8" drive support

Have an idea how to make KryoFlux even better? Let us know...
Tor
Posts: 28
Joined: Mon May 16, 2011 3:08 pm

Re: 8" drive support

Post by Tor » Tue May 17, 2011 12:02 pm

Just found this thread after posting in the other ('8" floppy drives work!'), but maybe it would have been more appropriate here. viewtopic.php?f=3&t=159&start=20#p1242
I'm almost ready to try my setup (I have cables, plugs, connectors, PC with floppy interface, the DBit adapter, two Shugart SA 800 and one Shugart power supply). But I'll try the Kryoflux method described in that other thread first I think (as soon as it arrives here).

Just one note about the power supplies for those old Shugarts.. the guy who owns the drives I'm borrowing told me that he has tried other power supplies which "should" have worked according to the specs, but it only works with the original PSU. The problem seems to be that when the heads click in there's a huge power surge, and most of today's cheap consumer supplies are unable to handle that surge. The original Shugart PSU has a huge capacitor on board, and some slightly smaller buckets which I can't identify - could be more capacitors.
Hostinfo: Debian SID x86_64 and i686

User avatar
Malvineous
Posts: 156
Joined: Sun Oct 31, 2010 10:57 pm
Location: Brisbane, Australia
Contact:

Re: 8" drive support

Post by Malvineous » Mon May 23, 2011 11:22 pm

Interesting - I did wonder why the capacitors on the original PSU were so large, but that explains it. However if you have a dedicated 24V power supply (separate to the 5V line) I wouldn't have thought it would be a problem, as any surge on the 24V line won't affect the circuitry running on 5V. Of course you might need a hugely overrated 24V supply as smaller ones might see the sudden current draw as a short circuit and switch themselves off.

Namida88
Posts: 7
Joined: Tue Dec 14, 2010 2:58 pm
Location: Tokyo, Japan

8" drive support

Post by Namida88 » Wed Jun 01, 2011 7:57 pm

This tells I won't be able to test my drives too soon.
The two Shugart ones I bought from ebay came without power supply.
I should have thought about it before I bid.

Now I hope we manage do make it with NEC drives, which are easier to find (and cheaper too).

User avatar
Malvineous
Posts: 156
Joined: Sun Oct 31, 2010 10:57 pm
Location: Brisbane, Australia
Contact:

Re: 8" drive support

Post by Malvineous » Sat Jun 11, 2011 5:06 am

The NEC drives and Shugart drives use similar power supplies. NEC requires +24VDC and +5VDC, while the Shugarts requires these as well as mains power (240VAC for my drives) and some negative voltage, e.g. -12VDC.

You should be able to get +5VDC and -12VDC from an old AT/ATX power supply, and getting mains power from a wall socket is easy, so only +24VDC is tricky, and it is required for both NEC and Shugart drives.

Namida88
Posts: 7
Joined: Tue Dec 14, 2010 2:58 pm
Location: Tokyo, Japan

Re: 8" drive support

Post by Namida88 » Wed Jul 20, 2011 8:15 am

With some help, I was able to connect a NEC FD1165-A to the KF.
Here is what we did :

- Remove the drive from its enclosure and look for a jumper called RD.
- Change jumper settings from 2 to 1 (don't forget to put it back to 2 if using the drive again with a Japanese PC, this is the VFO switch).
- Now connect a straight flat 50 pins cable to the drive and make sure to that the red line is connected on PIN 50 !!
- Connect the other end of the cable to the FDADAP 8" adapter (http://www.dbit.com/fdadap.html)
- Connect the FDAPAP and the KF together (but do not connect yet the KF to the PC)
- I recommend you let the 8" drive in horizontal position (less noise and better chances not to damage the central part of the disks)
- Power on in order the 8" drive (using the 24v from its enclosure) and the FDAPAP, then connect KF to the PC.
- Insert a blank disk, and test with DTC -C2 command : you should get a maxtrack=41 is everything's fine

I dumped a Japanese DOS disk with the following command :

DTC.exe -fflux -p -i0 -i2 -fimage.img -v360 -k1 -z3 -e77 -t30 -i4 1>>log.txt 2>>error.txt

Some remarks :

- test done with v1.00 beta 10, uiv.1
- using both slow and fast firmware is working
- although it says maxtrack=41, the drives can read up to track 83
- unfortunately even using the -e77 switch, DTC will try to read tracks above and makes noise you cannot avoid
- most games are mixing sector size (256/512/1024)
- I got some "MFM: <unformatted>" tracks also I am sure they're not empty (for example track 00.0 for the system disk, which is properly booting on the real machine)
- I got some "MFM: <mismatch>" but could never find the proper sector size (maybe some tracks are using FM as copy protection ?)
IMG_0197.JPG
IMG_0197.JPG (42.62 KiB) Viewed 3316 times
IMG_0201.JPG
IMG_0201.JPG (38.7 KiB) Viewed 3316 times
IMG_0202.JPG
IMG_0202.JPG (39.91 KiB) Viewed 3316 times

clemfm
Posts: 38
Joined: Tue Jul 19, 2011 12:40 am

Re: 8" drive support

Post by clemfm » Sun Sep 25, 2011 12:49 am

There was some talk of an -ec option which would only read 77 tracks as opposed to -e which apparently creates an 80 track image from a 77 track disk/drive by padding out the remaining 3 tracks with 0's:

viewtopic.php?f=4&t=57&p=367&hilit=ec77#p367

Hope this option appears soon. Please :)

User avatar
IFW
Posts: 3077
Joined: Mon Nov 08, 2010 2:42 pm

Re: 8" drive support

Post by IFW » Sun Sep 25, 2011 3:53 pm

It's not been forgotten, just we are very, very busy :)

clemfm
Posts: 38
Joined: Tue Jul 19, 2011 12:40 am

Re: 8" drive support

Post by clemfm » Mon Sep 26, 2011 11:14 am

I'm awaiting the -ec option before I buy a Kryoflux to archive a number of 77 track 5.25 inch disks.

Are we looking at weeks or perhaps months for this update?

User avatar
IFW
Posts: 3077
Joined: Mon Nov 08, 2010 2:42 pm

Re: 8" drive support

Post by IFW » Mon Sep 26, 2011 11:56 am

This addition could potentially cause regressions in the format exporters that would need extensive testing.
I'll take a look, and see how it goes, but no ETA yet.
I'd hope it's weeks rather than months, but there are many other ongoing developments...

clemfm
Posts: 38
Joined: Tue Jul 19, 2011 12:40 am

Re: 8" drive support

Post by clemfm » Mon Sep 26, 2011 11:55 pm

Sounds great!

I'm sure there must be a lot of people lurking who want to work with 77 track 8", 51/4" (such as the Mitsubishi 4854) and even the far less common 77 track Japanese "mode 3" "31/2" disks that will thank you for this.

After all it's these disks which are the oldest and I would have thought need archiving the soonest.

Post Reply