Date   : Tue, 30 Aug 2005 00:12:00 +0100
From   : "Ken Lowe" <kglowe@...>
Subject: Re: Acorn OS 160K ??

Tom Seddon wrote:
> Well... I must admit, I don't know!
>
> I got the slot numbers from Tom Walker's B-em, and put equivalent settings 
> in model-b as a default, so I've only ever seen this behaviour under 
> emulation. (It turns out that if (from the software point of view) you get 
> RAM banks paged in when writing 12 and 13 to ROMSEL then you get the 96K 
> message.)

Have a look at my post here for some further info on B+ RAM Banks:
http://www.stairwaytohell.com/forums/viewtopic.php?t=450
Basically, DFS 2.26 expects to see RAM in banks 0, 1, C & D. Make any or all 
of these RAM banks read only, and the reported memory will change.

> From what I recall when reading about the B+ -- though this was a good 
> couple of years ago now -- the ROM slot allocations were a bit "funny", in 
> that you didn't have free rein over what went where, and BASIC was fixed 
> in both slots 0 and 15 (or something like that). So it's perfectly 
> possible that to get this in reality you'd need some kind of hardware 
> widget, maybe even something rather specific, that was never produced...
>
> --Tom

Not sure about that. I don't have a real B+ to see what is really held in 
these 4 slots.

Ken.