Apparatus and method for indicating when it is safe and unsafe t

Details Apparatus and method for indicating when it is safe and unsafe t Apparatus and method for indicating when it is safe and unsafe t

1989-05-22

1990-07-10

Orsino, Joseph A.

Communications: electrical

Condition responsive indicating system

Specific condition

340635, 365 52, G08B 2100

Patent

active

049409697

ABSTRACT:
An apparatus and method are provided for indicating when it is safe and unsafe to insert a memory cartridge into and remove a memory cartridge from a cartridge receiving device. In one embodiment, the cartridge receiving device includes at least one buffer for buffering information signals to be supplied to the memory cartridge althrough such buffer need not necessarily be located within said cartridge receiving device. The apparatus includes an indicator which is caused to assume a first state to indicate to a user that it is unsafe to insert the memory cartridge into or remove the memory cartridge from the receiving device when at least one of the two following conditions occurs: (1) an attempt is being made to write data to or read data from the memory cartridge, (2) at least one buffer is enabled at the same time the memory cartridge is not present in the receiving device.

REFERENCES:
patent: 4245331 (1981-01-01), Hamaro et al.
patent: 4730156 (1988-03-01), Matsuda
patent: 4785363 (1988-11-01), Jacobs et al.

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