Varian Data 620/i System Reference Manual page 116

The range of numbers in the DATA 620/i is from _2 15 to +215 -1 for the 16-bit
configuration and -217 to+2 17 -1 for the 18-bitconfiguration. The zero minus 1 and
plus/minus full-scale numbers for the 16-bit configuration are:
Binary Octal Decimal
0111111111111111
0777778
+32,767
+Full Scale
0000000000000000
000000 0
0
1111111111111111
1777778
-1 -1
1000000000000000 100000
8
-32,768 -Full Scale
The negative of the octal equiva lent number is found by subtracting the number from
1777778 and adding 1 in the least-significant digit (subtract from 7777778 for the
l8-bit configuration). Example:
1777778
-(9) -000011
8
+1
(-9) 177767
8
In performing addition or subtraction, it is possible for the results to exceed the ± full
scale range of the machine. For example:
Decimal
Octal
+21,980 052734
8
+ 11,843 +027103
8
33,823 102037
8
-31,713
A-2