Date   : Fri, 16 Oct 2009 01:29:03 +0200
From   : kortink@... (John Kortink)
Subject: ROM upgrades on the cheap

On Fri, 16 Oct 2009 01:11:24 +0200, Rick Murray <rick@...>
wrote:

>I am hoping somebody has already done this, so I can pick your brains 
>instead of poring over the circuit diagram armed with datasheets...
>
>With reference to:
>   http://www.retroclinic.com/acorn/swr/swr.htm
>
>I am not that interested in SRAM, but the ability to have IC100 and 
>IC101 take up to four ROM images in a larger EPROM.
>
>[...]

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

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


John Kortink

-- 

Email    : kortink@...         
Homepage : http://www.inter.nl.net/users/J.Kortink

Those who can, do. Those who can't, manage.