CASIO PB110's memory OR-4?

[dmh]

Here's a Casio memory module compatibility table from an old Casio brochure I have.

Note there's a typo where OR-1 and OR-4 are listed as DR-1 and DR-4.

https://www.dropbox.com/scl/fi/t6v2dbiov...0vgrx&dl=0