06 December 2012, 13:38 | #1 |
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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! |
06 December 2012, 21:40 | #2 | |
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Quote:
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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06 December 2012, 22:22 | #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 |
07 December 2012, 15:28 | #4 | |
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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 21:33. Reason: Fixed link. |
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07 December 2012, 21:20 | #5 | ||
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Thanks for completing the picture, SilverZguru.
Quote:
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:
Last edited by prowler; 07 December 2012 at 21:34. Reason: Fixed link in quote. |
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07 December 2012, 23:52 | #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 |
08 December 2012, 10:16 | #7 |
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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. |
08 December 2012, 20:55 | #8 | ||
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Quote:
Quote:
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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09 December 2012, 20:22 | #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 http://www.martinruss.com/sy99adapter.html |
11 December 2012, 18:20 | #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. |
11 December 2012, 19:35 | #11 | |
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Quote:
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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12 December 2012, 17:44 | #12 |
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That would be awesome Prowler!
I'm so stuck now that I really need some advices... But thanks again! |
13 December 2012, 13:06 | #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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15 December 2012, 09:01 | #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! |
15 December 2012, 20:23 | #15 |
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i add a photo soon
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15 December 2012, 21:05 | #16 | |
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Quote:
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 21:17. |
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16 December 2012, 16:39 | #17 |
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16 December 2012, 23:13 | #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; 16 December 2012 at 23:33. Reason: Typo. |
17 December 2012, 00:38 | #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... |
17 December 2012, 16:12 | #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 Last edited by SilverZguru; 17 December 2012 at 16:32. |
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