Help needed installing 26 pin 3" external floppy on 6128 34 pin cable.

[Bignumbas]

I am trying to use a 3" floppy as a second drive on a 6128.
I have it all mounted and powered but I am having trouble with the 34 pin to 26 pin conversion.
I cannot locate the pinouts for a 3" drive either.
I assume it should be the reverse of Bryce's internal 26 to 34 pin adapter.
I can run a 3.5" drive no problems.
I have the cable plugged in with the 180 twist that's why the red line is on the no 1 pin but on the 6128 it is on pin34, thats the only way I get 3.5" drives to work.
Amstrad reversed the pinouts from standard on the 6128 with even numbers being gnd, and odd numbers data, why?
I think this is where my problem lies, I need the pinouts of the drive 26 pin socket
All I get with the 3" drive is "disk missing".
There is no drive select jumper for these drives that I can find.
Can someone please tell me what is wrong or needed.   

[Audronic]

@Bignumbas


Look Here:-


http://www.cpcwiki.eu/index.php/DIY:Floppy_Drives


Ray

[Bignumbas]

OK, Solved it.
Finally found this page after posting: http://pcwpage.co.uk/making-a-data-cable-for-a-3-to-a-standard-3-5-drive/
I had to crossover pin 4 and pin 6 to get drive select to work.
Happy chappy now 


Will post some photos off the completed ext drive tomorrow, its bed time now.

[Bignumbas]

Added some more photos of the finished product, now for an ABBA switch.

[Audronic]

Added some more photos of the finished product, now for an ABBA switch.

This works well:-


ABBA switch, the other way


Ray

[Bignumbas]

Yes its fairly simple to do I have been looking at that one. My problem with these mods is hacking into the original case to fit switches. 


The CPC case is one of the worst  with not much lower case to fit things to.


I am putting in a reset button at the moment and am using the hole left by not having the 12v cable out the back.

[Audronic]

JayCar have some small switches :-
SPDT Sub-Miniature Toggle Switch - Solder Tag
JayCar # CAT.NO: ST0300    $2.95

Ray