Modifying PC floppy drives for Amiga use - Page 10

Boboo_SK · 05 January 2012, 07:43

Quote:

Originally Posted by Supamax

No need to find it today (I mean, there's no hurry), but it will be VERY interesting

.
Was it a complex modification?
And (a 1-million dollar question, I know) could it be applied to other models/manufacturers?

SONY MPF920-E - Read 100% / Write 90% (sometimes write error)
Panasonic JU257A605 - Read 100% / Write 100% (Best of)
Panasonic JU257A606 - Read 100% / Write 100% (Best of)
Alps DF354H090F - Read 100% / Write BAD
TEAC FD-235HF - not tested, may be working...

Boboo_SK · 05 January 2012, 07:50

Quote:

Originally Posted by cpiac64

is possible order 10 gal with software?

Yes

jarob · 05 January 2012, 09:50

Quote:

Originally Posted by prowler

Thanks for posting, Boboo_SK!

I should imagine that jarob's modification will turn out to have been something quite similar. The conversion to Amiga 1760K is not trivial.

Yes, the modifications are similar, as modeled on the same datasheet and specifications.
I did not find full documentation, but I have a schematic and picture of board.
Missing images only connections. I will open one of my floppy and do pictures.

Here are pictures of floppy during and after modification: http://www.fotosik.pl/u/jarob/album/1065532

Only the Panasonic motor runs stable at 150 rpm. I also tried Samsung and Mitsumi floppy, but the motor was struggling.

Panasonic JU257A515 - Read 100% / Write 100% (Best of)
Pabasonic JU257A516 - Read 100% / Write 100% (Best of)
Panasonic JU257A517 - Read 100% / Write 100% (Best of)
Panasonic JU257A605 - Read 100% / Write 100% (Best of)
Pabasonic JU257A606 - Read 100% / Write 100% (Best of)

Boboo_SK · 05 January 2012, 10:35

@Jarob

Progressing good way, but you got the error. Incorrect generates RDY 880KB. Your logic, it can damage data when writing to disk. RDY must start when the Index - Falling Edge

jarob · 05 January 2012, 13:06

I'm not saying there are no errors. I just have not seen them. Write DD 100% good. I've never had this problem.

Boboo_SK · 05 January 2012, 13:40

Quote:

Originally Posted by jarob

I'm not saying there are no errors. I just have not seen them. Write DD 100% good. I've never had this problem.

If you drive generates RDY, so everything is all right. Your solution is simple, if it works, so I congratulate you.

Bamiga2002 · 05 January 2012, 14:02

Panasonic/Pabasonic must be the better drives to use with Amiga. I still have Jope's modified drive in use and working great!

jarob · 05 January 2012, 23:45

In post # 183 I added a link to photos.

prowler · 05 January 2012, 23:50

Thankls for your contribution, jarob!

cpiac64 · 06 January 2012, 00:02

next week i test jarob solution on 1 drive panasonic, but 2 photo are 2 similar schematics, and diode aap156 is equivalent to ?

jarob · 06 January 2012, 22:21

The AAP156 diode is a germans diode. It has a smaller voltage drop junction than the silicon diode and it is all.

prowler · 06 January 2012, 22:31

Germanium diode forward voltage drop is approximately 0.3V.

cpiac64 · 06 January 2012, 22:35

ok, the best circuit is that with xtal or the other?

jarob · 06 January 2012, 23:49

Plate with 2 image is universal. I did try the Samsung and Mitsumi floppy. Please install these components, which are in the diagram, for a 1 picture. This can be seen also on photos in album with modifications made.

acadiel · 18 March 2012, 06:57

Anyone know if you can modify two drives and put them in an A2000?

What if you want to use the external connector? I've seen a few posts about diodes....

cpiac64 · 18 March 2012, 14:42

wesnday i go test 2 drive hd in to a2000, then post report

acadiel · 18 March 2012, 21:54

I got bored...

YE Data YD-702D-6037DA 3.5" drive - replaced DF1 Chinon in A2000 with this. It had jumpers (!?) for DS0/DS1, so I made it DS1, and changed from DC to RDY (there was also a jumper for this.) I then jumpered pin #2 to DC on the bottom of the drive.

Mitsumi D359T5 3.5" drive - replace DF0 Chinon in A2000 with this. I removed the bridge from DS1 and made it DS0. I also removed the jumper from DC and change it to RDY. I then jumpered pin #2 to DC on the bottom of the drive.

Bottom line: I ran the Odyssey mega demo with the two internal drives (and an external Amiga DF2) and it all seemed to work fine. I'm going to try to format some drives now.

I have some more spares laying around, mostly Teac FD-235HF's, so I will try those and see how they work as well.

acadiel · 18 March 2012, 23:56

Quote:

Originally Posted by acadiel

I got bored...

YE Data YD-702D-6037DA 3.5" drive - replaced DF1 Chinon in A2000 with this. It had jumpers (!?) for DS0/DS1, so I made it DS1, and changed from DC to RDY (there was also a jumper for this.) I then jumpered pin #2 to DC on the bottom of the drive.

Mitsumi D359T5 3.5" drive - replace DF0 Chinon in A2000 with this. I removed the bridge from DS1 and made it DS0. I also removed the jumper from DC and change it to RDY. I then jumpered pin #2 to DC on the bottom of the drive.

Bottom line: I ran the Odyssey mega demo with the two internal drives (and an external Amiga DF2) and it all seemed to work fine. I'm going to try to format some drives now.

I have some more spares laying around, mostly Teac FD-235HF's, so I will try those and see how they work as well.

