TEAC FD-55B Floppy Drive Jumpers for the AT&T UNIX PC

UNIX PC Jumpers in position

DS0 - Drive Select 0

HM - The head is selected by the signal MOTOR ON.

IU - signal interface line #4 IN-USE input signal = Indicator LED turn-on condition 

                                                                               Drive Select + In-Use

SM - SM allows the use of jumpers HS or HM.

PM - The spindle motor will rotate at the time the floppy is installed.

https://retrocmp.de/fdd/teac/TEAC_FD-55_Jumper-settings.pdf

To use with Jim Drew's SuperCard Pro, must change jumper DS0 to DS1

Set at DS0

Set at DS1

AT&T UNIX PC Hardware/Screws

 

Your "main" screws (group of 3 on the right) are a standard, called a "#8-32"

This means a hole size #8, and 32 threads to the inch.

Length is almost exactly 1 centimeter (3/8 inch)

So, all 6 screws on the left, and all 3 on the right are this size, just different length (1/4 inch).

And the ones on the left have the "star" washers installed.

#8-32 3/8 in

https://amzn.to/3HXqkVf

And

#8-32 1/4 in

https://amzn.to/3rRgkXY

And 

#8 Star Washers:

https://amzn.to/34WeKLw

And these should be the long screws that hold the back of the 2 halves of the plastic case together:  

https://amzn.to/3Bp1kDS

The smallest ones in the middle-front of the above picture I have yet to measure and document.