Computerized data terminal with switchable memory address for st

Details Computerized data terminal with switchable memory address for st Computerized data terminal with switchable memory address for st

1992-11-25

1996-01-23

Robertson, David L.

39542101, 395700, G06F 1202

Patent

active

054871611

ABSTRACT:
A microprocessor circuit of a computerized data collection terminal includes the microprocessor and reprogrammable flash read only memory at memory address locations from which normally start-up and control instructions would be retrieved. A connector port is coupled to the microprocessor circuit through which additional memory, for example in the form of a memory card, may be temporarily and removably coupled into the circuit. A special purpose memory card includes start-up and control instructions to start and operate the microprocessor. The data collection terminal includes a special switch which, when activated, causes the rerouting of start-up code requests by the microprocessor from the memory locations of the reprogrammable flash memory to locations on the special purpose memory card. The special purpose memory card also contains program instructions for copying the microprocessor start-up and system control instructions from the special purpose memory card to the memory locations of the reprogrammable flash memory of the microprocessor circuit of the terminal. Switching the address of start-up and control code from the internal memory locations to the externally supplied memory locations allows the data collection terminal to be manufactured and assembled and to be programmed for a specific purpose after assembly.

REFERENCES:
patent: 4523297 (1985-06-01), Ugon et al.
patent: 4626986 (1986-12-01), Mori
patent: 5227614 (1993-07-01), Danielson et al.
patent: 5307505 (1994-04-01), Houlberg et al.

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