Modified Drive (old method,) move to positive on failure

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ZrX
Posts: 245
Joined: Tue Dec 06, 2011 9:09 pm

Re: Modified Drive (old method,) move to positive on failure

Post by ZrX » Mon Mar 13, 2017 7:34 am

It should do a single seek in and out and report 0 or so, but not move below track 0 again.

It's the only drive on the cable?

And everything still works normally if the head doesn't stop below 0?

Pheonix
Posts: 30
Joined: Sat Nov 13, 2010 8:16 pm

Re: Modified Drive (old method,) move to positive on failure

Post by Pheonix » Mon Mar 13, 2017 8:54 am

Yes, it works normally as long as it doesn't stop below 0. What it seems to be doing is a seek 0, which automatically moves the head out until the track 0 sensor trips. Only, since the head is already past 0, it will never hit the sensor, so it just bounces on the physical block, I would assume 79 times (or less, if it had room to move in the first place.) What I have to do, is reach in and shove the head towards the front of the drive during this. Then I have it do another seek to 0 (which then resets it correctly.) I can only do this when the head is trying to move, though. The entire process makes me a bit nervous, really. I don't know how easy it is to mess up a drives alignment. Though, I imagine that seeking to the track 0 sensor would set the alignment each time, and aligning the drive would involve adjusting the location of the sensor. I don't "know" this, though. So, it makes me nervous.

rcade
Posts: 65
Joined: Mon Nov 21, 2011 5:21 pm

Re: Modified Drive (old method,) move to positive on failure

Post by rcade » Sat Mar 18, 2017 8:57 pm

I thought part of the mod was to extend the "arm" that trips the track 0 sensor so that when below 0, it always is still reporting track 0 via the sensor. At least mine is that way...
-
Pete Rittwage
C64 Preservation Project
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ZrX
Posts: 245
Joined: Tue Dec 06, 2011 9:09 pm

Re: Modified Drive (old method,) move to positive on failure

Post by ZrX » Sat Mar 18, 2017 10:12 pm

Ah indeed. Is there anything glued to the black plastic part that slides between the sensor?

Pheonix
Posts: 30
Joined: Sat Nov 13, 2010 8:16 pm

Re: Modified Drive (old method,) move to positive on failure

Post by Pheonix » Sun Mar 19, 2017 12:05 am

Mine was modified with the original method. If I remember, and understand, it correctly.. It would actually disable the sensor briefly after seeking to 0 allow the stepper motor to step past track 0 however many tracks below zero (usually -8,) you set it to. Then it would read, step, read, step, etc.. until it had reached zero again. At which point, it would turn the sensor back on and start reading normally from 0 and above.

ZrX
Posts: 245
Joined: Tue Dec 06, 2011 9:09 pm

Re: Modified Drive (old method,) move to positive on failure

Post by ZrX » Sun Mar 19, 2017 11:33 am

If the bit extending the sensor blocking part is missing you'll have problems.

Pheonix
Posts: 30
Joined: Sat Nov 13, 2010 8:16 pm

Re: Modified Drive (old method,) move to positive on failure

Post by Pheonix » Fri Mar 24, 2017 10:09 am

ZrX wrote:
Sun Mar 19, 2017 11:33 am
If the bit extending the sensor blocking part is missing you'll have problems.
Not sure exactly which bit you are talking about. I do know that there is one pin that turns the sensor on/off. Removed that pin from the connector on my 3.5" drive so that it wouldn't ground out (preventing it from working.) it seems to work just fine, other than issues mentioned here. The test uploads to SPS were reported as good. My dumps, when converted, work fine in emulation (those that have formats that support copy protection.) Writing IPF, G64 (with mastering data,) and ADF files all write just fine. Up until my last move, writing RAW files worked fine. Lately, though, it hasn't worked :( Could just be a large batch of bad disks, but when I convert to ADF or G64 it "appears" to fix the issue.

ZrX
Posts: 245
Joined: Tue Dec 06, 2011 9:09 pm

Re: Modified Drive (old method,) move to positive on failure

Post by ZrX » Fri Mar 24, 2017 10:29 am

The black piece of plastic that moves between the track 0 sensor. It should have an extension glued to it that keeps the sensor blocked while at negative tracks.

Pheonix
Posts: 30
Joined: Sat Nov 13, 2010 8:16 pm

Re: Modified Drive (old method,) move to positive on failure

Post by Pheonix » Fri Mar 24, 2017 6:16 pm

From what I understand, that isn't how the original method worked. The sensor was disabled electronically, not physically. The new method, if I understand it correctly, physically moved the sensor to position -8, making the the triggering line obsolete. Though, it meant having to add -a8 to read a flippy disk, and -a8 -b8 to read a non flippy disk.

ZrX
Posts: 245
Joined: Tue Dec 06, 2011 9:09 pm

Re: Modified Drive (old method,) move to positive on failure

Post by ZrX » Fri Mar 24, 2017 6:33 pm

No, there needs to be a piece glued to the sensor arm ALONG WITH the electronic patch.

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