Description
for a detailed account of how to use this FACIT model, see:
http://www.tfh-berlin.de/~hamann/facit/f-ca1/index.html

Here are some of the features:
Three red keys labelled I, II and III are for clearing those registers (I = arithmetic; II = counter; III = input) and all three would be pressed at the start of a calculation.
The ADD key adds the entered number to the arithmetic register and clears the input, and the ‘+’ being in the pressed position allows continuous addition.
The main lever-switch at bottom left contols the counting direction and ‘stepping’; the left position is for multiplication and causes stepping from right-to-left, and the right is for division causing stepping from left-to-right.
A red mark to the right of the counter indicates when the number is negative; when the mark is black the number is positive.
The arrow keys step the input to the direction in which they point, and the arrow key with a ball on the end of its symbol jumps the input all the way to the left.

Two basic examples:

Example 1) 123 + 45 - 6 = 162

Press the clear keys I, II and III. Set main switch to middle position and counting direction to positive (black).
Enter the first number (123) into input register (III). Press the ADD key to transfer the input into arithmetic unit (I). The counting unit (II) will now display the figure 1, to indicate this is the first step in the sum. Enter the second number (45) and press the ADD key to add the number. The arithmetic unit displays the inter-
mediate sum (168) and the counting unit displays the figure 2.
Next, enter the third number (6) into input unit and press the ÷ key (together with the SUB-STOP key). The arithmetic unit displays the
result (162) and the counting unit is decreased by 1.

Example 2) 123 x 45 = 5535

Press the clear keys I, II and III. Set main switch to left (multiplication) position and counting direction to positive (black).
Enter the multiplicand (123) into input unit. Press the x key and
the number goes in the hidden memory. Enter the multiplicator (45).
Press = and the multiplication will start automatically. When done,
the multiplicand (123) stays in the input unit, the multiplicator (45)
is in the counter and the result (5535) is in the arithmetic unit.
01/08/2007
Created by: S Davis on 01/08/2007