Radio Shack TRS-80 PC-3 Owner's Manual page 163

Examples
10 DIM 8(10) Sets up an array
20 FOR 1= 1 TO 10
30 READ 8(1) Loads the values from the DATA statement into 8( ) - 8(1) is 1, 8(2) is 2,8(3) is 3, etc.
40 NEXT I
50 DATA 1, 2, 3,4,5,6
60 DATA 7, 8, 9,10