Date   : Mon, 29 Aug 2005 23:48:52 +0100
From   : "Ian Wolstenholme" <BBCMailingList@...>
Subject: Re: Acorn OS 160K ??

Yes, according to the Service Manual, BASIC can either live at 0/1
or 14/15 depending on what links you set.  There doesn't appear to
be a socket for 12/13 on the motherboard so presumably this would
appear on the 64K RAM board along with the spare two which BASIC
isn't using.

I've tried SRAM in all the spare slots but only ever get 64K.

Best wishes,


Ian

----- Original Message -----
From: Tom Seddon
To: 
Cc:   bbc-micro@...
Sent: Mon, 29 Aug 2005 22:44:04 +0100
Subject: Re: [BBC-Micro] Acorn OS 160K ??

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.)

 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

Ian Wolstenholme wrote:
> Ooh, I'll try that.  I presume that's how you get up to 160K then with
> 2 x 16K in the normal ROM slots and the 64K daughter board.
> 
> But which are slots 12 & 13?  I've just looked in the B+ service manual
> (p.15) and it mentions all of them except 12 & 13!!
> 
> Best wishes,
> 
> Ian
> 
> ----- Original Message -----
> From: Tom Seddon
> To: 
> Cc:   bbc-micro@...
> Sent: Mon, 29 Aug 2005 19:22:44 +0100
> Subject: Re: [BBC-Micro] Acorn OS 160K ??
> 
> Ian Wolstenholme wrote:
> 
>>Has anybody tried this before or got a Beeb to come up with a memory
>>message other than 64K or 128K?
> 
> 
> Put sideways RAM in slots 12 and 13 of your B+, and it will come up with 
> "Acorn OS 96K"...
> 
> --Tom
> 
>