HP 81110A Quick Start Manual page 59

NOTE:
HP 81110/04A Quick Start
the HP 81110A or HP 81104A support only DOS formatted
memory-cards and you cannot create or delete directories using
the HP 81110A or HP 81104A.
The HP 81110A and HP 81104A support memory cards up to
2 MB, SRAM Type.
The filenames can be up to 8 characters long.
Introduction
Reading/Storing on Memory Card
Introduction
61