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| From: Nicolas Welte
Date: 2002-01-10
Subject: Re: R: R: 1551 adjust & align
|
Almos Rajnai wrote:
>
> Hello!
> On 9 Jan 2002 at 17:48, C.M.Scortegagna wrote:
>
> > The light sensor you spoke about, is that one
> > which finds disk changing (insert / output) or that
> > one which finds the little hole in each disk as
> > start of sectors?
>
> Both can cause such effect.
I don't agree here. The 1541 and 1541 have only one optical sensor to see if the write protect notch of a disk is open or not. The same signal is also used to create a logical disk change signal, but this sensor can not be used as a disk present signal. There is no index hole sensor, and there is also no track 1 sensor (except in some 1541Cs).
Of course, if that sensor is bad, the drive might think the disk is write protected and return a write protect error (enter PRINT DS$ to check).
Nicolas
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