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Here are the pin assignments of all the floppy drives of all Macintoshes.
A preceding slash (/) is used to indicate an active-low signal.
For the pinouts look at the end of this article.
If anyone wants to know a lot more of the hardware side of the different
Macintosh computers buy the book:
	 Macintosh Family 
	 Hardware Reference
	Addison-Wesley Publishing Company, Inc. 1988
	ISBN 0-201-19255-1.
All data in this article is taken from this book.

       	|  internal ports:                         		|
Pin no.	|Signal name(classic)	Signal name(SE)	Signal name(II)	|ext. port 
-----------------------------------------------------------------------------
1	 GND			GND		GND		 GND
2	 PH0                    PH0             PH0              GND
3	 GND                    GND             GND              GND
4	 PH1                    PH1             PH1              GND
5	 GND                    GND             GND              -12V
6	 PH2                    PH2             PH2              +5V
7	 GND                    GND             GND              +12V
8	 PH3                    PH3             PH3              +12V
9	 -12V                   n.c.            n.c.             n.c.
10	 /WRREQ                 /WRREQ          /WRREQ           PWM
11	 +5V                    +5V             +5V              PH0
12	 SEL                    SEL             SEL              PH1
13	 +12V                   +12V            +12V             PH2
14	 /ENBL.INT              /ENBL.HI or .LO /ENBL.1 or .2    PH3
15	 +12V                   +12V            +12V             /WRREQ
16	 RD                     RD              RD               SEL
17	 +12V                   +12V            +12V             /ENABL.EXT
18	 WR                     WR              WR               RD
19	 +12V                   +12V            +12V             WR
20	 PWM                    n.c.            n.c.             not available

note to pin 14:
- at the SE /ENABL.HI is the upper internal floppy drive and /ENABL.2 the
lower or the external one
- at the II /ENBL.1 is the lower internal floppy drive and /ENABL.2 the upper 


 internal floppy disk        external floppy disk
    |   20-pin ribbon header      |     shielded DB-19
    \/                            \/
1   O O   2                     1   O
3   O O   4                          O   11
5   O O   6                     2   O
7   O O   8                          O   12
9  |O O   10                    3   O
11 |O O   12                         O   13
13  O O   14                    4   O
15  O O   16                         O   14
17  O O   18                    5   O
19  O O   20                         O   15
                                6   O
                                     O   16
                                7   O
                                     O   17
                                8   O 
                                     O   18
                                9   O
                                     O   19
                                10  O


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