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.
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!
This blog is property of Edward Shore, 2017.