When TECO32 v40.36 (distributed with VAX/VMS v5.3) is run from batch, and a "0,256et" command is executed to turn off line wrapping on the terminal, TECO dies with "Reserved operand fault". The following patch fixes the bug. $ set def sys$common:[syslib] $ patch tecoshr.exe rep/i 7150 'tstw l^83e' 'beql 71d6' exit 'movl #1, r0' exit update exit $ install replace sys$share:tecoshr.exe Thanks to Rick Murphy at DEC.