Electronic calculator

Claim 2

In a calculator, the combination comprising: an arithmetic portion; keyboard means coupled to said arithmetic portion for manually entering data into said arithmetic portion; a nonaddressable storage coupled to said arithmetic portion having more than one register; said storage including means to enter data therein and retrieve data therefrom in a first-in, first-out arrangement; and said keyboard having means for enabling access to said storage to store data therein and to recall such data therefrom as desired.

Claim 3

The calculator according to claim 1 further includinG display means coupled to said arithmetic portion for visually displaying at least results of arithmetic operations.

Claim 4

The calculator according to claim 1 wherein said keyboard means includes interface means to enable the entry of data into said storage from said arithmetic portion.

Claim 5

The calculator according to claim 3 wherein said keyboard means includes interface means to enable the retrieval of data from said storage and entry of said data into said arithmetic portion.

Claim 6

The calculator according to claim 1 wherein said keyboard means includes a first key to enable access to said storage to store data therein and a second key to enable access to said storage to retrieve data therefrom.

Claim 7

The calculator according to claim 5 wherein said first key enables access to said storage to store data therein from said keyboard or said arithmetic portion.

Claim 8

In a calculator as in claim 1, wherein said arithmetic portion includes a memory having a plurality of registers; and said keyboard includes means for enabling the entering of data into said memory in a given sequence and means for enabling the recalling of such data from said memory in a sequence that is reverse to that of the given sequence.

Claim 9

In a calculator as in claim 7, further including an addressable storage coupled to said keyboard and having more than one random access register; and said keyboard including means for enabling the transferring of data from said memory selectively to any of said random access registers and means for enabling the recalling of such transferred data from selective ones of said random access registers.

Claim 10

A calculator comprising: a first memory including means for storing data on a last-in, first-out basis; a second memory including means for storing data on a first-in, first-out basis; storage means for storing data in a random sequence in a multiplicity of registers; and keyboard means coupled to said first and second memories and said storage means for enabling the transferring of data from said first memory to said second memory and said storage means as desired and for recalling such data from second memory and said storage means to said first memory as desired.

Claim 11

A calculator comprising: a first memory including means for storing data on a last-in, first-out basis; a second memory including means for storing data on a first-in, first-out basis; storage means for storing data in a random sequence in a multiplicity of registers; and keyboard means coupled to said first and second memories and said storage means for enabling the transferring of data from said first memory to said second memory and said storage means as desired and for recalling such data from second memory and said storage means to said first memory as desired.

Claim 12

A calculator as in claim 9, including means coupled to at least one of said first and said second memories for performing arithmetic calculations on said stored data.

Claim 13

A calculator as in claim 10 wherein said keyboard includes a plurality of digit keys and store key means for enabling the entering of arithmetic numbers into said first and said second memories and said storage means.

Claim 14

A calculator as in claim 11, wherein said keyboard includes a recall key for enabling the retrieving of data stored in said second memory and said storage means upon depression of said recall key and one of said digit keys.

Claim 15

A calculator comprising: an arithmetic unit; a first group of storage registers including means to store and recall data on a last-in, first-out basis; a second group of storage registers including means to store and recall data on a first-in, first-out basis, coupled to said first group; a third group of storage registers coupled to said first and second groups, individual registers of said third group being selectively addressable for storage and for recall of data in a random sequence; and keyboard means coupled to said arithmetic unit and to said first, second and third groups for enabling the transferring of data between said groups so that stored information may be modified arithmetically by said arithmetic unit and yet retained for further arithmetic modification as desired.

Claim 16

A calculator comprising: an arithmetic unit; a first group of storage registers including means to store and recall data on a last-in, first-out basis; a second group of storage registers including means to store and recall data on a first-in, first-out basis, coupled to said first group; a third group of storage registers coupled to said first and second groups, individual registers of said third group being selectively addressable for storage and for recall of data in a random sequence; and keyboard means coupled to said arithmetic unit and to said first, second and third groups for enabling the transferring of data between said groups so that stored information may be modified arithmetically by said arithmetic unit and yet retained for further arithmetic modification as desired.

Claim 17

A calculator as in claim 13, wherein said first group includes an operating register for the performance of arithmetic functions.

Claim 18

A calculator as in claim 14 wherein said operating register is an entry register for data entered from said keyboard means.