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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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Zibri
Account closed
Registered: May 2020
Posts: 304 |
Quoting ChristopherJamQuoting Zibri Groepaz
without I open a ticket, check the VICE code about the "Wobbling".
As it is is totally unreal.
It would certainly be useful to collect some statistics on how real drives with inconsistent speeds actually behave in practise - even just a typical oscillation period would be nice to know. You mentioned a sinusoid, but are we talking rising and falling every few seconds, or multiple times per revolution, or?
No idea.. I just saw some videos of people using my program and speed always changes of about +/-0.20 RPM but not randomly it seems (by naked eye) a fast sinusoid.
depending on the status of the rubber belt that wobbling can go from +/- 0.30 to even more... on very good maintained drive as low as 0.10 and on "no belt" drives is almost 0.00.
The wobbling depends also on the disk inserted.
A newer "out of the box" disk is stiffer than an often used one. So the wobbling is more pronounced with newer disks.
It also changes from disk to disk (probably due to friction caused by slightly different internal cleaning pads.
Sorry for the "non technical" description, this is just data I am gathering by watching videos of people using my program.
In the next days I should get a commodore 64 SX and a c64 with a boxed 1541. All in very good and tested condition.
I will do some more testing. |
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chatGPZ
Registered: Dec 2001
Posts: 11164 |
As said, a testprogram is needed that allows to properly see what happens. Guessing doesnt help :) |
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Zibri
Account closed
Registered: May 2020
Posts: 304 |
Update:
this new version does not write a test track on track #36.
It uses a standard dos formatted disk and does not write to it at all.
Same accuracy as before (but it will f*ck up if the disk is not formatted or non standard).
https://github.com/Zibri/C64-1541-Speed-Test/blob/master/rpmNOW..
The downside is that there might be inaccuracies if the disk was formatted by a slower or faster drive but as long as you format it with the same drive it will work. |
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