the address of ptr 1 so as to point to the next addressable storage location in table 1 the central processor now returns via common junction 34 e 34 to step 518 and awaits the next keyboard entry it is also to be noted that the central processor will directly return to step 518 from step 544 in the event that ptr 1 is at the last addressable storage location referring again to step 540 in the event that the software reference pal does not equal one the central processor will proceed along a no path to a step 548 step 548 asks whether the software reference pal is equal to two this will be the case if a pallet code of two has been sensed in step 414 in the event that pal is equal to two the central processor will proceed to step 550 and store the contents 34 m 34 of the software reference patn in the storage location currently pointed to by ptr 2 the central processor will then proceed through steps 552 and 554 and increment the software reference ptr 2 if the same is not already pointing to the last addressable storage location of table 2 having this updated the status of ptr 2 the central processor will proceed via common return junction 34 e 34 to step 518 and await the next keyboard entry referring again to step 548 in the event that the software reference pal does not equal two the central processor will proceed to a step 556 on the basis that the pallet code stored in.