HP 15C Quick Reference Manual page 2

← RUN mode:
PRGM mode: Delete the currently displayed program step
CLEAR ∑ Clear stack and summation registers 0-5
CLEAR PRGM RUN mode:
PRGM mode: Erase entire program memory
CLEAR REG Clear all storage registers
CLEAR PREFIX Clear prefix key and briefly display all 10 digits of the mantissa
CL X RUN mode:
PRGM mode: Store the CLX command as a program command
STO 0-9, .0-.9
STO + 0-9, .0-.9
STO – 0-9, .0-.9
STO x 0-9, .0-.9
STO ÷ 0-9, .0-.9
RCL 0-9, .0-.9
RCL + 0-9, .0-.9
RCL – 0-9, .0-.9
RCL x 0-9, .0-.9
RCL ÷ 0-9, .0-.9
X↔ 0-9, .0-.9
STO I
STO +–x÷ I
RCL I
RCL +–x÷ I
X↔ I
STO (i)
STO +–x÷ (i)
RCL (i)
X↔ (i)
FIX I, SCI I, ENG I
RCL ∑+
LST X
STO A-E
Clearing Data
Deletes either the last digit during number entry or the
entire X-register in case number entry has been
terminated.
Set program counter to 000
Clear X-register
Storage Registers & Indirect Addressing
Store X in the specified storage register.
By default, 20 registers are available
Register store arithmetic: Register OP X → Register.
Recall number from storage register to X-register
Register recall arithmetic: X OP Register → X.
Exchange X with one of the storage registers
Store X in index register
Register store arithmetic with index reister
Recall value from index register
Register recall arithmetic with index reister
Exchange X with index register
Store X in the register pointed to by I.
Values of I and corresponding registers:
0-9 → R0-R9, 10-19 → R.0-R.9, 10 → I
Perform indirect register storage arithmetic
Recall value from the register pointed to by I
Exchange X with the register pointed to by I
Use the index register to specify the number of digits
Recall ∑x and ∑y from the summation registers into X & Y
Recall last value of X-register as it was before the previous operation
Used to enter elements in matrices, see Matrix Operations
HP-15C
2