T E C H N I C A L   D A T A   of  the  Mechanical Printing-Calculator
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                                                                10/11
Model:               OLIVETTI SUMMA PRIMA 20

Serial Number:       550027

Dimensions:   (ca.)  Width   =   9 " /  23 cm
                     Depth   =  14 " /  36 cm
                     Height  =   5 " /  13 cm

Weight:       (ca.)  9_1/4 lbs  /  4.2 kg

Mechanics:           Serial-to-parallel Conversion,
                     10-Block-Keyboard

                     Black/RED Nylon Ribbon (= Typewriter):
                     1/2" * 16'  /  13 mm * 5 m
                     ( Spool-Diameter = 1_1/2"  /  40 mm )
                     Paper Roll (Standard):
                     2_1/4" * 2_3/4" * 165'  (W * D * L)
                     57 mm  * 65 mm  * 50 m  (B * D * L)

Functions:           Add, Subtract,
                     NonAdd, Repeat, Subtotal, Total

Registers:           Input       =   10 Decimals
                     Arithmetic  =   11 Decimals
                     Printing    =   12 Characters
Manufacturer:
                     OLIVETTI & C., S.p.A.
                     Ivrea / Italy
                     1970

HOW TO USE  the  OLIVETTI  » SUMMA PRIMA 20 «
*********************************************

ENTER A NUMBER:
---------------
The actual number of digits entered shows on the window beside the
keyboard. If wrong digits are entered, push the black spherical lever
to clear the keyboard.

ADDITION:
---------
Everytime a number is entered and the handle is pulled, the number
is printed and added to memory.

REPEAT:
-------
To enter the same number more than once, push the switch [X] before
pulling the handle. The keyboard will not be cleared after releasing
the handle. To release [X]: Pull the switch before the next cycle.

SUBTRACTION:
------------
Enter the number; set the "joystick" to [-] before pulling the handle.
Entering more negative numbers, push the right lever down to lock [-].

NON-ADD:
--------
Enter the item number; set the "joystick" to [<] before pulling the
handle. This item number is printed, but it is not part of the
addition/subtraction cycle. 

SUBTOTAL ( printed in RED ):
----------------------------
The cumulated sum will be printed when the "joystick" is set to [◊]
before pulling the handle. The memory will hold the actual sum.

TOTAL ( printed in RED ):
-------------------------
The total sum will be printed when the "joystick" is set to [*] before
pulling the handle. Memory will be cleared after releasing the handle.

CHANGING THE PAPER ROLL:
************************
( no problems )

CHANGING THE RIBBON:
********************
( no problems )

PRINTOUT - Example                        with Comments:
********************************************************
[* =Total] & [◊ =Subtotal]  L I N E S  printed in  R E D

^^^^^^^^^^^^^^^^^^^^|   To clear memory:
|                *  |   Set [* =Total], Pull handle 
|                   |                       Paper feed knob turned...
|                   |
|                   |                      < Max.Input = 10 decimals >
|  98.765.432,10    |   Enter (1st) number, Pull handle
|  87.654.321,09    |   Enter (2nd) number, Pull handle
| 186.419.753,19 ◊  |   Set [◊ =Subtotal] to print sum, Pull handle
|                   |                       Paper feed knob turned        
|           1,23  - |   Enter (neg.) number, Set [-], Pull handle
| 186.419.751,96 ◊  |   Set [◊] to print cumulated sum, Pull handle
|                   |                       Paper feed knob turned
|           4,56    |   Set [X =Repeat], Enter number, Pull handle
|           4,56    |   Release [X], Pull handle
| 186.419.761,08 *  |   Set [*] to print total sum, Pull handle
|                   |                     < Max.Output = 11 decimals >
|                   |
|                   |                    ...Paper feed knob turned
|                *  |   Memory is clear
|                   |                       Paper feed knob turned...
|                   |
|             13 <  |   Enter item #13, Set [< =NonAdd], Pull handle
|         123,00    |   Enter price, Pull handle
|             47 <  |   Enter item #47, Set [<], Pull handle
|         456,00    |   Enter price, Pull handle
|             11 <  |   Enter item #11, Set [<], Pull handle
|         789,00    |   Enter price, Pull handle
|       1.368.00 *  |   Set [*] to print total price, Pull handle
|                   |
|                   |                    ...Paper feed knob turned
|                *  |   Memory is clear
|                   |                       Paper feed knob turned
|             12    |   Enter number
|             24  - |   Enter (larger negative) number
|             12 *- |   Negative sum
|                   |
^^^^^^^^^^^^^^^^^^^^^

R E M A R K S :                 HOW TO OPEN THE COVER FOR MAINTENANCES ...
==========================================================================
(1)  Remove paper roll by shifting the left holder to the left
(2)  Pull the paper out
(3)  Looking down, there is a SHIFT LEVER: UNLOCK by shifting it RIGHT
(4)  OPEN the RIBBON LID !
(5)  PULL the COVER from its BACK SIDE and SHIFT it to the FRONT
(6)  REMOVE the COVER
(7)  PULL the CHASSIS out of its RUBBER HOLDERS
(8)  Now there is ACCESS from all sides ...

                     Other OLIVETTI / UNDERWOOD Adding Machines ...
                     Have a look at "Calculating Trickies" ...
impressum:
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© C.HAMANN           http://public.BHT-Berlin.de/hamann           06/23/10