Data are stored within cells of a circular memory array; the number of cells is implementation-defined (8192 in the reference implementation). Each cell is a 16-bit signed integer initialized to 0.
The language retains Brainfuck's commands except for [ and ]. Additionally, the following commands are provided:
; Input at current cell in decimal notation : Output from current cell in decimal notation 0 Set the current cell to 0 * Multiply the current cell by 2 _ Multiply the current cell by -1 # Move n cells to the right where n is the value in the current cell @ Set the current cell to the value of the cell you would reach with a # command $ Set the cell you would reach with a # command to the value of the current cell & Terminate the program S Set the current cell to the sign of the current cell's present value
There is also a single control structure ( | ). If the value of the current cell is nonzero, the commands between ( and | are executed; otherwise, the commands between | and ) are executed. The | is optional, and if it is omitted, the cell being zero will result in none of the parenthesized actions taken place. This structure can also be written with square brackets as [ | ].