Ethernet Expansion Card for the AT&T UNIX PC

Highest resolution photos are hosted on Google Drive Here

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

Adrian's Digital Basement unboxes an AT&T UNIX PC 7300!

A Color AT&T UNIX PC???

The following are excerpts and hyperlinks to a thread named 

SVR3.5 + source code 

on the comp.sys.3b1 message board archive by Google:

The very first comment about a Color UNIX PC came from 

Clarence Dold on November 6, 1998.  

(Clarence Dold is a name I've known since our very first year of "the MightyFrame journey", 2014...)

"If it's the same guy that had the color UnixPC..."

Joe R. replies (appropriately)

"A color Unix PC? Tell me more!"

To which Ward Griffiths replies:

> >If it's the same guy that had the color UnixPC...

>

> A color Unix PC? Tell me more!

To the best of my knowledge, there were three prototypes built of what

would have been the next version of the Unix PC. 68020. SIMM sockets

for 16MB. Color tube. Socket for math coprocessor. 2400 modem. I

forget what else. Brian salvaged one on its way to the dumpster. It

had a debug ROM, not a boot ROM, and a boot ROM from a stock Unix PC

did not work. Project aborted when AT&T pulled out. A damned shame.

-------------------------------------------------------

Ward Griffiths lists contact information at http://www.cnct.com/home/gram/, which has been a dead domain for many years now.  However, we can thanks the folks at The Wayback Machine for archiving what it USED to look like...

On it was posted Ward Griffiths' Resume

In context to the topic here, most noteworthy on his resume is:

Unisys Corporation, San Jose CA, Software Design Verification Engineer, 1990-1991:  Tested and verified Unix operating system software and utilities for functionality, stability, reliability and conformance to company internal design specifications and industry standards including AT&T SVVS, X/Open and POSIX.  Tested for compatibility with third party application packages designed to operate with previous releases of Unix by Unisys and other vendors.

Which puts him at the right place, at the right time, to have good contextual (if not first-hand) knowledge of what he speaks regarding the Color UNIX PC.

Can any more be learned from reading the details of this entire thread, in context?  Perhaps.  You, the reader, decide, and let us know what you think....

OH, and for entertainment, let's not neglect to view the original CNCT.COM in it's full vintage glory...

*Note*:  It appears that some (not all) of the messages in this particular "SVR3.5 + source code" thread are archived out of original order by groups.google.com.  In some messages, quotes of things said appear above what appears to be the original message where they were said.  Looking at the time stamps, every message is time-stamped 2am, which indicates a possible loss of original timestamp somewhere in the archival process from the original platform(s).  This is only my speculation.

WordStar 2000 for the AT&T UNIX PC

https://forum.kryoflux.com/viewtopic.php?t=1562

2020-12-15 I just posted a follow up asking if the install disk streams were ever made available.

Check back manually for a reply

Adding a Second (2nd) MFM Hard Drive to the UNIX PC

ICUS II Hard Disk Upgrade
Written by Gil Kloepfer, Jr. & Lenny Tropiano

On Archive.org/web in case it disappears.

At least one of several threads on COMP.SYS.3B1

Also referred to as the ICUS II "P5.1" hard disk modification

And evidently it was just done in December 2021 by shirsch as reported on vcfed.org

And this article references Gil Kloepfer, but talks about adding up to FOUR drives?

https://stason.org/TULARC/pc/3b1-faq/5-6-Can-I-put-a-larger-hard-disk-drive-in-the-UNIX-PC.html

2023-12-02 Update:  Did we just find one of these mods "in the wild"???

Courtesy e2k over Discord

3B1 Emulator

 

https://github.com/philpem/freebee

AT&T 3B1 Source Code

Enhanced diagnostic disk image for use with freebee?

RARE Vintage AT&T UNIX PC COMPUTER Lapel pin

 

I just thought it was cool...but not enough to actually pay for it...

AT&T UNIX PC Ask Me About The Connection Large Vintage Pinback Button #BB1805

I've been watching this button on eBay since at least September 9, 2015.  Well, miracles never cease, it sold just a few days ago, February 16, 2019.  Wow!  That was a tough sell.  But, I tip my had to the seller...for pure perseverance!

Here's the auction archive

Expansion Card Slots - AT&T Unix PC

If you are listing an AT&T Unix PC on eBay, Facebook Marketplace, CraigsList, etc., you may hear from me asking about adding pictures to your auction/listing to show the expansion card slots.

A lot of people miss taking pictures of these, because they are hidden relatively out of sight.

However, with my collection of UNIX PCs, what is (or is not) in these expansion card slots is what I use to decide how much money I will bid/pay for the machine you may be selling.

So, to help, the below pictures should show exactly where these 3 expansion slots are located on all AT&T UNIX PCs (And Convergent Technologies S/50s)

Thank you so kindly for your help in providing these.

Best Always,
Forgotten Machines

dontgotothis.website NICE UNIX PC NIB Documentation

https://dontgotothis.website/projects/unix_pc

https://photos.google.com/share/AF1QipO5CGMDsw9xSm5toW01OxCoFJ0WMnnRUKgMilSmTT-W0sJF7og7mfMZ3GWfL60mjg?key=WWh0LUUxZFNwSWRIRTkyS0pGTS1HTTgtbGdFU1Zn

UNIX PC: Game of Larn

Has anyone else ever seen this game on a UNIX PC?  
Did this ever come with the factory software package?
If not, where would this machine have acquired such a luxury?

https://www.ebay.com/itm/232942234487

UNIX PC's TEAC FD-55B drive

FD-55B-01-U

http://www.vogonswiki.com/index.php/Teac_FD-55_series

AT&T UNIX PC Keyboard Signal Decoding

Here is the proprietary (and rather rare) UNIX PC keyboard:

The keyboard is manufactured by CORTRON.  

Part No. 25-500257

Cust No. D-02-00092-00

Since the keyboards themselves can be SO expensive:

http://www.ebay.com/itm/321811279287

Using this method:

Let's decode all keys on the proprietary UNIX PC Keyboard.


VERY good info on comp.sys.3b1 on hacking the keyboard hardware.


And Chris Smith has found the pinout from the Reference Manual.

Plug Configuration:

  5 6 7 8 
  : : : : 
  1 2 3 4 

KBDTXD     --JK-7 
GROUND     --JK-1,2,3 
+5V        --JK-4,8 
KBDRST     --JK-5 
KBDRD      --JK-6 
Chassis Ground to  JK-shield 

with "JK" being the jack on the system board into which the keyboard 
plugs. 

I inquired over at Deskthority.net

DoN Nichols shares golden information on comp.sys.3b1 about how to reverse engineer these keyboard signals:

And today, Cpro provided this golden URL:  https://peterbjornx.nl/vtkbd/

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Now, notice that this Tektronix keyboard seems to have the same proprietary plug end as the Unix PC's keyboard.  It doesn't have the right-angle end where the cable comes out of the connector housing, but the physical connector is the same.  Is this a coincidence?

Below From Tektronix 119-2468-03 Terminal Keyboard