Date   : Sat, 15 Oct 2005 13:51:37 +0100 (BST)
From   : Greg Cook <debounce@...>
Subject: Opus 2791 board / EDOS 0.4

Hello all,

I'm hoping someone is able to shed light on the WD2791 floppy disc
controller board produced by Opus.  This is the older type with a 40
pin IC (WD2791PL-02) plus a 40 pin header for fitting in IC78 on the
BBC B.  Pictures and info:

http://www.8bs.com/see/opusboard1.jpg
http://homepages.tesco.net/~rainstorm/bmem2.jpg
http://homepages.tesco.net/~rainstorm/edos-notes.txt

- Does anyone remember installing this type of board, or the DFS that
  went with it?

I'm not convinced that my "Opus EDOS 0.4" is original.  AFAICT, the
simpler WD1770 board and the accompanying DDOS 3.45, were also produced
in 1984.  The DFS ROMs have radically different builds.

- Was EDOS brand new when written, a workalike or descended from DDOS
  or Challenger?
- Were DDOS or Challenger brand new, workalikes or descended from EDOS
  or one another?
- How come EDOS is virtually bug free at version 0.4?
- Is EDOS an official Opus release?

If any reader knows in detail the history of the Opus disc interfaces
and where EDOS fits in, I would appreciate any information received.

Many thanks,

Greg Cook
debounce@...
http://homepages.tesco.net/~rainstorm/




               
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