HP HP-16C - Page 29

Section 2: The Automatic Memory Stack 27
Keystrokes Display
10101111 10101111
[¢)(LSTx) 1111
1111
11110101 (9 ](LSTx] 1111
101
oo
T
T
T Second number.
Retrieves the constant.
Lower four bits.
Lower four bits.
Using the Stack. Load the stack with a constant by keying it in
and pressing three times. After each operation (here: [AND]),
the stack drops (making the constant available in the Y-register)
and the constant value is regenerated in the T-register. By using
or to disable the stack, the new, variable numbers
entered will “write over” the previous result, thus preserving only
the constant in the stack.
Keystrokes Display
1111 1111
1111
10001001 1001
BSP 0
10101111 [f][(AND] 1111
BSP 0
11110101 [f][AND] 101
The mask (the constant).
Fills the stack with 1111.
Lower four bits of first
number.
Stack lift disabled.
Lower four bits of second
number.
Stack lift disabled.
Lower four bits of third
number.