TI-15:
Memory and Hidden Memory Arithmetic
Many thanks to
Bob Patton, a fellow HP calculator enthusiast, who sent me this
information. One of the door prizes I
won from HHC 2016 was a TI-15 calculator which Patton donated. (I also previously purchased an HP 32
SII).
A link to my
previous retro review (October 2016): http://edspi31415.blogspot.com/2016/10/review-texas-instruments-ti-15.html
Storing Numbers in Memory:
A Unique Way
I don’t think I
ever seen this storage sequence like the one that is presented in the
TI-15. Almost all calculators have a
sequence as such: ([2nd/Shift])
[ STO ] ([register/variable]). However
to store numbers in memory on the TI-15, the sequence is [ = ] [ >M ] [ = ].
For example, to
store 100 in memory, I would press 100 [ = ] [ >M ] [ = ].
To recall
numbers from memory, press [MR/MC]. If
this key is pressed twice, the memory is cleared.
Hidden Talent: Memory
Arithmetic
Patton sent me
the information of this neat undocumented feature of memory arithmetic. The following sequences are:
[ = ] [ M> ]
[ + ]: Add number to memory M
[ = ] [ M> ]
[ - ]: Subtracts number from memory M
[ = ] [ M> ]
[ * ]: Multiplies number to memory M
[ = ] [ M> ]
[ ÷ ]: Division, M ÷ number
[ = ] [ M> ]
[ Int÷ ]: Integer Division, int(M ÷ number)
Press [MR/MC]
to recall the result.
Example
Store 100 to
memory:
100 [ = ] [
>M ] [ = ]
Add 10 to
M. (Result: 110)
10 [ = ] [
>M ] [ + ]
Subtract 10
from M. (Result: 100)
10 [ = ] [
>M ] [ - ]
Multiply 10 to
M. (Result: 1,000)
10 [ = ] [
>M ] [ * ]
Divide
M/10. (Result: 100)
10 [ = ] [ >M
] [ ÷ ]
Integer Division. Int(M/6) (Result: 16)
6 [ = ] [ >M
] [ Int÷ ]
Special thanks
to Bob Hutton!
Eddie
This blog is
property of Edward Shore, 2017.
