|The mystery is solved.|
Message #10 Posted by Michael de Estrada on 28 Mar 2011, 7:46 p.m.,
in response to message #6 by db(martinez,ca)
My Commodore SR4921 RPN arrived today and I observed that it indeed can store and recall numbers in registers 0 though 9, and in fact can also perform memory arithmetic such as M+ and Mx. But, wait, it is all an illusion, since in fact there are only 3 real independent storage memories and the values in memories 0 through 2 are replicated in the other phantom registers. Registers 0,4,8 are the same storage location, 1,3,5,7,9 are the same and 2,6 are the same. Store a number or perform storage arithemetic on any one of them, and the result will be replicated in the others. Use the statistical functions, and values will be stored in all of them, not just the first three. So basically, the other number keys have been mapped to the same memory locations, instead of giving an error indication as would be the case with most other caculators when attempting such an illegal operation.