🚀 go-pugleaf

I just put a 3.5" flopply in my Rainbow.  Here are some of the things
that I noticed:

	1) If you just plug it in right out of the box, and format it,
	   then you have a 3.5" RX-50.  You can boot off of it and put
	   files on it.  One side 400K.

	2) The rainbow really wants to have BOTH an A and a B drive in
	   order to boot w/o errors.  It appears to be safe to ignore
	   the error about "Drive A" not repsonding when the 3.5" guy
	   is setup as drive "B".

	3) The second connector uses the SELECT 0 edge for drive C and
	   SELECT 1 for drive D edge.  So there is no need for a
	   "special" cable for drives here (except that it needs to be
	   longer than the "standard" RX-50 cable).

	4) It appears to be possible to specify the head to use for
 	   the drive, but this will require some driver hacking to
	   make it useful, so it may take me a while.

	5) DOS supports a head number for the floppies through IOCTL
	   and INT 65.

Please note that this is the low density 720K drive that I'm doing
this with.  The 1.44M floppy doesn't want to work in my Rainbow out of
the box, so I'm not sure what to do with it.

Cables are just 34 pin ribbon cable straight through.  You can get
the parts at Radio Shack for about $10.00.  This doesn't include
shielding, however.  I don't know why exactly it is needed, but the
RX50 cable that I have has lots of it on the cable.

You may need to figure out how to get more power drops inside the
Rainbow.  I haven't done this yey, but it looks easy.

Now that SS is gone, is there any interest in a PD double sided driver
for the Rainbow?

Warner
--
Warner Losh		imp@Solbourne.COM
Boycott Lotus.		#include <std/disclaimer>