From GridLAB-D Wiki
Integers requiring 8 bits are stored in an int8 built-in data type. An int8 value can represent values between -128 to 127.
An attempt to store a value outside that range is unpredictable.
GLM
To declare an int8 value in a class use the syntax
class my_class {
int8 my_string;
}
To define an integer value in an object use the syntax
object my_class {
my_integer 123;
}
where "value" is a integer within the range of a 8 bit integer.