[Coco] drive motors

[Gene Heskett]

On Friday 12 July 2013 20:02:50 goosey did opine:

> >or not you are accesssing disk 0 or disk 1, drive motors on both
> >drivesآ 
> 
> spin?آ 
> 
> CoCo operating systems expect this behavior. If your drives aren't set
> up that way it can lead to corrupt disks (supposedly away). آ 
> 

Not generally can, but will, Willard.  The floppy drivers do not have a 
spinup delay before writing except after the initial motor on is issued.  
So as long as the motor is on, it assumes ALL spindles are up to speed.  So 
a disk to disk copy where the individual drive starts on drive select is a 
nice way to write a sectors worth of data in 1/3rd the track space because 
its written before the disk is up to speed.  Modern pancake motor drives 
are up to speed in <1/4 turn, but the older belt driven drives will have a 
sign out, saying disk data wrecked here.

Cheers, Gene
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