Archives and Resources
Univac Status Update
View Entire Thread
Return to Threads
by William Dromgoole
- 07/28/2016 08:51
At the May 7 workshop we modified one of the Univac 1532 I/O consoles to operate off of 115 volt 60 Hz power.
We did this by removing the 400 Hz transformer and rectifier assy and installing four Meanwell power supplies.
One each of 5 volts and 28 volts and two each of 15 volt. We also made wiring changes needed to still use all the original fuses.
One relay normally energized by 400 Hz had to be bypassed.
When tested it still did not work correctly.
First the model 35 Teletype was all jammed up but after generous lubrication it started to work.
We installed a new ribbon from our spares and the teletype worked ok from the keyboard.
Next we found that the capstan for the paper tape reader had turned to goo.
The paper tape punch always punches bits 0 and 1.
In early June I started building a three phase dummy load for testing the 400 Hz motor generator set we got from APL.
I ordered the proper mating military connectors for the Univac 1219 computer and the dummy load.
On July 3rd I went to the museum and removed the capstan from the I/O console and checked the others we have in the warehouse.
They were all in unusable condition. While I had access to the console paper tape reader I was able to clean all the residue from the gummy capstan and get it ready for a repaired part.
By July 9th I had finished the dummy load and was ready for testing the MG set.
On July 19th I purchased a piece of rubber/vinyl hose with a 1/2" inside diameter and a 3/4 outside diameter.
I cut a short section and put it on the cleaned capstan to test and see if it would work.
At the July 16th workshop we repaired the cabling and cleaned and documented the 400 Hz generator
It was wired for three phase wye 115/200 volts power output.
We rewired it for three phase delta 115 volts output to be compatible with the Univac 1219 computer.
We powered it up and connected it to the dummy load. We tested it at no load, 300 watts ,600 watts and 900 watts.
The rated output of the motor generator set is one KVA.
We tested it using thin jumper wires because we did not have the correct connector between the output jack and the computer power cable.
On July 17th we tried to install the new capstan but it would not fit. The outside diameter was a little too large.
So we set the pinch roller lower and installed the capstan. Reset pinch roller gap to .007 inches.
Tried to read paper tape through unit but it would only move about two inches.
The odd thing is it always stopped at the leading edge of the paper tape holes and the optical sensor with the correct hole pattern in the input register.
After getting the logic repaired we will see if the temporary repair of the capstan is good enough.
Further troubleshooting found three missing cards from the logic chassis.
The first card missing is the driver for bits zero and one of the paper tape punch..
Time ran out so next time will look for spare cards in the warehouse and continue troubleshooting.
Cleaned all the I/O connectors on top of the 1219 computer.
Just about ready for power.
July 25th, Got the proper connectors to connect computer power cable to MG set connectors from eBay.
Nearly read for first power application to Univac 1219.
Still need to install core memory.
Manufacturer photos, software, docs
Computer History Articles Scans and Files
Misc Pictures not specific to one system
Vintage Computing Links
Popular Topics and FAQs
Commodore B Series Tips and Tricks
IMSAI 8080 Project
Prototype PET 2001 photo
Using Toggle Switches to Analyze Memory
Commodore Disk Archive Project
New York Weekly Messenger 2-13-1833
Secrecy is the keystone of all tyranny
Fortran Man - F-Man and Billy BASIC
Northstar Horizon - Boot Problem
Computer History and Restoration Links
IC and chip inventory
S-100 board testing with Z-80 ICE
Donner 3500 - an early portable computer
Univac 1219 rescue
IMSAI 1.4 BASIC vs. MITS 8K BASIC
Fido BBS listing node list 6-13-1986
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
Dell Dimension XPS 466V
Booting the System Using RL02 drive
PACS: Reflections by Kathleen Mauchly
Process Computer Systems, Inc.
Installing Core into PDP 11/40
Slugging it through XXDP Diagnostics
Vintage Computer Festival East 3.0
Commodore B Series Prototypes
VOLSCAN - The first desktop computer with a GUI?
ROBOTS! - Will Robots Take Over?
Magnavox Mystery - a Computer, or?
The 1973 Williams Paddle Ball Arcade Computer Game
The Sperry UNIVAC 1219 Military Computer
VCF East 2007 - PET 30th Anniversary
The Electronic Brain
Community Memory and The People's Computer Company
Charles Babbage's Calculating Machine
Vintage Computing - A 1983 Perspective
Laptops and Portables
From Giant Brains to Hobby Computers - 1957 to 1977
Historic Computer Magazines
World's Smallest Electronic Brain - Simon (1950)
December 2008 - Feb 2009
Free Program Listings
Popular Electronics Jan/Feb 1975 - Altair 8800
Early Microcomputer Mass Storage
gc 200 modular micros label
This image was selected at random from the archive. Click image for more photos and files from this set.