Just an update on the FD-235HF's...

Someone in this thread attempted to modify one:

http://www.amibay.com/showthread.php?t=9934&page=2
http://www.kipper2k.com/amiga/teac.jpg

Going from DS0 to DS1 was easy.

I noticed that they did hook pin #2 up to DC (directly on the IC). But, they needed to unhook pin #34 (which was also hooked to DC), so they cut that trace going to pin #34 (the jumper usually does this.)

However, the last piece of the puzzle - jumping RDY - I think they tried doing this by hooking up pin #34 to pin #30. This won't let the Amiga use an external drive. If you notice the picture, it looks like the other set of jumpers (R16) next to DS0/DS1 was for RDY - I simply moved the 000 ohm resistor from the right to the left (parallel) in R16. Didn't do the pin #34 to pin #30 thing. Hooked up the drive, booted it, and it apparently did the trick. I booted up and it saw DF0 inside the A2000 and DF2 on the external bus. (Saw both floppies too, good old NewTek Demo Reel 1).

Not sure if this is 100% electronically correct, but it worked.

acadiel · 20 March 2012, 03:01

I have a recycler looking for drives for me with the RDY/DC pins either on the back of the drive or that have the jumpers labeled at the bottom. This recycler has quite a stock of stuff, so I hope they find some stuff

prowler · 20 March 2012, 22:02

Thanks for your contribution here, acadiel!

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05 January 2012, 10:35	#184
Boboo_SK Develop HW Join Date: Jul 2011 Location: Nitra / Slovakia Posts: 101	@Jarob Progressing good way, but you got the error. Incorrect generates RDY 880KB. Your logic, it can damage data when writing to disk. RDY must start when the Index - Falling Edge

05 January 2012, 13:06	#185
jarob Registered User Join Date: Dec 2011 Location: Poland Posts: 12	I'm not saying there are no errors. I just have not seen them. Write DD 100% good. I've never had this problem.

05 January 2012, 14:02	#187
Bamiga2002 BlizzardPPC'less Join Date: May 2004 Location: Finland Age: 46 Posts: 3,210	Panasonic/Pabasonic must be the better drives to use with Amiga. I still have Jope's modified drive in use and working great!

05 January 2012, 23:45	#188
jarob Registered User Join Date: Dec 2011 Location: Poland Posts: 12	In post # 183 I added a link to photos.

05 January 2012, 23:50	#189
prowler Global Moderator Join Date: Aug 2008 Location: Sidcup, England Posts: 10,300	Thankls for your contribution, jarob!

06 January 2012, 00:02	#190
cpiac64 Registered User Join Date: Apr 2010 Location: Italy Posts: 1,136	next week i test jarob solution on 1 drive panasonic, but 2 photo are 2 similar schematics, and diode aap156 is equivalent to ?

06 January 2012, 22:21	#191
jarob Registered User Join Date: Dec 2011 Location: Poland Posts: 12	The AAP156 diode is a germans diode. It has a smaller voltage drop junction than the silicon diode and it is all.

06 January 2012, 22:31	#192
prowler Global Moderator Join Date: Aug 2008 Location: Sidcup, England Posts: 10,300	Germanium diode forward voltage drop is approximately 0.3V.

06 January 2012, 22:35	#193
cpiac64 Registered User Join Date: Apr 2010 Location: Italy Posts: 1,136	ok, the best circuit is that with xtal or the other?

06 January 2012, 23:49	#194
jarob Registered User Join Date: Dec 2011 Location: Poland Posts: 12	Plate with 2 image is universal. I did try the Samsung and Mitsumi floppy. Please install these components, which are in the diagram, for a 1 picture. This can be seen also on photos in album with modifications made.

18 March 2012, 06:57	#195
acadiel Registered User Join Date: Mar 2012 Location: USA Posts: 16	Anyone know if you can modify two drives and put them in an A2000? What if you want to use the external connector? I've seen a few posts about diodes....

18 March 2012, 14:42	#196
cpiac64 Registered User Join Date: Apr 2010 Location: Italy Posts: 1,136	wesnday i go test 2 drive hd in to a2000, then post report

18 March 2012, 21:54	#197
acadiel Registered User Join Date: Mar 2012 Location: USA Posts: 16	I got bored... YE Data YD-702D-6037DA 3.5" drive - replaced DF1 Chinon in A2000 with this. It had jumpers (!?) for DS0/DS1, so I made it DS1, and changed from DC to RDY (there was also a jumper for this.) I then jumpered pin #2 to DC on the bottom of the drive. Mitsumi D359T5 3.5" drive - replace DF0 Chinon in A2000 with this. I removed the bridge from DS1 and made it DS0. I also removed the jumper from DC and change it to RDY. I then jumpered pin #2 to DC on the bottom of the drive. Bottom line: I ran the Odyssey mega demo with the two internal drives (and an external Amiga DF2) and it all seemed to work fine. I'm going to try to format some drives now. I have some more spares laying around, mostly Teac FD-235HF's, so I will try those and see how they work as well.

20 March 2012, 03:01	#199
acadiel Registered User Join Date: Mar 2012 Location: USA Posts: 16	I have a recycler looking for drives for me with the RDY/DC pins either on the back of the drive or that have the jumpers labeled at the bottom. This recycler has quite a stock of stuff, so I hope they find some stuff

20 March 2012, 22:02	#200
prowler Global Moderator Join Date: Aug 2008 Location: Sidcup, England Posts: 10,300	Thanks for your contribution here, acadiel!

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