If you select device bigger than S4 physical size then use the following for the LOAD, COMP, BURN, TEST. Example:
- >LOAD 27C080
- 00000-7FFFF#00000
Note that # indicates that S4 URAM is less than device size. Now, move cursor to the first digit after # and press red UP or down. The first digit changes to 8 - meaning 80000.