Date   : Sun, 21 Oct 2007 09:58:57 +0100
From   : kglowe@... (Ken Lowe)
Subject: 12 kB Sideways RAM in a B+?

On Fri, 19 Oct 2007 17:49:59 +0100, Daniel Beardsmore wrote:

> The manual confirms it -- the B+ has 12 kB Sideways RAM. It's not enough
> to
> host a ROM image, being 4 kB short of one page, so why did Acorn only fit
> 12
> kB instead of 16?
>
> The B+ manual doesn't seem to cover it at all. I've never seen Sideways
> RAM
> documented anywhere -- like an OS call to find out how many banks you have
> of it, which they are, and how large each one is. Clearly you'd need
> dedicated calls like this if you can't even rely on having a complete
> bank!

There's some very useful information for the BBC+ in these documents...

http://www.astro.livjm.ac.uk/~bbcdocs/hardware/BPlus128KAdditionalUserInfo.zip
http://www.astro.livjm.ac.uk/~bbcdocs/hardware/BPlus128KAdditionalUserInfo-PDF.zip
http://www.astro.livjm.ac.uk/~bbcdocs/hardware/BPlus64KFittingInstructions2.zip
http://www.astro.livjm.ac.uk/~bbcdocs/essentials/BBCBServiceManual.zip