Method and circuit arrangement for protection of typewriters or

Details Method and circuit arrangement for protection of typewriters or Method and circuit arrangement for protection of typewriters or

1988-12-02

1989-07-04

Chan, Eddie P.

Typewriting machines

Safety switch or condition-responsive-cutoff switch for...

364900, 364936, G06F 1100

Patent

active

048446300

ABSTRACT:
In a typewriter having a microprocessor for processing stored data according to a stored program, a method for detecting that a machine cover has been opened for servicing and for interrupting a data processing cycle in progress for as long as the cover remains open, said method including, in response to said interruption, the steps of storing in a portion of memory all data, addresses and flags required for the later continuation of the control cycle so that the programmable control unit can subsequently be brought into a condition in which it is insensitive to a great extent to the consequences of electrostatic discharges as may occur during servicing, and after closure of said machine cover after servicing, reconstructing the status of the control cycle prior to the termination, by entering the data, addresses and flags stored in memory into appropriate working registers and buffers.

REFERENCES:
patent: 4327410 (1982-04-01), Patel et al.
patent: 4618953 (1986-10-01), Daniels et al.
patent: 4759648 (1988-07-01), Kobayashi et al.

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