Data General Extended BASIC

Data General's BASIC implementation was used as an inspiration for COMAL-75.

Implementation features

A line can have only one program statement.
The names of variables are expressed as either a single letter or a single letter followed by a digit.
In all subscripting contexts, brackets ([]) may be used in place of parentheses [()].
"ELSE" is not available.
Builtin matrix operations. E.g. MAT MM = ZER sets each value in the matrix MM to zero.
Comma (,) concatenates strings.
Substrings are extracted by subscripting.
Non-printing and special characters may be included in string literals by enclosing the numeric equivalent of the character within angle brackets (< >).
Unless a string variable is declared in a DIM statement, extended BASIC assumes a maximum string length of 10 characters or less.