Date   : Sun, 07 May 2006 16:33:52 +0100
From   : jgh@... (Jonathan Graham Harston)
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.
 
-- 
J.G.Harston - jgh@...                - mdfs.net/User/JGH
Taxation is like dairy farming. You have to extract the maximum amount of
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