Friday, August 5, 2022

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.



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

Set at DS0

Set at DS1




Wednesday, February 16, 2022

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

And

#8-32 1/4 in

And 

#8 Star Washers:


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


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

Monday, November 29, 2021

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: