Data storage apparatus having volatile memory and nonvolatile me

Details Data storage apparatus having volatile memory and nonvolatile me Data storage apparatus having volatile memory and nonvolatile me

1991-11-21

1995-08-01

Bowler, Alyssa H.

Boots, shoes, and leggings

3642295, 3642311, 3642313, 3642315, 3642384, 3642386, 36424233, 36424344, 364243, 3642437, 3642452, 364246, 36424611, 3642465, 364DIG1, 364DIG2, G06F 924, G06F 9445, G06F 1206, G06F 1214

Patent

active

054386799

ABSTRACT:
Data input from a key switch is displayed on a liquid crystal display, and whether to store the data in a RAM or an EEPROM is selected by a selection switch. If the EEPROM is selected, a CPU turns on a power switch to apply a high voltage to the EEPROM to write the input data therein. Data stored in the RAM and the EEPROM are read out upon operation of a search switch and are sequentially displayed on the liquid crystal display. It is clearly indicated on the display whether the currently displayed data is read out from the RAM or the EEPROM. With this operation, if data which is required to be protected against disconnection of a power supply voltage or a drop in power supply voltage is stored in the RAM, the data can be stored in the EEPROM.

REFERENCES:
patent: 4493043 (1985-01-01), Forbath
patent: 4564922 (1986-01-01), Muller
patent: 4652139 (1987-03-01), Sulcer, Jr.
patent: 4712923 (1987-12-01), Martin
patent: 4874935 (1989-10-01), Younger
patent: 4907795 (1990-03-01), Shaw et al.
patent: 5181231 (1993-01-01), Parikh et al.
patent: 5231592 (1993-07-01), Itoh
Patent Abstracts of Japan, vol. 8, No. 10 (P-248)(1447) Jan. 18, 1984 & JP-A-58 169 395 (Fujitsu) Oct. 5, 1983.
Patent Abstracts of Japan, vol. 14, No. 382 Aug. 17, 1990 & JP-A-21 40 151 (Toshiba).

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