FILE: floppypinoutinfo.txt HTTP://www.iki.fi/mkl/dcn.html Notes: The DD-drive used in 1581 has slighly different pinouts than "PC-drives". The same type of drive that is used in 1581 is also used in the Amiga 500. "PC-drives" have disk change signal on pin 34, and 1581 drive has it on pin 2. 1581 drive has "ready"-signal on pin 34. Pin 3 can be a key-pin and removed from the pin header connector. ----- This 1581 PCB-connector info is collected from schematics page 16 ----- ----- of "Service Manual, 1581, 3.5" Disk Drive, June 1987 PN-314982-01" ----- Pin 1 not connected in this schematic Other odd numbered pins 3 trough 33 are grounds _________ / \ |1 2| /Disk change |3 4| n.c. |5 6| n.c. |7 8| /Index pulse |9 10| /Drive select grounded |11 12| n.c. |13 14| n.c. |15 16| /Motor on |17 18| /Step direction |19 20| /Step |21 22| /Write data |23 24| /Write gate |25 26| /Track 0 |27 28| /Write protect |29 30| /Read data |31 32| /Side 0 |33 34| /Ready \_________/ ----- This is a cut from "Pinouts for various connectors in Real Life" ----- ----- Notice that the signals that are active low are not marked as such ----- 6.5) Floppy 6.5.1) Floppy Disk Controller IDC-34 Male pin assignment pin assignment 1 GND 2 Density Select 3 GND 4 (reserved) 5 GND 6 (reserved) 7 GND 8 Index 9 GND 10 Motor Enable A 11 GND 12 Drive Sel B 13 GND 14 Drive Sel A 15 GND 16 Motor Enable B 17 GND 18 Direction 19 GND 20 Step 21 GND 22 Write Data 23 GND 24 Floppy Write Enable 25 GND 26 Track 0 27 GND 28 Write Protect 29 GND 30 Read Data 31 GND 32 Head Select 33 GND 34 Disk Change