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Old 06 December 2012, 14:38   #1
SilverZguru
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Normal 34-pin floppy drive on external 26-pin roctec

Hi all!
This is my first post here, so sorry if this is on wrong thread or something...
but yeah, I have tried few pinouts now to install normal (modified to support READY signal and jumper set to DS0) 34pin pc drive to my slimline external fdd, which has 26pin connector, but without any kind of success.

I use normal PC power supply to give the +12v for fdd and resoldered 26pin connector to 34pin with this pinout: http://www.king27.freeserve.co.uk/3....es/citizen.htm

All I get is "DF1:BAD, DF2:BAD and DF3:BAD" on workbench. The drive does click few times when loading Workbench, but everything else is wrong.

I have really no idea anymore what to do, and because the original 26-pin Citizen drive from my external drive is faulty (not broken belt, because drive is running well, just giving some READ/WRITE errors all the time), I don't have any external drive for now.

Thanks all!
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Old 06 December 2012, 22:40   #2
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Quote:
Originally Posted by SilverZguru View Post
I have tried few pinouts now to install normal (modified to support READY signal and jumper set to DS0) 34pin pc drive to my slimline external fdd, which has 26pin connector, but without any kind of success.

I use normal PC power supply to give the +12v for fdd and resoldered 26pin connector to 34pin with this pinout: http://www.king27.freeserve.co.uk/3....es/citizen.htm
Note that most 3½-inch 34-pin PC floppy drives don't have an internal connection to the the +12V PSU line, so your provision of a separate +12V line is probably not required.

First, please provide exact details of the make and model of the 3½-inch PC floppy drive and your modifications to support the READY signal and DS0 jumper setting.

Incidentally, have you checked that the modified drive works correctly when connected to the internal floppy drive port of your Amiga?

Second, please provide exact details of the pin-to-pin connections you have made between the Roctec's 26-way floppy ribbon cable and the new 34-pin floppy connector.

Without this information, no-one here will be able to help you.
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Old 06 December 2012, 23:22   #3
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i have changed the citizen with a slim floppy from notebook and work fine but is very small for case of rocteck

the electronic card on rocteck have one chip for adapter signal from floppy standard 26 pin, you need solder 34 pin before this chip and modify the floppy standard 34 pin for compatibilty with amiga

if you need more info, i am here
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Old 07 December 2012, 16:28   #4
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Quote:
Originally Posted by prowler View Post
Note that most 3½-inch 34-pin PC floppy drives don't have an internal connection to the the +12V PSU line, so your provision of a separate +12V line is probably not required.

First, please provide exact details of the make and model of the 3½-inch PC floppy drive and your modifications to support the READY signal and DS0 jumper setting.

Incidentally, have you checked that the modified drive works correctly when connected to the internal floppy drive port of your Amiga?

Second, please provide exact details of the pin-to-pin connections you have made between the Roctec's 26-way floppy ribbon cable and the new 34-pin floppy connector.

Without this information, no-one here will be able to help you.
Sorry, I meant +5v... my mistake.
Okay, so my floppy drive I modified is Panasonic JU-257A605P. I used Jope's tutorial how to mod it: http://eab.abime.net/showthread.php?t=30944
This model was easier to mod than Jope's, coz this has DS0-DS1 switch.

And, I have tested this fdd in my Amiga's internal port (DF0) and it worked perfect (including the ready signal).

About the pinouts, I used this table for 26pin: http://www.king27.freeserve.co.uk/3....es/citizen.htm

and this for 34pin:
http://www.martinruss.com/sy99adapter.html (I have tried the 26pin one on this site too, but it didn't work.)

So all I did was that I connected every wire that upper 26pin pinout link says and then compared to the 34pin table. I'm pretty sure that the table for 26pin is completely wrong coz its for Amstrad. But I just can't find one for external Amiga floppy drive.


And for cpiac64:

How did you add support for READY signal on that drive? I have 2 laptop 26pin drives lying on my desk, but can't know how to put them support READY.

Last edited by prowler; 07 December 2012 at 22:33. Reason: Fixed link.
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Old 07 December 2012, 22:20   #5
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Thanks for completing the picture, SilverZguru.

Quote:
Originally Posted by SilverZguru View Post
Sorry, I meant +5v... my mistake.
Okay, so my floppy drive I modified is Panasonic JU-257A605P. I used Jope's tutorial how to mod it: http://eab.abime.net/showthread.php?t=30944
This model was easier to mod than Jope's, coz this has DS0-DS1 switch.

