IAI America DS-S-C1 - Manual (Page 13)

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Command Operand 1 Operand 2
Add 1 1
This command adds 1 to variable register #1. If the register contains 2, then the variable becomes 3.
Add one to variable register #1
(Already contains "2")
Add 1 to variable register #1
Put 1234 into variable register #1
Take 456 out of variable register #1
4.1 What are variables?
The term "variable register" is a software term. Imagine a box that holds numbers. Numbers can be put in and taken out,
added, subtracted, and so on.
Variable
Register #1
Variable
Register #1
2
4. Variables