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

Title: Help needed installing 26 pin 3" external floppy on 6128 34 pin cable.
Post by: Bignumbas on 12:03, 05 February 17

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. :-\

Title: Re: Help needed installing 26 pin 3" external floppy on 6128 34 pin cable.
Post by: Audronic on 12:19, 05 February 17

@Bignumbas (http://www.cpcwiki.eu/forum/index.php?action=profile;u=1936)

Look Here:-

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

Ray

Title: Re: Help needed installing 26 pin 3" external floppy on 6128 34 pin cable.
Post by: Bignumbas on 12:36, 05 February 17

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 :P

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

Title: Re: Help needed installing 26 pin 3" external floppy on 6128 34 pin cable.
Post by: Bignumbas on 01:11, 06 February 17

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

Title: Re: Help needed installing 26 pin 3" external floppy on 6128 34 pin cable.
Post by: Audronic on 01:29, 06 February 17

Quote from: Bignumbas on 01:11, 06 February 17
Added some more photos of the finished product, now for an ABBA switch.

This works well:-

ABBA switch, the other way (http://www.cpcwiki.eu/forum/amstrad-cpc-hardware/abba-switch-the-other-way/msg48869/#msg48869)

Ray

Title: Re: Help needed installing 26 pin 3" external floppy on 6128 34 pin cable.
Post by: Bignumbas on 02:02, 06 February 17

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.

Title: Re: Help needed installing 26 pin 3" external floppy on 6128 34 pin cable.
Post by: Audronic on 05:22, 06 February 17

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

Ray

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General Category => Technical support - Hardware related => Topic started by: Bignumbas on 12:03, 05 February 17