Modifying PC floppy drives for Amiga use

[prowler]

Originally Posted by AMIGA500FAN

hello guys! I have a samsung sfd-321b/le rev wt-04, is there any way to make it work work the amiga 500. Thank you very match!

Hello AMIGA500FAN, and welcome to EAB.

You can make that floppy drive work with your Amiga 500 using Stedy's PC floppy adaptor for Amiga.

However, you might need to do some work with a dremel to get it to fit in the case properly.

[jarob]

Floppys Panasonic JU-257A6xx works very stable at 150rpm.
In yers 2000-2002, more than 200 units I have modified panasonic floppy to HDD. They work with any Amiga from OS 2.04.

[Jope]

Originally Posted by jarob

Floppys Panasonic JU-257A6xx works very stable at 150rpm.
In yers 2000-2002, more than 200 units I have modified panasonic floppy to HDD. They work with any Amiga from OS 2.04.

Would you be willing to share your secret with us?

[cosmicfrog]

not sure if this link has been posted in this thread but I came across it the other day

http://www.rabayjr.com/amiga_floppy_drives.htm

[cpiac64]

i have a 1200 for repair, i remove warranty and open, the drive is broken, is panasonic ju-257a605p and under the mainboard i find a wire from pin 2 to 34 (like escom-amiga tecnology), remove the floppy and insert one from another 1200 (chinon) and remove a wire from 2 to 34 and add a wire for use the chinon, now thw 1200 is perfect, but i need more info on original panasonic ju-257a605p, in the escom-amiga tecnology a1200 the drive is 880k or 1760?

[jarob]

Originally Posted by Jope

Would you be willing to share your secret with us?

Yes, of course. Just find its documentation.

[Supamax]

Originally Posted by Jope

Floppys Panasonic JU-257A6xx works very stable at 150rpm.
In yers 2000-2002, more than 200 units I have modified panasonic floppy to HDD. They work with any Amiga from OS 2.04.

Yes, of course. Just find its documentation.

Hi jarob, where can we find the documentation?

[orange]

Originally Posted by cpiac64

in the escom-amiga tecnology a1200 the drive is 880k or 1760?

i think its 1440

[jarob]

Originally Posted by Supamax

Hi jarob, where can we find the documentation?

I have to look for it in the recesses of hard drive on my A500T.

As I have written worked on it in 2002. Later, the demand is over and the cooperation with company ended.

[jarob]

Originally Posted by orange

i think its 1440

1440 it's PC format - crossdos
1760 it's AmigaOs format

[cpiac64]

i know the various format, i need more info on floppy panasonic mounted on amiga1200

interest modify on aminet
A1200FDfix

[orange]

Originally Posted by jarob

1440 it's PC format - crossdos
1760 it's AmigaOs format

yes, I know. but by '1,44Mb drives' I meant 'ordinary cheap PC floppys that cannot easily slow down to 150RPM but can be modified to work as 880/DD Amiga drives'. it should have been obvious.

[cpiac64]

ok for rpm, the a1200 at-escom mount a panasonic ju-257a605p but in my a1200 is broken and i want repair it, but i need to know if work at 150rpm in original or not

[prowler]

Originally Posted by cpiac64

ok for rpm, the a1200 at-escom mount a panasonic ju-257a605p but in my a1200 is broken and i want repair it, but i need to know if work at 150rpm in original or not

The Panasonic JU-257A 605P is a PC compatible 1.44MB floppy drive unit typical of those used by Escom in their AT1200 machines. The Escom AT1200 motherboard is modified to allow PC compatible floppy drives to be used as 880K Amiga drives.

These units were never designed to be used at 150 RPM, so they cannot be used as 1760K Amiga high density drives.

[cpiac64]

thanks prowler

[jarob]

Originally Posted by prowler

The Panasonic JU-257A 605P is a PC compatible 1.44MB floppy drive unit typical of those used by Escom in their AT1200 machines. The Escom AT1200 motherboard is modified to allow PC compatible floppy drives to be used as 880K Amiga drives.

These units were never designed to be used at 150 RPM, so they cannot be used as 1760K Amiga high density drives.

Yes, but after my modifications to the floppy (Panasonic) could be used as HD 1760K.

Today I will try to find documentation.

These floppy drive were almost not corruptible. Most are dirt or heads, or swiches DP, HD/DD.

[Boboo_SK]

Originally Posted by prowler

The Panasonic JU-257A 605P is a PC compatible 1.44MB floppy drive unit typical of those used by Escom in their AT1200 machines. The Escom AT1200 motherboard is modified to allow PC compatible floppy drives to be used as 880K Amiga drives.

These units were never designed to be used at 150 RPM, so they cannot be used as 1760K Amiga high density drives.

Here is a link to one of my old projects, Panasonic HD drives rebuilt to 1.76 MB, (GAL16V8 contains 34 logical gates) Fully compatible Chinon BF-357A.
http://www.amigaportal.cz/forum/show...ighlight=arise
[ Show youtube player ]

[Supamax]

Originally Posted by jarob

Today I will try to find documentation.

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?

[prowler]

Originally Posted by Boboo_SK

Here is a link to one of my old projects, Panasonic HD drives rebuilt to 1.76 MB, (GAL16V8 contains 34 logical gates) Fully compatible Chinon BF-357A.
http://www.amigaportal.cz/forum/show...ighlight=arise
[ Show youtube player ]

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.

[cpiac64]

is possible order 10 gal with software?