Some ODBC drivers may assign the TINYINT data type, a signed 1-byte variable that can store values from -128 to 127, to an internal unsigned type that can store values from 0 to 255. To determine if your ODBC driver does this, set a PIC s99 variable to a negative value and then write a record. If a value out of range message is returned, set A_ODBC_UNSIGNED_TINYINT to a nonzero value. As a result, PIC s99 variables are stored in a larger type (usually INT) that allows negative values.
The default value is 0 (OFF, FALSE, or NO). This configuration variable can also take values of ON, TRUE, or YES.