Date   : Wed, 18 Mar 2009 22:28:07 +0100 (GMT)
From   : johan@... (Johan Heuseveldt)
Subject: Ugly beeb hacks

Hi,

On Tue 17 Mar, me@... wrote:
> On 17 Mar 2009, at 16:02, Rob wrote:

> > It's a Master .. I'd hazard a guess that it's to do with redirecting
> > the ROMSEL on the sockets.. I'm sure I saw something (more neater!)
> > described so as to use the GoMMC in a different socket, and so allow
> > the use of the RAM banks that it normally wipes out..
> 
> Bingo.
> 
> The GoMMC sits in the 6+7 slot (and has to for exciting reasons), but  
> that wipes out two banks of sideways RAM. You can move the jumper to  
> convert 6+7 back into RAM and perform the ugly hack in the photo, and  
> the GoMMC magically reappears in bank 8.

[snip: still a few problems]

As I'm in need for slot 8 (Most Beebs are Econeted) I went for
another route. I added a chip within a 28-pin socket, did
something with the signals for ROMs and MegaROM, so that GoMMC
is slotted to slots 0/1 or 2/3.

Recently I got a decent camera, but can't get the pictures from
it. Otherwise I would have put some pictures on my site, and
would go for the prize draw as well! :-)

I did several tests; at one points both worked, but currently
it is only one of them. I think that's because the encoded signals are
slightly different for both.


It's quite a pleasure to have slot 8 free and all four RAM banks as well!


Greetings,
Johan

-- 
Johan Heuseveldt <johan@...              >
  aka  waarland

  The best place is a Riscy place

Even great wizards turn pale at the mere mention
of the name Yog Sothoth.