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A > ATT > Unix PC     

Unix PC

The AT&T UnixPC was AT&T's attempt to get into the business computer market of the mid-1980s. There were two flavors of this machine: the 7300, and the 3B1. Basically the circuitry is identical in both machines however the 3B1 allowed more room for hard-drive storage, as shown with the ominous bulge underneath the screen. (not shown in model above).

The windowing manager was absolutely wonderful keeping the UNIX system well hidden, however, you could naturally open a shell and interface directly. The graphics system was neat as well - there is a 3D bitmap demo online somewhere.

These computers could support 3 terminals with an add-on card for concurrent use by up to 4 users (one at he console, one on the built-in port, and one each on the two add-on ports).

The keyboard could be "nested" on the shelf in front of the floppy drive. The sound was limited to beeps.

There was also an add-on board with a speech synthesizer which could turn the UnixPC into a full-fleged voicemail management system.

An absolutely wonderful and advanced computer for it's time, which can still teach modern computers a lesson in innovation.


Contributors: Domenic Schipani, Gary Clouse

We need more info about this computer ! If you designed, used, or have more info about this system, please send us pictures or anything you might find useful.



This is such a fantastic machine. I''ve had one for several years now. Unfortunately shortly after receiving it in working condition, I could not help but to open it up to see the insides. This was a difficult machine to get open, and somehow I have managed to do something to it. It no longer boots, and I do not have the OS to try to restore it to working condition.

Wednesday 3rd November 2010
Aaron Lochard (USA)
Indy Tech Expert

One of my experience in computing!

Very innovative piece of equipment, could handle phone calls, very versatile.

Wednesday 4th August 2010
Laurent LATHIEYRE (Paris, France)

I used these systems in the UK when I was employed by Computer Automation.
We had difficulty persuading users to shutdown properly so regular reinstalls were needed from 33 (or so) floppy disks. I believe that this is a variant of the Convergent Technologies Unix PC?

Tuesday 27th April 2010
PeterG (UK)


TYPE  Professional Computer
YEAR  1985
BUILT IN LANGUAGE  Bourne Shell Scripting, C and ASM with optional Software
KEYBOARD  Detachable 103-key QWERTY
CPU  Motorola MC68010 (16 bit external bus, 32bit internal) with custom MMU
CO-PROCESSOR  Custom Gate Arrays for DMA (3), 8088 (86?) on optional DOS-73
RAM  512 KB / 1 MB / 2 MB / 4 MB
ROM  16 KB EPROM holding Boot Strap, Diagnostics etc.
TEXT MODES  80 columns x 29 rows
GRAPHIC MODES  348 x 720 on built-in 12'' Monitor
COLORS  Green On Black Monochrome
SOUND  Beeper
I/O PORTS  Centronics, RS-232c, Tip/Ring Line Modular Phone Jacks (2), RJ11 Phone Jack (1). Internal Expansion Slot (3), Internal 300/1200 bps modem
BUILT IN MEDIA  10 or 20mb hard drive then later 40 and 67mb hard drive. 5 1/4
OS  AT&T Unix v3.51, Unix based on System V r2 with extensions from BSD 4.1, BSD 4.2, SysV r3 and Convergent Technologies
PERIPHERALS  Three button optomachanical mouse
DOS-73 board, 512kb RAM board, 2mb RAM board, Dual EIA Port board
EIA/RAM Combo board
23 MB Tape Drive
PRICE  $5590 for 10mb HDD, 512Kb RAM and Unix
$6590 for 20mb HDD, 1mb RAM and Unix
$1195 for 512kb expansion card



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