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sailor
Registered: Jan 2002
Posts: 90 |
Release id #194046 : 1541 Speed Test
Regarding the alignment, would you elaborate your thoughts on the following: (from the docs)
Quote:F3 align the head to track 42 in a better way than other programs do.
F5 moves the head to track 1
How to correctly align a drive:
1) gently unscrew the screws of the track 1 "stop"
2) press F3
3) press F5
4) gently move the track 1 block so there is 0.25 mm (a hair or little more) between the block and the head the head.
5) screw the screws tight carefully checking the block is still at 0.25mm from the head.
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Pantaloon
Registered: Aug 2003
Posts: 124 |
this is too fun :) keep it going! |
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sailor
Registered: Jan 2002
Posts: 90 |
Regarding Commodore and alignment, one need to check the "Commodore Diskette Diagnostic Manual" and/or its equivalent to 1571.
1541
1571 |
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Zibri
Account closed
Registered: May 2020
Posts: 304 |
Quoting sailorRegarding Commodore and alignment, one need to check the "Commodore Diskette Diagnostic Manual" and/or its equivalent to 1571.
1541
1571
Yep. Both use both software checks and oscilloscope "cat eyes" check.
I think there might be a way to do this fully in software and I am exploring the possibility, but I think the emulator won't help in this case and I will need to wait to get the hardware to make some more tests. |
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Zibri
Account closed
Registered: May 2020
Posts: 304 |
Quoting Pantaloonthis is too fun :) keep it going!
:) |
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sailor
Registered: Jan 2002
Posts: 90 |
I got the equipment to make a "factory quality" alignment with AAD and oscilloscope, It's the standard procedure for any drive really.. that's my recommended way of doing it.
I use the 1541diag alignment to get a hunch if the alignment might be an issue or not. (instead of pulling out an oscilloscope++)
A software solution will however be aligned to the drive which the disk, you use as reference, was written on.
Moving or adjusting the TR0 stop is not equal to aligning the drive. You may get a drive working that way if something has drifted, but its not aligning, and possibly not the root cause. |
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Zibri
Account closed
Registered: May 2020
Posts: 304 |
Quoting sailorI got the equipment to make a "factory quality" alignment with AAD and oscilloscope, It's the standard procedure for any drive really.. that's my recommended way of doing it.
I use the 1541diag alignment to get a hunch if the alignment might be an issue or not. (instead of pulling out an oscilloscope++)
A software solution will however be aligned to the drive which the disk, you use as reference, was written on.
Moving or adjusting the TR0 stop is not equal to aligning the drive. You may get a drive working that way if something has drifted, but its not aligning, and possibly not the root cause.
That's true.
But in most cases, unless the drive falled from the table or had other strong shocks, the main reason of a drive misalignment is the drifting of the metallic belt over the stepper motor head.
This happens when you format a disk (or there is a track 0 bump due to errors) when the drive is hot.
After asking to a few service center technicians, I heard that this was the problem in most cases. |
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Zibri
Account closed
Registered: May 2020
Posts: 304 |
Quoting sailor
A software solution will however be aligned to the drive which the disk, you use as reference, was written on.
This is not entirely true.
Since the head can't physically go further than a certain point, I think there can be a way to determine where it really is buy writing special tracks at the extreme borders and do some clever reading. But I am not sure. |
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SLC
Registered: Jan 2002
Posts: 52 |
Quote: Quoting sailor
A software solution will however be aligned to the drive which the disk, you use as reference, was written on.
This is not entirely true.
Since the head can't physically go further than a certain point, I think there can be a way to determine where it really is buy writing special tracks at the extreme borders and do some clever reading. But I am not sure.
Uhm.. yeah, the head stops into the Track 0 stop. But you won't know if that is correctly positioned. Also, even if track 0 stop is correctly set and you truly cannot push the head any further, the alignment itself may STILL be off and affect how far out you can read/write on the physical floppy. |
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chatGPZ
Registered: Dec 2001
Posts: 11120 |
If you dont fix the root problem, moving the head stop will only make the problem even worse (after a short time). As said, it's the bedroom tinkerer method. You only ever even touch the head stop *after* you have properly aligned the drive using testdisk and scope (and that is what happened in service centers). and what sailor said :) |
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Zibri
Account closed
Registered: May 2020
Posts: 304 |
Quoting SLCUhm.. yeah, the head stops into the Track 0 stop. But you won't know if that is correctly positioned. Also, even if track 0 stop is correctly set and you truly cannot push the head any further, the alignment itself may STILL be off and affect how far out you can read/write on the physical floppy.
I was referring to track 42, not track 1. |
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