This switch affects the operation of PRINT.SBR and leading form feeds. In the default case, PRINT.SBR would put a leading form feed character at the top of the file. Under AMOS, this would generally not result in an extra blank page, due to a peculiarity of the AMOS spooler. However, under most other platforms, it probably would cause an extra leading blank page. To eliminate those, set SBR=PRINTNOFF.