Date   : Sat, 13 Sep 2008 22:48:22 +0100
From   : mfirth@... (Michael Firth)
Subject: Sideways RAM rom ?

----- Original Message ----- 
From: "Phill Harvey-Smith" <afra@...>
To: <bbc-micro@...>
Sent: Saturday, September 13, 2008 9:34 PM
Subject: [BBC-Micro] Sideways RAM rom ?


> Hi,
>
> My first post to the list so please be gentle with me :)
>
> I've just updated my design for a fully populated rom board (using a
> 27C010/020 or flash equivelent) for the BBC B, to include a block of
> RAM, to be used as sideways ram, however the standard BBC B does not
> come with sideways ram commands built into the machine. Can someone
> sugest a suitable set of routines for use in such a setup.
>
> Basically my board at the moment will have the roms in banks 8-15, and
> the ram in banks 0-7. My 3 BBC Bs also have Watford 1770 DDFS (one
> original and 2 clones :)  ), in them which I'd like to continue to use
> if at all possible.
>
> Cheers.
>
> Phill.
>
The later standard was to use the Acorn 1770 DFS which came with a set of 
SRAM commands, and which was also the provided way to load the SRAM on the 
Master.

I've just uploaded the Utilities ROM I mentioned in another post to 
http://www.firths.org/bbc/UtilsROM, this ROM allows the use of the SRAM 
commands on a machine that doesn't have the 1770 DFS installed. It does, 
however, increase PAGE by &200.

As alternatives, ACP ADT or ARM can load to SRAM, and doesn't require any 
workspace, or there are many disk-based utilities that can be used (back in 
the 80s, I wrote my own set that could handle Acorn, Solidisk and Watford 
SRAM, and would hunt for an available slot for the ROM)

Michael