Re: [cbm4linux-users] XMP1541 parallel Problems

[Andreas <co...@c6...>]

Freitag, 23. Mai 2003 08:12 wrote Michael Klein:

RE all,

> > - 1541 model II with 2.6 ROM, but has JD ROM aswell.
>
> Hm, does JD increase the stepper frequency?

Yes, I am almost sure it does, though not 101% :)
All my tests are done using the normal 2.6 ROM though.
The attached archive contains a short log of a few tried transfers.

> > d64copy -d 0 -t p -w 8 pw.d64
> >
> > it reads a few tracks fine, then bugs around and drops dead or skips
> > with an
> > error. Whenever it skips with the error message, it reads a few tracks
> > with
> > perfect speed again and bugs off again then.
>
> When does it start to bug: At the start of a track or in the middle?
> In the first case it might be because the head is moving too fast.

As said, I only used the normal ROM. The log has a JD try aswell, which
was 'feeling' faster on the OK-Tracks. It bugged out the same way as the 
normal ROM though.

The actual errors occur during or towards the end of reading a track. Rarely 
at the beginning. Seems to me during reads of the 10th to 20th sector.
Also the speed zones of the disk don't seem to matter much.
I am open for any other options ! :)
Will get my other 1541II back in a few days or so. Will try with that one 
aswell ofcourse.


WARNING: I CAN NOT recommend using JD or SuperJD along with StarCommander or 
cbm4linux for that matter. Especially SuperJD contains too many ROM changes 
and all modes seem to bug or fail. Normal JD Serial1 and Serial2 Transfers 
work with latest JiffyDos ROMs. SJD doesn't even respond to cbmctrl dir 8  
... :)

> Here's a script to adjust the head movement speed:
>
> #!/bin/sh
> cbmctrl listen 8 15
> echo -ne "M-W\005\034\003\064\000\064" > /dev/cbm
> cbmctrl unlisten

Ah, interesting way of telling the drive here stuff. :)
Didn't think of cbmctrl usage that way. The log shows though, that
there is no difference. Tried several values. :(

l8r
-- 
Count Zero/CyberpunX/SCS*TRC
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