Re: 1541 Read error
Posted: Thu Oct 26, 2017 3:20 pm
I mean a loadstar or other disk without protection. I use a c64 to align the drives. Here is the software shown in the video: http://commodore.software/downloads/dow ... ent-system
The Commodore Vic 20 Forum
http://sleepingelephant.com/ipw-web/bulletin/bb/
http://sleepingelephant.com/ipw-web/bulletin/bb/viewtopic.php?t=8739
I was never able to format a 5.25" floppy disk in a 1541. Some people reported it caused the destruction of the R/W of the drive when they tried repeatedly.groepaz wrote:afaik there is no difference in the material, so that would be really odd (and isnt it a 1541 compatible drive?)
vs5.25 inch drives, 40 track (early drives 35 track)
...
Diskette and Media:
Mylar, 0.003 in thick (.0008mm)
iron oxide coating, 300 oersteds coercivity
same media for single and double density media
...
5.25 inch drives, 1.2M HD, 80 track
...
HD media: cobalt coating, 600 oersteds coercivity
orientation of index hole: see previous 5.25" description
...
The 1541 Technical Reference Pg 19 explains the procedure for head adjustment (not that I've ever done it).Floopy wrote:I have an oscilloscope, any solutions with that maybe?
WAT. you are not making any sense. and i was referring to the supposed difference of SD and DD disks - not DD vs HD, which we all know is different, of course.eslapion wrote:I was never able to format a 5.25" floppy disk in a 1541. Some people reported it caused the destruction of the R/W of the drive when they tried repeatedly.
simply said, just put the scope at the drive head and measure the amplitude. adjust for maximum amplitude with an "original" disk (test/demo disk is fine). you can probably read schematic when you own a scope so get them and perhaps measuring behind the r/w amplifier makes it a bit easier.Floopy wrote:I have an oscilloscope, any solutions with that maybe?
that sounds really odd - the 1541 is a DD drive afterallvicist wrote:No problem formatting and saving data to the sd disks but nothing doing with the dd ones which look brand new.
You didn't include a quote of what you were answering to...groepaz wrote:WAT. you are not making any sense. and i was referring to the supposed difference of SD and DD disks - not DD vs HD, which we all know is different, of course.
I just noticed that I see that I need to hook the scope up on pin 9 on UC1(or UC2 I don't remember), and pin 7,8 UF3. Note that I have a "short" board. I have a few "factory" disk, so I will try to calibrate the drive using them. I will have to borrow an oscilloscope with a sync feature though (mine does not have one) , so it might take a week or two to try this out.srowe wrote: The 1541 Technical Reference Pg 19 explains the procedure for head adjustment (not that I've ever done it).
The disk I is only as good as the drive it was made with, I only own one 1541 drive.norm8332 wrote:I mean a loadstar or other disk without protection. I use a c64 to align the drives[/url]
you can safely assume that if someone doesnt explicitly quote ... then he is directly answering to the previous post in the thread.You didn't include a quote of what you were answering to...
the second method described on that page equals the "ghetto method" using a scope. (creative way to do it too ) for this you need a factory written disk, not an "alignment disk".This site mentions a method with an alignment disk or commercially prepared. I guess that could be any bought software disk?
http://sunfishdesigns.com/tcr/cbm/1541.html?i=1
That's what I'll end up doing since I don't own an alignment disk. I'm guessing the original software disk should at least give me a somewhat aligned head.merser wrote:Do you have the maintenance manual?
This site mentions a method with an alignment disk or commercially prepared. I guess that could be any bought software disk?
http://sunfishdesigns.com/tcr/cbm/1541.html?i=1
There is generally more difference between different manufacturers than between SD and DD. Most manufacturers probably moved to the DD process once they had better oxides (its thinner and thus cheaper).groepaz wrote:afaik there is no difference in the material, so that would be really odd (and isnt it a 1541 compatible drive?)