If n is greater than zero, reserve n address units of data space. If n is less than zero, release | n | address units of data space. If n is zero, leave the data-space pointer unchanged.

If the data-space pointer is aligned and n is a multiple of the size of a cell when ALLOT begins execution, it will remain aligned when ALLOT finishes execution.

If the data-space pointer is character aligned and n is a multiple of the size of a character when ALLOT begins execution, it will remain character aligned when ALLOT finishes execution.