How to tell if my quad mem is working

[AndiGer]

Hi,

Quad memory is useful in a HP-41C only and expands the direct addressable memory to 319 registers your CV already has.
The X-functions module contains 124 registers. To expand X-memory you would need a X-memory module - 2 are supported to expand to 600 registers shown in EMDIR if X-memory is empty. Basic requirement is a X-function module in HP-41C and HP-41CV and built-in in the HP-41CX resp.

Andi