Date   : Sat, 17 Oct 2009 02:00:47 +0200
From   : rick@... (Rick Murray)
Subject: ROM upgrades on the cheap

John Kortink wrote:

> It's not complicated, and there's more than one way.
> Mine (which I'm actually using in my 'work' Beeb) is
> this :
> http://web.inter.nl.net/users/J.Kortink/rewire.txt

Reading that now.

I do have one question - the top says "If you rewire all 4 of your 
sideways ROM sockets, you will be able to load and subsequently use 8 
different sideways ROM images at the same time."

Sounds pretty flexible, certainly for developing EPROM images. But, um, 
if you rewire all four sockets to be SRAM, and the fifth holds the 
MOS... how will you be able to load anything INTO the sideways ROM? 
Surely you'd need to make do with only six and have the other slot 
containing DNFS or whatever, plus any EPROM that has some code to do the 
*SLOAD?


Right. Bookmarked that.


Aaaargh! I remember that digitiser! God, I almost fell over dead seeing 
a design for an Acorn podule in Elektor. I might even have the pages 
around here someplace on the off chance I'd ever get around to building it.



> See also the thread 'Sideways RAM designs' on this
> mailing list (starting 27th May 2003).

If anybody is looking, it starts here:
   http://mdfs.net/Archive/BBCMicro/2003/05/27/172442.htm


Best wishes,

Rick.

-- 
Rick Murray, eeePC901 & ADSL WiFI'd into it, all ETLAs!
BBC B: DNFS, 2 x 5.25" floppies, EPROM prog, Acorn TTX
E01S FileStore, A3000/A5000/RiscPC/various PCs/blahblah...