These are buttons M+, MS, MR, MC, & 2nd.  These buttons are used to manipulate the two memory banks.  Memory is stored in .ini file and is remembered even after exiting program.  Select these buttons by clicking on them.


M+

Memory Add.  Adds calculation window contents to current memory.


MS

Memory Set.  Replaces current memory contents with calculation window contents.


MR

Memory Recall.  Puts current memory contents into calculation window.


MC

Memory Clear.  Clears current memory contents.


2nd

Toggles between memory bank 1 and 2.