And, I have tested this fdd in my Amiga's internal port (DF0) and it worked perfect (including the ready signal).
Okay, so far, so good.

This confirms that the drive is perfectly compatible, and so the solution to the problem must be found by looking again at the interface between the 26-way ribbon cable and the 34-pin connector.

Quote:
Originally Posted by SilverZguru View Post
About the pinouts, I used this table for 26pin: http://www.king27.freeserve.co.uk/3....es/citizen.htm

and this for 34pin:
http://www.martinruss.com/sy99adapter.html (I have tried the 26pin one on this site too, but it didn't work.)

So all I did was that I connected every wire that upper 26pin pinout link says and then compared to the 34pin table. I'm pretty sure that the table for 26pin is completely wrong coz its for Amstrad. But I just can't find one for external Amiga floppy drive.
I'll study that information and then we'll see if my wiring diagram matches yours.

Last edited by prowler; 07 December 2012 at 22:34. Reason: Fixed link in quote.
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Old 08 December 2012, 00:52   #6
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@silver, test with drive for pc original not modded, make only conversion from 34 to 26 pin

my small drive is an mitsubishi mf355h-343mw
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Old 08 December 2012, 11:16   #7
SilverZguru
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Thanks alot! People are much more kinder here when nobody doesn't manage to answer anything helpful at Amiga.org.

ps. I attached a pdf which I did to show what I exactly soldered.
Attached Files
File Type: pdf My pinout.pdf (130.5 KB, 1153 views)
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Old 08 December 2012, 21:55   #8
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Quote:
Originally Posted by SilverZguru View Post
Thanks alot! People are much more kinder here when nobody doesn't manage to answer anything helpful at Amiga.org.
We try our best.

Quote:
Originally Posted by SilverZguru View Post
ps. I attached a pdf which I did to show what I exactly soldered.
I appreciate that, Silver. Thanks!

I will be very busy over the next few days, but I won't forget about this. I'll try to have a look tomorrow.
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Old 09 December 2012, 21:22   #9
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Hi Silver,

Here is my suggestion for the wiring, based on information at these web addresses:
http://pinouts.ru/Storage/InternalDisk_pinout.shtml
http://www.l8r.net/technical/t-diskdrive.shtml

Code:
26-pin  Conne      34-pin               Signal
cable   cted?     interface     Name            Description
1        No                      VCC                +5V
2        Yes          8        /INDEX              Index
3        No                      VCC                +5V
4        Yes         10         /DS0           Drive Select 0
5        No                      VCC                +5V
6        No                                    Not Connected
7        Yes         12         /DS1           Drive Select 1
8        Yes         34         /RDY      Drive Ready/Disk Changed
9        No                                    Not Connected
10       Yes         16        /MTRON           Motor Enable
11       No                                    Not Connected
12       Yes         18         /DIR             Direction
13       Yes         13          GND               Ground
14       Yes         20         /STEP               Step
15       Yes         15          GND               Ground
16       Yes         22        /WDATA            Write Data
17       Yes         17          GND               Ground
18       Yes         24        /WGATE   Write Gate/Floppy Write Enable
19       Yes         19          GND               Ground
20       Yes         26         /TRK0             Track 0
21       Yes         21          GND               Ground
22       Yes         28         /WPT            Write Protect
23       Yes         23          GND               Ground
24       Yes         30        /RDATA            Read Data
25       Yes   25,27,29,31,33    GND               Ground
26       Yes         32        /SIDE1            Head Select
The differences between this schematic and yours is due to the differences between the 34-pin tables for the Amiga floppy drive connections on the links above and on the link you referenced:
http://www.martinruss.com/sy99adapter.html
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Old 11 December 2012, 19:20   #10
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Thanks so much Prowler!

But when tested, it gave me exactly same results as my first pinout
And now my test-Amiga shows "DF1:BAD, DF2:BAD and DF3:BAD" even if the external floppy drive isn't connected
Maybe it's impossible to get it working... and I don't want to break my other fully working Amiga.
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Old 11 December 2012, 20:35   #11
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Quote:
Originally Posted by SilverZguru View Post
Thanks so much Prowler!

