Date   : Fri, 10 Nov 2006 20:00:47 +0000 (GMT)
From   : debounce@... (Greg Cook)
Subject: Solidisk 1770 BBC B upgrade (first edition) Drive 1

On Fri, 10 Nov 2006 14:29:20 +0000 (WET), Peter Coghlan
<PCOGHLAN@...> wrote:

[quoting "adam colley"]
> >Finally got the solidisk upgrade sort of working, however the
> machine
> >it's now in previously had a (defunct) Opus DDOS upgrade fitted,
> after
> >trying 3 different Solidisk ROMs got one that sort of works in that
> >the first drive works fine, I can format double density disks etc.
> >
> >Unfortunately when I try to access the second drive, both lights
> come
> >on and disk fault 18 appears... this is especially troublesome as
> the
> >second drive is a 3.5" used for transferring files to and from the
> PC
> >with Omniflop...
> >
> 
> Hi Adam,
> 
> Do both lights come on when you use the first drive too? If so, maybe
> both drives are jumpered to the same drive number?
> 
> If this is not the case, try swapping the drive numbers and see if
> the second
> drive then works and the first one fails. If the software is not
> quite right,
> it could be trying to select the drive by writing to some funky drive
> select
> register which isn't present on your hardware.

Perhaps the ROM's found the right floppy controller in the right place,
but it's using the wrong protcol for the control register.  Does
anything different happen using drives 2 and 3, or single density? Will
it read DFS discs created on another machine?

Regarding the red headers, they're perfectly standard.  The one in IC
87 replaces the data separator and the other one is to supply an 8 MHz
clock to the 1770.

HTH,

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


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