DECmate III and Rainbow 100+

[Paul Koning]

> For the fdprm setting. Try ONE of the two following lines. I usually find
> the  second to usually work best on my hardware, but sometimes the
> first works better. comment out the line you do not use (# in front of 
> line).
> 
> rx50             800    10   1  80    0 0x25 0x01 0xDF     0x2E
> rx50             800    10   1  80    0 0x14 0x01 0xDF     0x18

Interesting.  The one I have used is different from both:

rx50   	         800    10   1  80    0 0x23 0x01 0xDF     0x50

I don't remember any analysis that went into those magic numbers (23
and 50) -- looking elsewhere in the file, it seems that I simply
copied them from the other entries that were "close" to the RX50
format. 

Someone who understands floppies better might be able to deduce the
correct timing parameters from the description in the PRO Technical
Manual, but it's above my head.

	paul