8271 disk-controller  Pinout

<-- TRST 1 U








    8271    
Disk
Contr
40   Vcc
<-- SELECT Ø 2 39 LOW CURRENT  
--> 4 MHZ CLOCK 3 38 LOAD HEAD --
--> RESET 4 37 DIRECTION -->
--> READY 1 5 36 SEEK/STEP -->
<-- SELECT 1 6 35 WR ENABLE -->  
--> !DACK 7 34 INDEX  
<-- DRQ 8 33 WR PROTECT <-- from drive
--> !RD 9 32 READY Ø <--
--> !WR 10 31 TRACK Ø <--
<-- INT 11 30 COUNT UP 1 <--
<-> 12 29 WR DATA -->
<-> D1 13 28 FAULT <--
<-> D2 14 27 RD DATA <-- Unseparated Data
<-> D3 15 26 DATAW <-- Data Window
<-> D4 16 25 PLO / SS <--
<-> D5 17 24 CS <--
<-> D6 18 23 INSYNC  
<-> D7 19 22 A1 <--
  GND 20 21 A0 <--

Data Sheet

For full details see the 8271 Intel Floppy Drive Controller data sheet (Zipped TIF)