Subtracts one hexadecimal number from another.
TCL-I command.
SUBX m s
m is a hexadecimal number (minuend).
s is a hexadecimal number (subtrahend).
Hexadecimal numbers are considered negative when in the range from
X'FFFFFFFFFFFF' (-1) to X'800000000001'
Example
:SUBX FF AE
51