If the X register is zero when the B command is given, X is popped from the stack and the base is set to ten. Same as multiplying X by minus one. The only way to enter a negative number is to enter its absolute value and then change its sign. All scientific functions are computed using the full precision currently set by the SM command. The RON and ROF commands can also affect the results of these functions.
X is set to zero.
Y, Z and T are not affected. Also useful in the learned line to display intermediate results. TA-, normally assume the angle involved in either the input or output is expressed in radians. If degrees are desired use the DEG command. This mode stays selected until changed by the RAD command.