Just write your code so it doesn't trash your position counter ! You must be initialising it to zero or something, because a '52 DOES NO ram tests itself.

Only your code to add data to the RAM needs to change your position counter.

A "linked list" kind-of-thing is probably the simplest method of storing stuff, in an efficient format, with few gaps.

You can always absolutely locate things with Aseg and ORG as well.

Steve