Elektronika MK-61 Calculator Operating Instructions
18
Draft version 1.0 – Oct.2014
Please send corrections to Jose Mesquita ([email protected])
7.12. The four stack registers and the previous X value in register X1 facilitate complex
calculations
8
.
7.13. To store the register X contents into one of the additional 15 memory registers,
use the key
STO
(
Х→П
) and choose the destination register number with one of
the keys
to
and
to
.
To load register X with a number from a memory register contents, press key
RCL
(
П→Х
) followed by one of the source register numbers.
7.14. To clear a memory register by writing zero into it, use the key
CX
followed
by the key
STO
(
Х→П
) and choose the destination register address number.
To clear all MK memory registers, simply turn off the calculator
9
.
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MK-61 RPN stack manipulation details are beyond the scope here, but let’s see a couple of examples.
The stack Register X is linked to the Display, so its content is always visible. When typing a number, it is
being entered into Register X. There is no need to do an ENTER to execute single number operations.
On the above example, when executing Sin(45), it first copies reg. X contents into Reg. X1, then
calculates the Sin(45) function, and the result is put back into Reg. X.
If we retrieve the previous Reg. X value, it will invoke an automatic stack lift up (X goes into Y, Y into Z, Z
into T, and previous T content is lost), to free up Reg. X to receive the LST x operator result.
On the next example, we pushed 3 numbers into the Y, Z, T stack registers, leaving X=Y. A Multiply
consumes X and Y as operands, leaving the answer in X. During the execution, an automatic stack lift
down was executed (T goes into Z, Z goes into Y) leaving T and Z with identical contents.
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After switching off the calculator, please allow at least 30 seconds before turning it back on.
See Chapter 1. Notice to Owners.