But when tested, it gave me exactly same results as my first pinout
And now my test-Amiga shows "DF1:BAD, DF2:BAD and DF3:BAD" even if the external floppy drive isn't connected
Hmm... If the Amiga is showing "DF1:BAD, DF2:BAD and DF3:BAD" - even with no external floppy drive connected, then it sounds like the external drive port may be faulty.

Quote:
Originally Posted by SilverZguru View Post
Maybe it's impossible to get it working... and I don't want to break my other fully working Amiga.
I'm sure I have a Rotec external Amiga floppy drive myself somewhere - with a broken drive mechanism IIRC (the drive belts usually snap). If I can find it - and it has a 26-pin interface - I'll try some experiments with it and a 34-pin drive.
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Old 12 December 2012, 18:44   #12
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That would be awesome Prowler!
I'm so stuck now that I really need some advices...

But thanks again!
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Old 13 December 2012, 14:06   #13
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I am also interested in this, I'm thinking it would be cool to get a slimline floppy working as internal DF0 and have room for a slimline CD ROM on the right-hand side as well, with a few case mods.
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Old 15 December 2012, 10:01   #14
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I tried to connect 26pin micro floppy drive from laptop. Now its better, I only get "DF1:BAD" (using my other amiga which doesnt have the faulty port), but the drive doesnt click or do anything...

cpiac64, didnt you get a normal laptop drive working? Can you tell me exactly what you did? Thanks!
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Old 15 December 2012, 21:23   #15
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i add a photo soon
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Old 15 December 2012, 22:05   #16
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Quote:
Originally Posted by SilverZguru View Post
I tried to connect 26pin micro floppy drive from laptop. Now its better, I only get "DF1:BAD" (using my other amiga which doesnt have the faulty port), but the drive doesnt click or do anything...
What happens if you use my schematic for the 34-pin wiring, but leave the /DS1 signal disconnected (26-pin cable pin 7, 34-pin interface pin 12)?

I'm not familiar at all with the 26-pin floppy interface, and I haven't had a chance to look for my Roctec external drive yet, but I'm just wondering if the Roctec's internal electronics are converting the Amiga's /DS1, /DS2 and /DS3 signals into binary coded /DS0 and /DS1 signals at the Roctec's floppy disk drive unit end.

If this were the case, only /DS0 would need connecting to your 34-pin replacement drive, if the Roctec is the first external drive in the chain.

Last edited by prowler; 15 December 2012 at 22:17.
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Old 16 December 2012, 17:39   #17
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Click image for larger version

Name:	IMAGE_116.jpg
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ID:	33469

pin one is red wire at sx
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Old 17 December 2012, 00:13   #18
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I found my Roctec Amiga external floppy drive earlier this evening.

It's a slimline drive with an internal case height of 19mm. It has a belt-driven Citizen UODC-68A 5V, 420mA drive mechanism. Power and data connections are made via a 26-pin ribbon cable from a pcb interface with ON/OFF switch and 23-pin D-Type passthrough connector accessible from the rear panel.

The pcb interface has the identifying legend RF382C-A, which is the Roctec drive model number. The board carries two ICs - HD7404P TTL hex buffer and 18CV8PC-25 CMOS programmable electrically erasable logic device.

I had thought this drive didn't work when I tried it. I got it cheap from an eBay seller, so I wouldn't be surprised. However, the drive belt is intact, so I'm not so sure now.

Anyway, I can have a good play with it now.

Last edited by prowler; 17 December 2012 at 00:33. Reason: Typo.
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Old 17 December 2012, 01:38   #19
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Hey, I've just found these :
http://www.king27.freeserve.co.uk/3.....5_general.htm
http://www.king27.freeserve.co.uk/3..../cable8256.htm

The difficulties of interfacing 34-pin drives with the 26-pin interface may be pinpointed in the ready signal and solutions paragraphs on those pages. We shall see...
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Old 17 December 2012, 17:12   #20
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Thanks a lot Prowler! That's something interesting to read. And yes, I knew that there will be some compatibility problems with 26pin and 34pin interfaces.

And Cpiac64, thanks for the picture! Do you have exact pinout or something how you did that. It really looks nice As I told, I put those wires, but the drive is silent when I try to use it with amiga

EDIT:
I took picture from my connection of Roctec 26-pin to 26-pin pc micro floppy drive.
And those wires are not in short circuit even if it looks like that
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Last edited by SilverZguru; 17 December 2012 at 17:32.
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