Re: Two 1541-II drives with problems

Hello Spiro.

Here's a short reply, too late for intensive testing now.

Sorry if I forgot to mention the ZoomFloppy. I'll send you the ROM, Spiro. It didn't take very long to transfer, and yes, it is 16384 bytes. Didn't do file comparasion as OS X's terminal didn't accept it as fc /b, didn't go to search for correct syntax now. It is a 1541-II (as per the topic).

If I run the cbmformat command, I can see that the drive head makes a very little step (but won't move anywhere). Spindle runs for a second or two, drive light comes up but then it stops (looks just like it resets) and ZoomFloppy leaves on blinking (cbmformat halts, but gives no errors or anything). I can't get any error messages as giving cbmctrl status 8, it notices that the previous command was interrupted, and does a full reset. Attempting a cbmctrl dir 8 just makes the drive run (both lights on) and it goes on forever (ZoomFloppy starts blinking).

One thing I also wonder: if I power up the drive with a floppy in and the door closed, it keeps running and both lights stay up. That sounds weird, I don't remember 1541s doing that? If I open the drive door, it stops. How can it see when the door is open, I thought this doesn't have a disk sensor?

I have now also socketed the DC 6522 VIA, and replaced it with another one. Still no chance. But, couple of times today cbmctrl showed me "drive not ready", which was something new. But then it went away again, almost like a bad contact somewhere. I am really getting a bit lost now, so many chances what might be wrong with this :/

--
Ville


Spiro Trikaliotis <ml-cbmhackers@trikaliotis.net> kirjoitti 23.4.2014 kello 22.22:

> Hello Ville,
> 
> * On Tue, Apr 22, 2014 at 07:49:28PM +0300 Ville Laustela wrote:
> 
>> I made a test over ZoomFloppy (from WinVICE) and the drive 1 of the two drives.
> 
> If you told me that you have ZoomFloppy, I would have said to issue
> 
>        cbmctrl reset
>        cbmctrl status 8
>        cbmctrl status 8
> 
> from a command line window in order to see the same output. You could
> not have to type in the "program" in WinVICE.
> 
> But, while you have OpenCBM, you might want to try to issue
> 
>        cbmctrl download 8 0xc000 0x4000 ROM.BIN
> 
> (note: This command needs some time (2 minutes, IIRC) to execute, so
> keep patient!)
> 
> and have a look into the resulting file "ROM.BIN". It should be exactly
> 16384 byte long.
> 
> You could also retry this command multiple times. For this, issue the
> following two commands again and again:
> 
>        cbmctrl download 8 0xc000 0x4000 ROM2.BIN
>        fc /b ROM.BIN ROM2.BIN
> 
> Each time, fc should output that the files are identical.
> 
> If this test works, then you can be (almost) sure that the IEC part (the
> communication part) is actually working.
> 
> 
> Now, having verified this, you can try to check the drive itself. This
> is the hard part. You could try to format a disk (either with 
> 
>        cbmctrl pcommand 8 n0:test,00
> 
> or with
>        cbmformat -p 8 test,00
> 
> Personally, I would prefer cbmformat.)
> 
> Does the head bump now? Does the stepper move in any way?
> 
> Why do I want to format? Because format will bump the head even without
> reading from the disk beforehand. Thus, if for example S.O. is not
> working, your drive should at least bump and thus, move the R/W head.
> 
> BTW: What 1541 drive is it? 1541, 1541-2, 1541C? It would be best if you
> could also send me the ROM.BIN file from above. The reason why I ask: I
> want to know if your drive has the "track 1" sensor or not. This might
> change the way the head bumps.
> 
> 
> There would be possibilities to do even more checks with software, but I
> doubt that software does not exist yet.
> 
> 
> 
> Regards,
> Spiro.
> 
> -- 
> Spiro R. Trikaliotis
> http://www.trikaliotis.net/
> 
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