Mitsumi D359M3 PC 1.44MB floppy drive mod

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Dazxy2001

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Following on from a Sony drive I had converted for Amiga use I picked up another drive in a box of PC parts very cheaply, namely the Mitsumi D359M3. I obtained instructions from here
http://www.pitsch.de/stuff/amiga/a1korg_01.pdf

All well and good but I have no inclination of what it says being as its in German and putting it into google translate just mangled the text :/
The original photograph wasnt exactly clear as to what was going on but managed to muddle through with a little trial and error thrown in :)
So, firstly I put a solder link at the connection situated at DEN 2....
Next a link was placed between pin 34 and the right hand pad at DEN 3, The track which leads from pin 34 to the IC should then be severed.
(This was where I got confused with the instructions as the number 2 and 34 are marked on the board, but are for the bottom row and not the top as indicated by the photograph supplied).
The next part is where the mangled instruction threw me a little and could quite figure out what was going on......
Firstly from pin 12 cut the track leading from it, then following the track past a set of pads it takes a turn to the left, in that area scrape the coating from it to reveal the copper and add a liberal dab of flux paste, next solder a wire from pin 10 to the strip of bare copper, and thats it.
Here is a pic of the completed drive....
DSCF0391.jpg


I tested the drive by booting from it, formating a disk in it then do a diskcopy of Workbench then boot from it.
Disk changed worked properly, one issue I did appear to have was once the Workbench disk was copied from DF1 a copy_of_workbench didnt appear on the desktop, but everything else went ok and I booted successfully from the modified drive. I also tried a couple of games without any issues.
 
When you copy a disk the newer one would be always "copy_of_nnnnnnn". Normal behaviour if you didn't use a disk copier other than the built-in in Workbench.
 
Did a project on mitsumi drive years ago. Its one of the best drive I had. Its read/write was better than any standard amiga drive. This was probably down to better read/write heads or 100% spot on head alignment. This driver also has flash card slots. All this fitted in a standard floppy drive bay & could be fitted in a standard A1200 desktop.

But now iv moved on to motorize eject system where the A1200 must be powered up in order to eject the floppy drive.

---------- Post added at 02:48 ---------- Previous post was at 02:34 ----------

Looking at that drive modification *if* it has the same chip which im guessing it is,then my modification is different.
 
Brilliant :D I always knew/suspected PC bits 'HAD' to be useful for a 'proper' computer :lol:

Ideal for the old tower conversion :thumbsup:

PS: I did noticed (1990s era) that the Mitsumi drives were pretty good and reliable compare to other floppy makes.
 
Be even better if old Amiga drive buttons could be modified easily so they can be used as DF0: in a desktop case
 
I have a bunch of these Mitsumi FDDs and your guide was really useful... Thank you.


Cheers,
Oge
 
2 mitsumi's on 1 cabe

2 mitsumi's on 1 cabe

Hi, i've made the mods to 2 drives, and i want to use them in an a2000 on 1 cable. Do i have to change anything else to make them work. I've tested each one of the drives single on my cable an it works. When i put both of them on my cable, they don't work. So, what do i need to do ?
thanks.:help:
 
Deepl is better then google translate in 2012, might aswell try this modd as I have a floppy drive floating around.
was bored so I grabbed a couple of PC floppies and tried to use them as
them as DD drives to my Amiga incl. disc change and ready signal.
signal.
Since that was easier than I thought I took a few photos.
Here is the conversion for the Mitsumi-D359M3
The jumper field labelled "DEN2" has to be closed and you have the disc change signal.
you have the discchange signal
The ready signal is located on the right at "DEN3" and must be connected to pin 34.
The track that leads from pin 34 to the IC in the centre must be cut open
(razor knife or something)
As the drive is permanently configured to 1, the track leading away from pin 12 must be must be disconnected and connected to pin 10
 
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