RE: Please help with Catweasel Reed-Contact

From: Gideon Zweijtzer (
Date: 2005-08-13 11:46:16

Hi Antitrack,

Using a reed-contact seems to me like a very unreliable and inaccurate
way of doing such a thing. I don't think a reed-contact is ever meant to
be used for the generation of timing pulses.

Why don't you use a hall-sensor instead? They come in very small casings
(a lot smaller than reed-contacts), and because they do not have any
moving parts, they're faster and more accurate, too. You might need a
resistor or two to apply the right bias, but it will pay off.


> -----Original Message-----
> From: 
> [] On Behalf Of 
> Sent: Friday, August 12, 2005 22:38
> To:
> Subject: Please help with Catweasel Reed-Contact
> Howdy Hackers :-)
> I need a bit of help with reading the second diskside of 
> 1541-disks in Catweasel 
> drives. 
> You probably remember that you have to mount a magnet and a 
> reed-switch to the 
> PC drive in order to replace the light resistor/index hole stuff. 
> However, I've got some bad experience with several reed 
> contacts - it seems they 
> sometimes miss the magnet and thus don't do the pulses 
> properly. If someone got it "properly" please grab your 
> oscilloscope and tell me how the 
> normal light diode/resistor pulses ought to be like in timing 
> and duration (i.e. 
> length of pulse). And please recommend me a reed-switch that 
> is reliable - I 
> have tried several, none of them being reliable enough to 
> generate the pulses.
> If you know any other method of replacing the indexhole/LED 
> stuff on the PC 
> drive, please let me know.
> Another question - I guess some of you have the IDE64, which 
> now can use CF 
> Flash cards instead of IDE drives. Great stuff. I think it 
> would be cool to make 
> an 8 sec GCR copy that copies a whole 1541 disk image to 
> IDE64 - is there such a 
> tool already? If not I'll do it (but first I need to know 
> where to buy a IDE64 
> and how much it costs). 
> Yours
> --------------------------------------
> Ein Service von
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