The Formdepth formula might extend over two properties on the TM (Terminal Model Maintenance) screen. These two properties represent two records in the CODES file. The percent character (%) at the end of the first property indicates continuation in the second property. Processing continues at the start of the second record. (Do not leave extra space characters before the % character.)

Lowercase characters might be used for the B, H, N, and W parameters, but not elsewhere. For example, uppercase A through F must be used in hexadecimal pairs.

Hexadecimal values must be given in full, as pairs. Odd numbers of digits (without a pair) are ignored.

Invalid hexadecimal digits (not 0 through 9, nor A through F) cause processing to terminate.

Invalid characters in calculation mode cause scanning to recommence from the right parenthesis character.

More than one arithmetic operation is allowed, and the operations are cumulative. For example, +1*4 means:

 (Formdepth + 1) * 4

A space character terminates the formula.