Atari XL Handbook page 36

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The A tar; XL Handbook
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Here again the array can be thought of as a
collection of storage boxes, this time laid out in a
grid as shown in the table below. The two columns
could represent for example the number of iterns in
stock, and the price of each item.
B
=
0
B = 1
A=O
34 3.7
A = 1
7
6.85
A=2 302
0.35
The Array TABLE
You can use arrays with one or two dimensions, but
no more. The maximum allowed value of each
reference number may be anything up to several
thousand, but this depends on how much memory is
occupied by the program itself, and by the other
variables of the program.
A DIM command must be included at the
beginning of any program which will use arrays.
The command tells the computer to reserve
memory space for the array. If you try to use an
array without setting its dimensions the Atari will
give the error message 9'.
GETTING VALUES INTO PROGRAMS
It would be very inconvenient to have to alter a
program to make it handle different numbers, so
there are a number of instructions which allow