Floppy IBM and Shugart interface pinouts

+------------------------------+------+---------------------------------+
|            Shugart           | #PIN |               IBM               |
+------------------------------+------+---------------------------------+
| Disk Change Detect | /DCD    |   2  | /DSEL   | Density Select        |
+--------------------+---------+------+---------+-----------------------+
| In Use (OC-out)    | /INUSE  |   4  | n/c     |                       |
+--------------------+---------+------+---------+-----------------------+
| Drive Sel 3        | /DS3    |   6  | n/c     |                       |
+--------------------+---------+------+---------+-----------------------+
| Index              | /INDEX  |   8  | /INDEX  | Index                 |
+--------------------+---------+------+---------+-----------------------+
| Drive Sel 0        | /DS0    |  10  | /MOTORA | Motor A enable        |
+--------------------+---------+------+---------+-----------------------+
| Drive Sel 1        | /DS1    |  12  | /DS_B   | Drive select B        |
+--------------------+---------+------+---------+-----------------------+
| Drive Sel 2        | /DS2    |  14  | /DS_A   | Drive Select A        |
+--------------------+---------+------+---------+-----------------------+
| Motor ON           | /MTR_ON |  16  | /MOTORB | Motor B enable        |
+--------------------+---------+------+---------+-----------------------+
| Direction          | /DIR    |  18  | /DIR    | Direction             |
+--------------------+---------+------+---------+-----------------------+
| Step               | /STEP   |  20  | /STEP   | Step                  |
+--------------------+---------+------+---------+-----------------------+
| Write Data         | /WDATA  |  22  | /WDATA  | Write Data            |
+--------------------+---------+------+---------+-----------------------+
| Write Enable       | /WGATE  |  24  | /WGATE  | Write Enable          |
+--------------------+---------+------+---------+-----------------------+
| Track 0            | /T00    |  26  | /T00    | Track 0               |
+--------------------+---------+------+---------+-----------------------+
| Write Protect      | /WP     |  28  | /WP     | Write Protect         |
+--------------------+---------+------+---------+-----------------------+
| Read Data          | /RDATA  |  30  | /RDATA  | Read Data             |
+--------------------+---------+------+---------+-----------------------+
| Head Select        | /SIDE1  |  32  | /SIDE1  | Head Select           |
+--------------------+---------+------+---------+-----------------------+
| Drv Redy           | /RDY    |  34  | /RDY_DC | Drv Redy/Disk changed |
+--------------------+---------+------+---------+-----------------------+
| Odd pins 1,3,…31 = GND , #33 can carry signal (?)                     |
+-----------------------------------------------------------------------+