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Forums > CSDb Entries > Release id #194046 : 1541 Speed Test
2020-08-07 10:01
sailor

Registered: Jan 2002
Posts: 84
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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2020-08-24 23:59
Zibri

Registered: May 2020
Posts: 148
Is not so important.
But I saw that gpz is modifying some code in 1541 emulation and I thought this might be of help.
Sincerely I never check all sources and I didn't setup a build environment for that behemot to be compiled.
I was just reporting.
2020-08-25 00:00
Zibri

Registered: May 2020
Posts: 148
Quoting Krill
There's also a public test result matrix where no emulator passes each and every test, iirc.

Where? I am curious to see that.
2020-08-25 02:26
Adam

Registered: Jul 2009
Posts: 274
Quote: Oh.. so you show yourself!
Go back to your lair.
There's no food for you here.
Lamer? 8 million people think otherwise.
WTF you think you are? Just a loser downvoter.
I don't care about ranking at all.
It makes me just laugh there is people so "little" around.


this was the exact reaction i was hoping (and expecting) to receive. you didn't fail to disappoint me or others, zibri. :D

> I don't care about ranking at all!
> *50yo man proceeds to cry like a child to everyone that his lame tool got downvoted*
> 8 million people think otherwise!!!1111

:D absolutely beautiful. cry harder, lamer.
2020-08-25 03:42
Zibri

Registered: May 2020
Posts: 148
Quoting Adam
this was the exact reaction i was hoping (and expecting) to receive. you didn't fail to disappoint me or others, zibri. :D

> I don't care about ranking at all!
> *50yo man proceeds to cry like a child to everyone that his lame tool got downvoted*
> 8 million people think otherwise!!!1111

:D absolutely beautiful. cry harder, lamer.


Bye loser.
2020-08-25 10:05
Krill

Registered: Apr 2002
Posts: 1839
Quoting Zibri
Quoting Krill
There's also a public test result matrix where no emulator passes each and every test, iirc.

Where? I am curious to see that.
https://vice-emu.pokefinder.org/index.php/Testbench#Results
2020-08-25 17:31
ChristopherJam

Registered: Aug 2004
Posts: 1131
Quoting 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?
2020-08-25 17:33
Groepaz

Registered: Dec 2001
Posts: 9792
Indeed, another testprog that shows a scatter plot / deviation over time in some way is needed for this.
2020-08-26 08:19
Zibri

Registered: May 2020
Posts: 148
Quoting ChristopherJam
Quoting 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.
2020-08-26 11:08
Groepaz

Registered: Dec 2001
Posts: 9792
As said, a testprogram is needed that allows to properly see what happens. Guessing doesnt help :)
2021-04-06 14:45
Zibri

Registered: May 2020
Posts: 148
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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