These 2 described machines are
the 2 first french computers made with transistors, designed by french
on the french territory. (as explained by my old colleagues in 1969/70)
They have been built in less then 10 exemplaries...
I stocked these 2 machines during 37 years and begin to analyze them!
The small one was built in 1962, and the big one probably before...
Unfortunatly i have no drawings of these machines. If you have
information about them, do not hesitate to contact me (at
email@example.com without the 1234 number: ie pichotjm@free...)
If you read french, i have 5 notices explaining the hardware and
These computers are unique survivors of
the second generation of computers. All brothers have been destroyed...
[First generation with valves,
2nd with transistors,
with small IC (ex '74 series or ECL) and
4th with uP...]
You can come and discuss on the following forum: http://pichotjm.free.fr/php/index.php?
Every people in computer science read/write english. Use simple
I have finished to restore the small
machine... what a hard work! (Today, the work is done at 100%).
You can read many information following this link ODP-505 restoring
You will find these
and a high amount of photographies. I hove you will
enjoy the work I have done.
We just transport the big computer
(september 8, 2007). We were 6 men and without any elevator!
task was huge and difficult. It's very heavy! To minimize the weight,
my 3rd son and I
have extracted some racks with many difficuties.
Big use of antirust liquid (during several months),
and some foot
kik to unlock racks...
Notice precises 'dust proof machine'. I can assure you that after
47 years dust is here! and rust too!
(balls of extractive
We were not able to stand up the computer: too heavy, too tired,
It was dangerous to move it out of the truck. Gods
were in a good day.
Coloss stands now on the ground, and this will
give me the ability to acces to some parts of the machine.
not able to put the machine in a special prepared room (with less
humidity): too big!
Voilà, i can now start restoring the machine... but a huge task is
The cpu machine is bigger than the ODP-505
machine. Lot of power supplies, with sequencing logic.
too, data logging system (ADC), interfaces to outside (keyboard
system), to Friden machine (kind of Teletype?) and so on, i have to
discover this world...
I need courage to begin.
I will publish, following months, the
restoring state... this will probably need several years!
OA-1001 restoring state
url to be
written! (The machine is restored to 0%).
I would like to thanks my 3 sons
Nicolas, Renaud, Quentin, my wife Anne and my brother Michel,
for helping me to transport the machine. They have made about 750 km
(500 miles) to help me (each).
My 4th son, Philippe, was in USA, but he will help all of us to stand
up the machine at Xmas 2007!
Fortunatly, i have saved 5 marvellous
notices concerning these 2 machines. (but sorry, most in french)
is interesting to have a look, just to see OP code / Op description,
schematics or block diagrams.
If you know assembler, you will find
information and have ideas.
If you know hardware, you will
understand some schematics.
Descriptive notices of the machines
OA-1001 Design and hardware
This document deeply describes the
hardware operation of the computer (germanium cpu,
powers and interfaces).
Description goes to bit level, and give information about priority
system, bus operation,
accumulator and registers. (fabulous! but sorry, in french.)
notice (text mode)
Design and hardware description
notice (thumbnails mode)
Design and hardware description
Waiting 2 bunches of cards drying... I
prepared this chapter on Ferrite core memories. (Today, only pictures)
This is very impressive to discover. Note the dimensions of the card
comparing it with the hand.
I take pictures with different lights.
Note the color of wires. You can see too, some missing or destroyed
cores... and a lot of dust!
I was afraid to destroy the card during
Restoring of a 13 bit ADC converter
(Analog to digital converter):
I lasted my week in restoring this
very old converter 
Just for training me, because it is a
rack... I published, on line, many photos describing
of the restoration. Many do not have any merit to be published
interest, they are very similar). It will be able, in the futur, to
We can see that cleaning and preserving processes
lead to loss 5 transistors.
This rack seems to be incomplete,
because i think it must have 58 cards!
I have another converter,
quite similar, but with lacking cards. It will be restored ...another
month... Have a look in OA-1001 restoration project.
ADC rack restoration
the rack is restored).
Photos at discovery and
concerning the heath of machines, how to clean them, some details of
on 2007-03-29 Created by hand!
(rev 2007-09-14, hardware notice, OA-1001
2009-01-13 Transistor specs
If somebody wants to
correct my poor english, feel free...
Note : All pictures of
this site are copyrighted.
You don't have to use it without my
depuis le 28jan2008