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, you must 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. While the default value is "0" (off, false, no), this configuration variable can also take values of "On" (true, yes).