Date   : Sun, 15 Mar 2009 20:29:09 -0000
From   : mfirth@... (Michael Firth)
Subject: BBC B+ 64K upgrade

----- Original Message ----- 
From: "Phill Harvey-Smith" <afra@...>
To: <bbc-micro@...>
Sent: Sunday, March 15, 2009 6:51 PM
Subject: [BBC-Micro] BBC B+ 64K upgrade


> Michael Firth wrote:
>> On the same site, are some pictures of a B+ with the 64K upgrade, at:
>> http://bbcmicro.net/old-8bs/see/BBCBplusanddaughter1.jpg and
>> http://bbcmicro.net/old-8bs/see/BBCBplusanddaughter2.jpg.
>>
>> As you can see, there isn't much visible, as all the flying leads apart
>> from one go under the PCB.
>
> On a side note does anyone have the schematic/wiring instructions for
> the B+ 64K upgrade ? I'd quite like to upgrade my B+ to 128K.
>
I haven't found the schematic yet, but the installation instructions are at:
http://www.nvg.ntnu.no/bbc/doc/BPlus64KFittingInstructions.zip,
and the additional user instructions are at
http://www.nvg.ntnu.no/bbc/doc/BPlus128KAdditionalUserInfo.zip

Given the hassle of installing the Acorn upgrade, and the fact that you need 
a bespoke PCB that's no longer produced, I've devised an alternative method 
of doing the upgrade, that's documented here:

http://www.firths.org/bbc/my_b+128k.html

It is compatible with the Acorn upgrade, and has the bonus of giving you an 
extra 2 SWR banks too (effectively giving you a B+ 160K)

Regards

Michael