Search Posts:

AT&T 6300 Restoration

SHARE

Return to Threads

  AT&T 6300 Restoration by Bill Degnan - 07/15/2008 23:09
Cobbled together a system from spare parts, but it's 100% AT&T stock for the 6300. I had trouble with the display for a while, but it revived itself.

The system came to me with generic DOS 4.01.

Decision time If my goal is to return the system to its original state which OS should I install given the following....?

[a] The manual states that DOS 3.1 was shipped with the system.

[b] The original AT&T 3.1 boot disk is missing. I only have the 2nd (supplemental/operating) diskette.

[c] What I do have:
AT&T 3.3
or
MS DOS 3.1

DECISION
I decided to go with AT&T 3.3, because manufacturer trumps version IMHO

________________________

Two more interesting things.

[1] When the system boots, the system runs Resident Diagnostics Rev. 1.21 ...
at C800:0000

At&T 6300 boot screen when optional ROM present

[2] The ROM reports "fixed disk not present" - yet there is a hard drive and the system boots just fine.

pics

Reply
  A few pointers by Jack Harvey - 08/10/2008 08:26
Hello Bill, Yzzerdd here.

You mention that the AT&T PC 6300 runs Resident Diagnostics AT C800:0000. Instead, C800:0000 in this(and most cases) is actually the address of your optional HDD. Every PC 6300 comes with some sort of resident diagnostics at boot-up, ranging from 1.0 to 1.48.

When your 6300 reports not finding a fixed disk present, it does so because you've got a DIP switch set wrong for the hard drive. Try changing SW3 on DIPSW-1 to the opposite position it is in now.

If your goal is to return it to the original state, depending on the systems date, you should use either DOS 3.1, 3.2, or 2.11. Let me know if you need any disks from any of those suites, as I can help you with that. Also, I have the fix to the clock program, which allows you to set the date past 1991. Let me know!

Reply
  SW3 #1 to control hard drive by Bill Degnan - 08/10/2008 10:22
Jack,

Excellent; I will alter the switch.

My earlier post describes how I came to the decision for restoring the OS. I believe because I have original AT&T v. 3.3 disks, although a higher subversion of the shipped OS, trumps a *copy* of AT&T 3.1. Just a personal preference. I fully acknowledge the contrary argument. The whole subject of the best way to restore a computer is of interest and I am always looking for opinions. I plan to get into this topic as a full column issue of this web site, some day.

I have the clock fix, but I did not mention this in my post. Thanks for the offer though.

I have visited your new web site, but for the benefit of anyone who is looking for more AT&T 6300 info, here it is:

http://sites.google.com/site/att6300shrine/Home

Reply

Resources:


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
  • IMSAI 1.4 BASIC vs. MITS 8K BASIC
  • 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:


    ADDS Regent 20 w o numeric

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