AT&T UNIX PC Ad - 1985

 from https://www.ebay.com/itm/285926452713

Publication source is not disclosed in the auction

RARE Ethernet card for the AT&T UNIX PC!

I have ONE...and now, czunit has ONE...we'll have to get together!

https://forum.vcfed.org/index.php?threads/at-t-7300-pc-adventures-in-installing-ethernet.1240403/

Click to jump to Ethernet at 1:12:55

Transferring files from the Unix PC (by Brandon Craig Rhodes)

https://rhodesmill.org/brandon/notes/unixpc/transfer.html

Compare this to what I did bumbling around on my own way back in 2014:

AT&T UNIX PC / 3b1 Disassembly Tutorials

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.

Nicest New-In-Box AT&T UNIX PC we've ever seen!

Preserved in Moscow...

 

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And the SECOND nicest New-In-Box UNIX PC we've ever seen:

https://dontgotothis.website/projects/unix_pc

Full Picture Suite on Google Pictures