Portable programmable calculator displaying absolute line number

Details Portable programmable calculator displaying absolute line number Portable programmable calculator displaying absolute line number

1974-12-16

1977-02-22

Malzahn, David H.

Registers

Transfer mechanism

Traveling pawl

3401725, G06F 1504

Patent

active

040093794

ABSTRACT:
A battery-powered hand-held programmable calculator for performing arithmetic, trigonometric and logarithmic functions and displaying the results thereof is provided with the capability of being fully programmable including branching based on data value. Absolute line number addressing is provided. Program line numbers and the key code associated with an executable step are displayed. The top of the programmable memory is configured as a nonexecutable line corresponding to an automatic stop and all other programmable lines are initially programmed upon start up as being an automatic branch to the top of the memory. Key codes representing a plurality of actuated keys corresponding to a branch instruction are merged to require only one program line in memory.

REFERENCES:
patent: 3588841 (1971-06-01), Ragen
patent: 3594734 (1971-07-01), Wang
patent: 3693162 (1972-09-01), Spangler
patent: 3760171 (1973-09-01), Wang et al.
patent: 3839630 (1974-10-01), Olander et al.

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