Date   : Sun, 07 May 2006 17:38:01 +0100
From   : "Mike" <profpep@...>
Subject: Re: 1 MHz Bus backplane

> Jules Richardson <julesrichardsonuk@...> wrote:
> > Further to last email to the list, I've just unearthed a CU board called
a
> > "beebex-1" which appears to do exactly the task you mention - it's got a
> > 34-way trailing ribbon cable + IDC socket, and a backplane board
containing
> > some control logic and four Eurocard connectors.
>
> Examining the circuit diagram confirms my suspicion that &FCFF was
> only the low byte of a multi-byte paging latch.
>
> &FCFF - b0-b7 of paging latch, backplane address A8-A15
> &FCFE - b8-b15 of paging latch, backplane address A16-A23
>
> meaning that is could continue into &FCFD, &FCFC, etc.
>
I think this is what CUBE did on their EuroCard BBC stuff  - I think they
went to 24 bit addressing, though I'd need to get out the manual and check.

--
||\/||ike