[BBC-Micro] Master Compact Drive Cable

Andy Ford acorn at acford.co.uk
Fri Jul 10 11:33:48 BST 2009


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 at coolrose.fsnet.co.uk 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 at lists.cloud9.co.uk
>     > 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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>     > > bbc-micro at lists.cloud9.co.uk
>     > > http://lists.cloud9.co.uk/mailman/listinfo/bbc-micro
>     > >
>     > >
>     >
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