Search Posts:

AT&T PC 7300


Return to Threads

  AT&T PC 7300 by Bill Degnan - 01/02/2010 10:17
This AT&T PC 7300 was donated for study. The AT&T PC 7300 UNIX Computer from 1985. Serial Number 370429020 000139

So far I have tested the power and the memory, all OK. System originally booted up, but I did not have any login info so I decided to format the drive and re-install the OS from disks. There is a minimal OS 3.5.1 loaded for the moment. Doing research to determine next best action.


  Installing an ST-251 into a AT&T 7300 by Bill Degnan - 01/06/2010 10:18
The ST-251 does not appear on the options when initializing a hard drive from the diagnostic menu. I chose "other drive" from the option. The ST-251 has the following specs:

TRACKS 4,920

If you divide 4920 by 820 you get 6, which is the tracks per cylinder ratio. used 17 sectors/track. You need this number to correctly format the drive. [edited].

Anyway, after the format and surface scan completed (took over an hour), I re-installed UNIX 3.5.1 successfully and fully. Next I plan to install software and configure to my taste.

  Installing software UNIX PC 7300 by Bill Degnan - 01/08/2010 23:57
List of programs installed on this system from the SCORE! public domain archive

see filecabinet folder and look for man primitives for these.

Larn v12
Hack 1.0.3
Othello v 1.0
casino games
Star Trek
DHS (MS DOS Cmds for the Korn shell)
Big Ben
VCalc 1.3
Chess SHAH v 1.1
Crystal Cave Adventure

Form Maker 1.1 (note) - to run Office to set preference default of screen editor to: /usr/bin/vi
OR install the CT word processor. this is required by Form Maker. (done)

Steffens CScope [list man(1) and lpr(1) for help by typing "man(1) command]

HRDCPY (make sure usr/lbin is in path)
see usr/man/

U of Ariz's Icon programming language

VSpell - need to install development set first. (done). See /docs/vspell for info.

15 disk development set.
-document preparation
-enhanced editors
-development set
-virtual device interface - GSS Graphics C Language Building, etc.

NEXT - Test software, and determine how to get to the motherboard so I can replace the internal battery.

  Correction.. by Bill Degnan - 10/05/2014 09:55
Dave g sends hoihs corrections to my post:

4920/820=6 heads

It's tracks per cylinder not cylinders per track

  Video, Disassembly for repairs by Bill Degnan - 01/17/2018 11:01
Adding this thread for those who want to crack the case to get into the system.



Buy a Commodore Computer Poster

Popular Topics and FAQs

  • Commodore B Series Tips and Tricks
  • Aerocomp TRS 80 M 1 Expansion Unit DDC
  • Items Wanted
  • Lobo Max 80
  • Zenith Z-19-CN
  • Prototype PET 2001 photo
  • Using Toggle Switches to Analyze Memory
  • Commodore Disk Archive Project
  • PET 2001 Prototype at Gametronics 1977
  • Jim Butterfield Photo
  • IMSAI 8080 With Processor Tech. Cutter
  • Secrecy is the keystone of all tyranny
  • Cromemco System Three
  • Northstar Horizon - Boot Problem
  • Computer History and Restoration Links
  • Commodore BX-256-80 - 8088 Co-processor
  • S-100 board testing with Z-80 ICE
  • Donner 3500 - an early portable computer
  • Digital (DEC) PDP 11/05 NC Assembly
  • Univac 1219 rescue
  • Fido BBS listing node list 6-13-1986
  • PDP 8e
  • MITS 88-2 SIO (2SIO) for BASIC
  • Visual Technology Inc Model 1050
  • Amiga 2500 Restoration
  • The Evolution Of IBM Computers
  • Replacement teletype print hammer head
  • Archiving and Copying Software 101
  • Computers Built 1940 - 1950
  • CBM B-520 (a.k.a B256-80 or B500 256)
  • RCA COSMAC Microkit
  • Commodore 64K C-116 Mods
  • MITS 8800b Turnmon 9600 baud
  • Catweasel, 8in and 5 1/4
  • Raspberry Pi as Gateway to Internet
  • Digital PDP11 late 1969 early 1970
  • PDP 11/40 72 inch cabinet model
  • PDP 11/40 Industrial 11 model
  • Digitial MicroVAX 3100 30 System
  • Digital VAX 4000-200
  • Commodore 64 / 1541 DRIVEKNOCK
  • Booting the System Using RL02 drive
  • PACS: Reflections by Kathleen Mauchly
  • Tele-Graphic Computer Systems Inc.
  • Commodore B Series SID Jukebox?
  • Installing Core into PDP 11/40
  • Setting Up OpenVMS 7.1 DNS CLERK
  • Felt-Tarrant Comptometer Model J
  • NextStation Color
  • Digital Rainbow (PC100-B2)
  • 1970 Compusad Compulogical Tutor
  • Archiving Papertapes Using DSI NC 2400
  • 1976 P.C.C. Features the MAI JOLT 6502
  • 1961 Beckman DEXTIR Computer
  • UNIVAC 1 and UNIVAC File Computer 1
  • Past Issues:


    This image was selected at random from the archive. Click image for more photos and files from this set.