GoSubIfZ LLLL

Tests the contents of X, Popping the register stack in the process, then executes a GoSub to the program line LLLL if X was zero.

This instruction has the alias (alternative name) GoSubIfF

Dialect restriction: This instruction is not implemented on boards prior to dialect D=3.

See also Return, RetIfZ, RetIfNZ, RetIfT, RetIfF, Gosub, GoSubIfNZ, GoSubIfT, GoSubIfF

Do not confuse with GoIfZ, which does not remember a line to return to.