
> chris whytehead wrote:
> > Hi
> >
> >> There's a Watford Electronics 32K RAM card, with an accompanying ROM.
> >> The board holds the 6502 processor - there's a short ribbon cable to
> >> connect it where the 6502 would normally go. Does this RAM card add
> >> another 32K (making it a 64K machine) or is the extra 32K used as
> >> Sideways RAM?
> >
> >> Does anyone have scans of the docs for these items?
> >>
> > I have just added the Watford 32K RAM card manual (and
> addendum) to Chris's
> > Acorns, in case you haven't got a copy from someone else.
> >
> > http://acorn.chriswhy.co.uk/docs/Watford/WE_32KRAMcard.pdf
> > http://acorn.chriswhy.co.uk/docs/Watford/WE_32KRAMcardAdd.pdf
> >
>
> Thank you very much! Exactly what I needed!
>
> Incidentally, I've been reading the Wikipedia entry for the B and the B+
> - and it seems that the WE card adds exactly the same extra RAM as if
> you traded-in a B for a B+. Are there any other differences (the article
> also says that Bus had floppy controllers fitted as standard), or does
> this card effectively make my B a B+?
>
According to the Acorn Brochure advertising the B+, the differences are:
- 6512 processor
- 64K RAM 48K ROM (*)
- Disc interface (WD1770)
- 6 ROM sockets
- Improved buffering (*)
- New DFS commands (DFS 2.10)
- Shadow screen (*)
- Fully Compatible OS (MOS 2.00)

(*) are items covered 32K RAM card.

You can get a 1770 Disc interface upgrade for a BBC B with DFS 2.10. You can
probably get ROMs) to add any missing MOS features. But I am not sure if you
can add a 6512 processor.

Chris