Is this suitable for flippy modding ?

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ZrX
Posts: 477
Joined: Tue Dec 06, 2011 9:09 pm

Re: Is this suitable for flippy modding ?

Post by ZrX » Wed Sep 12, 2018 8:22 pm

There's description to flippymod Teac drive on the forum, but for that you do need the alignment disk and oscilloscope. Then there are Newtronics drives and those also need alignment disk and oscilloscope.

Vipersan
Posts: 58
Joined: Sun Jul 01, 2018 5:40 pm

Re: Is this suitable for flippy modding ?

Post by Vipersan » Wed Sep 19, 2018 1:09 pm

So ..my drive arrived ..but I suspect my version is a little older than the one in the youtube SPS vids.
I have to unsolder 3 sets of wires ..to remove the pcb ..
Sadly not all have plugs ..
on the plus side there are indications on the pcb indicating colour codes for the wires.
I've not yet broke out the dremel ..on account I wanted to try moving that bronze bush (ferrule) the required 2.5mm.
I dont want to use more force than is needed ..so came up with a plan ..involving an M4 nut and bolt ..
..and a helical steel spring..
Not tried it yet but can't see why it wouldn't work.
If it does ..the movement would be gradual ..so an application of silicon spray first..
hope the picture explains what I intend to do.
rgds
VS
Attachments
To Move bush .jpg

Vipersan
Posts: 58
Joined: Sun Jul 01, 2018 5:40 pm

Re: Is this suitable for flippy modding ?

Post by Vipersan » Wed Sep 19, 2018 2:18 pm

Ok ..Job done..
though I had to substitute a small section of steel tubing for the helical spring ..
more force was needed ..and sadly the spring started spreading (diameter increased) ..as the nut was tightened..
swapped for the tube (similar dimensions) ..and the bronze bush started moving ..
to it's new resting place.

If you need to source a piece of tubing to do the above ..
I took mine from an old FM telescopic antenna..
rgds
VS
Attachments
DSCF0030.JPG
DSCF0029.JPG
DSCF0028.JPG

ZrX
Posts: 477
Joined: Tue Dec 06, 2011 9:09 pm

Re: Is this suitable for flippy modding ?

Post by ZrX » Wed Sep 19, 2018 3:46 pm

As long as you avoid scratching the inside of the brass part you'll be good. It needs to be absolutely smooth.

Vipersan
Posts: 58
Joined: Sun Jul 01, 2018 5:40 pm

Re: Is this suitable for flippy modding ?

Post by Vipersan » Wed Sep 19, 2018 3:57 pm

The story so far ..
Have I removed enough of the bushing sleeve..
I guess only time will tell ...and for me with MS and bad eyes this was the trickiest part using a knife..
my motor skills are somewhat impared.
rgds
VS
Attachments
DSCF0032.JPG
DSCF0031.JPG

Vipersan
Posts: 58
Joined: Sun Jul 01, 2018 5:40 pm

Re: Is this suitable for flippy modding ?

Post by Vipersan » Wed Sep 19, 2018 4:48 pm

Time to start on the main drive chassis I guess ..
The head assembly mods are done ..but still have cleaning to do.
..and yes the head assembly slides smoothly on the rail.
rgds
Attachments
DSCF0033.JPG
Last edited by Vipersan on Wed Sep 19, 2018 8:12 pm, edited 1 time in total.

Vipersan
Posts: 58
Joined: Sun Jul 01, 2018 5:40 pm

Re: Is this suitable for flippy modding ?

Post by Vipersan » Wed Sep 19, 2018 5:03 pm

Not as right angled as I'd like ..but perhaps good enough ?
Attachments
DSCF0035.JPG

Vipersan
Posts: 58
Joined: Sun Jul 01, 2018 5:40 pm

Re: Is this suitable for flippy modding ?

Post by Vipersan » Wed Sep 19, 2018 8:09 pm

Well ..the drive is reassembled but as yet ..drive board electronics mod has not been done..
I just wanted to test the drive still functioned.
I suspect without the transistor mod ..it would not behave as it did previously ..
but I at least managed to use calibrate ..and max 83 tracks reported then DTC just hung ..
I'm assuming because the heads entered negative territory..
Fingers crossed the rest of the mod goes according to plan....but at least the heads travel smoothly.
rgds
VS

ZrX
Posts: 477
Joined: Tue Dec 06, 2011 9:09 pm

Re: Is this suitable for flippy modding ?

Post by ZrX » Thu Sep 20, 2018 3:32 pm

About the track 0 extension...
head.jpg
Make sure the extending part on the side pointed by the green arrow is not made of just plain black plastic such as tape as that can often pass infrared light.

Important one:

On the side pointed by the red arrow, make sure what you glue/stick to the original plastic part doesn't come over the original edge. That side is what blocks the track 0 sensor when the head moves to track 0 and it will most likely trigger the sensor too early when the head is still on track 1.

Without the track 0 bypass electronic modification the drive should still function like as if it was not flippy modded so you can test it by issuing it a command such as dtc -c1 -g0 -i6 -l8 to check that the track 0 offset is still ok from a C64 floppy.

Vipersan
Posts: 58
Joined: Sun Jul 01, 2018 5:40 pm

Re: Is this suitable for flippy modding ?

Post by Vipersan » Thu Sep 20, 2018 8:18 pm

Well ..I guess I'm ready to test .
The bypass transistor now fitted ..
Drive reinstalled in my dual floppy kryo unit.
I have tested it insofaras ..it calibrates.
I have tried reading a DOS floppy ..(GUI)
and the img file created looks good.
I popped in the only genuine flippy I own ..
Defender of the crown C64
Side 1 dumps without problems.(GUI)
As to the flip side ..
no idea how to do this ..nor even if the gui can dump flippies?
I tried to dump it by opening a command prompt and using the line (copied from elsewhere in the forum)...
dtc.exe -p -fdumpdir\track_ -i0 -g2 -y -i6 -i2 -b-8 -l8 -t10

No index found ...which I guess shouldn't surprise me as the kryo unit is trying to access the 1.44mb floppy which is drive (0)
the 5.25" flippy is drive (1)...and never having used the DOS commands ..I have no idea how to redirect to select drive 1 ?
It would be much easier for me personally if I can dump flippys from the gui ..
but no idea how ?
there is a tick box ..which I did tick under settings ..but this made no difference ..
I still only dumped the A side of the floppy.
Time to ask for help and get educated..
but at least the modded drive appears to work as it did before modding..
which I guess is a win ..sort of..
rgds
VS

..oh and yes I found out the hard way that anything beyond the edge of the actuator triggers early ..
I had to remove the head assembly again ..and trim it clean.
I am using black card rather than plastic ..

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