[Coco] Disk Drive FD 501 Floppy

[Gene Heskett]

On Wednesday 17 April 2019 15:15:41 Melanie and John Mark Mobley wrote:

> I bought some super tech (TM) multi-duty complex hi temp applications
> (red) grease for Walmart.
> I put the grease on the rods that hold the read head and let the read
> head slide back and forth.
> This did not fix the issue.
> I swapped drive 0 for drive 1.  I swapped the termination resistor
> pack.  I swapped 3 jumpers on each drive.  And now drive 0 will boot
> OS9 without a warm up time.
> There is one variable resistor on the drive, but I do not know what it
> does or how to adjust it.
> I do not now know how to test dive 1 as I can only boot from drive 0. 
> DOS 1 starts booting from dive 1 but then switches to drive 0. 
> Perhaps I need a different boot disk.
>
> -John Mark Mobley
The termination resistor pack ALWAYS goes on the last drive on the cable. 
Otherwise the last drive will be an open circuit echo, playing hob with 
the data.  The variable resistor, is probably a spindle speed trimmer. 
If there is a black and white strobe  pattern pasted on the bottom of 
the spindle, trim it until the ghost of the stripes as its running, is 
standing still under a flourescent lamp.

Cheers, Gene Heskett
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