rcbaab@eutrc3.UUCP (Annard Brouwer) (12/01/88)
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 ---- X=================| the person |=====================# |name : Annard Brouwer | |BITNET : RCGBBAAB@HEITUE51 | |UUCP : rcbaab@eutrc3.uucp | | | | "WE APOLOGIZE FOR THE INCONVENIENCE" | | The Hitch-Hiker's Guide to the | | Galaxy | +----------------------------------------------------O