Accu 1 is substracted of accu 2 and the result is stored in accu 1. Accu 2 stays unchanged. If the result is smaller than -32768 the OV-bit will be set.
L 2000
L MW 12
-I
T MW 14 // in MW 14 is now displayed 2000 - MW 12
See also:
EN-input and ENO-output