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From: hlevinsn@andromeda.rutgers.edu (Hank Levinson)
Newsgroups: comp.sys.apple2.usergroups
Subject: Re: Can I use an Apple II 5.25 floppy on a IIc Plus?
Date: 10 Jan 1997 13:56:00 -0500
Organization: Rutgers University
Lines: 69
Message-ID: <5b63c0$757@andromeda.rutgers.edu>
References: <32cc1a8e.22317731@news.iag.net>
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jboyer@interpose.com (John Boyer) writes:

>Do I just have to make a cable?

Dear John,

	There is a cable which allows Apple II 20-pin disk drives to be used on
19-pin ports such as the one on a IIc. I will describe the connections so you
can make one yourself or have it made for you. But first there are some details
of conventions to aid my description.

	There are two plugs, one at each end of the cable. One is a male 20-pin
header. The other is a DB-19 male. This latter plug is hard to find. I make it
from a DB-25 male plug from which the outer grounding lip has been peeled away.
This leaves the 25 pins no longer recessed. Three pins from each end may be re-
moved to leave the inner 19 pins which will fit into a DB-19 female socket.

	To speak about the individual pins, I will "draw" them below, as seen
from "outside" the plug. ("Inside" is where you solder the pins.)

	******************************************************************************


				    20- pin header
                                          ___
              ___________________________|   |____________________________
             |                                                            |
	     |	1     2     3     4     5     6     7     8     9     10  |
             |                                                            |
             |  11   12    13    14    15    16    17    18    19     20  |
             |____________________________________________________________|


	******************************************************************************


					DB-19
            _________________________________________________________________
            \                                                               /
             \  10    9     8     7     6     5     4     3     2     1    /
              \                                                           /
               \   19   18    17    16    15    14    13    12    11     /
                \______________________________________________________/


	You will be joining these two plugs back-to-back, so the numbers on the
first row of pins will line-up numerically. The connections are as follows:

			20-pin Header        DB-19

				1 ----------- nc
				2 ----------- nc
				3 ----------- 3
				4 ----------- 4
				5 ----------- 5
				6 ----------- 6
				7 ----------- 7
				8 ----------- 8
				9 ----------- 9
			       10 ----------- 10
			       11 ----------- 1
			       12 ----------- 11
			       13 ----------- 12
			       14 ----------- 13
			       15 ----------- 14
			       16 ----------- 15
			       17 ----------- 16
			       18 ----------- 17
			       19 ----------- 18
			       20 ----------- 19.

		Good luck!
				Hank