Date   : Sun, 02 May 2004 23:01:55 +0100
From   : "Christopher Thornley" <c.j.thornley@...>
Subject: Re: B+ Upgrades

 Hi,
Please could you send me a picture of the track side of the board.
I has acquired a BBC+ 64k machine and would like to upgrade it to 64k swr
RAM but these interface or chip are not available any more.
I would like to build an equivalent unit but I need to you the original
circuit diagram and which pins on the connector it was connected to.

Thanks
Chris


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-----Original Message-----
From: Majordomo List Manager [mailto:majordomo@...] On Behalf Of
gARetH baBB
Sent: 30 April 2004 22:20
To: bbc
Subject: Re: [BBC-Micro] B+ Upgrades

On Fri, 30 Apr 2004, Chris Thornley wrote:

> How do you upgrade a BBC+ to 64k of side ways ram? Do you use an 
> external

The B+128 was just a +64 with extra bits, aka:

http://www.503.gink.org/x/02550_b_plus_freak_board.JPG

> Into its ROM Sockets? Would this ram only be used for SWR ROMS or 
> could you shadow it like you could do with the Watford or ATPL board 
> which use to be available in Watford electronics?

Unsure what you mean, B+ already has shadow RAM, this is SWR.

> Did the B+ have the same Basic II ROM as the BBC B?

Yes.

> Was the 1770 DFS different than the Master version and did acorn 
> produce an

Yes.

> ADFS for the machine?

Normal BBC ADFS 1.30.