Date : Fri, 10 Jul 2009 11:33:48 +0100
From : acorn@... (Andy Ford)
Subject: Master Compact Drive Cable
Thanks Chris :)
Have only just seen your message.
I am about 90% of the way there now with this. I looked at the diagram
for connecting a 5.25 drive , which although not quite right gave me a
good clue (pin 1 on the Compact goes to pin 8 on the standard floppy
connector, so it's not fitted at one end as such)
I used a small piece of scrap cable and was able to read an existing
ADFS disc :)
I have since made a good cable up (cutting down a length of floppy
ribbon cable) , however I have the following problem (bear in mind I
have two drives connected, but with just one it is still the same) ,
interestedly the drive light does not work. The cable is identical as
far as I can tell (I re-made it several times until I was sure as its so
easy to get it slightly wrong with these) , new IDC floppy connectors
are expensive and I have about used up all my new spares now.
I cannot actually read any existing ADFS discs now at all, they all
respond with a Broken Directory message. I can format a blank disc fine
though. I have not had chance to test to see if it will read in my B or
Master, I doubt it. At the moment, it seems happy to read and write its
own discs but not anything else.
As a note: the drives are not misaligned. If you pop them into a 1770 B
or a Master, they work properly (apart from the drive light)
I "think" I have it either a pin out (ie: fitted too far across) or I am
missing something (as from all the photographs I have seen, there is a
small link between a couple of pins on the data cable)
Any advice would be greatly appreciated :)
Andy.
c.j.thornley@... wrote:
>
>
> Hi,
>
> Don't know if this will help but find attached the pinout of the
> floppy port. I think the drives have to be set to DS1
>
> Chris
>
>
>
> > Message Received: Jul 08 2009, 09:05 PM
> > From: "Andy Ford"
> > To: bbc-micro@...
> > Cc:
> > Subject: Re: [BBC-Micro] Master Compact Drive Cable
> >
> >
> > Hmm, my signature did not appear for some reason...
> >
> >
> > Andy Ford wrote:
> > > I don't suppose anyone has a picture / diagram to hand of how
> these are
> > > wired do they ?
> > >
> > > I looked at all the pictures I could find but none are clear
> around the
> > > actual wiring area. From what I can see (apart from the cable
> having
> > > less wires) , two pins are joined too.
> > >
> > > I have acquired a Compact with twin drives (both drives do
> work, tested
> > > well with a 1770 B) , but I am struggling to see how to
> actually wire
> > > them in a Compact due to the cable. I have the D plug wired with
> > > (short-ish) length of cable but nothing more. I have tried a few
> > > permutations without much luck :(
> > >
> > > I do know about the DS select switch on the sides of the
> drives ;) , as
> > > a side note: when I used them on the 'B' , the drive light did
> not work
> > > at all, although when I (accidentally!) plugged the cable in
> upside
> > > down, it did permanently illuminate (as expected) so I'd guess
> they are
> > > internally wired slightly differently anyway, maybe specially
> produced
> > > for Acorn ?
> > >
> > > Any advice,hints,tips or a diagram would be most welcome :D
> > >
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