Date   : Fri, 04 Aug 2006 08:48:43
From   : gARetH baBB <hick.bbc@...>
Subject: Re: Electron cartridge interface

On Thu, 3 Aug 2006, Steve O'Leary wrote:

[please don't post using HTLML]

> What was special about ROM socket 13 that it was mapped to the cartridge
> slot and how did this work if you had hardware in both cartridge slots
> that looked at the ROM 13 line ? it couldn't use both ? Or was this

You had two conflicting ROMs ...

ROM 13 was just a high priority socket, both in terms of vector claims
etc. and speed of access (it only took a single write of FE05 to page in
ROMs 8-15).

The only thing which springs to mind which used it was the Projection
Expansions sound upgrade.