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US4617650A
Expired / Lapsed
US
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Memory module for a programmable electronic device
Assignee: Sharp Corp
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Filing: 1983-08-01
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Granted: 1986-10-14
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Expires: 2003-08-01
Abstract
Abstract A memory module is provided for read/writing a program. The memory module is connected to a programmable device including a programmable electronic calculator, a personal computer, a computer, or a word processing device such as a word processor and a language dictionary. A switch is provided for selectively supplying read/write control signals to the memory module. The memory module includes a plurality of memory areas which may be selectively disconnected from the read/write control signals to prevent reading/writing therein.
Inventors
- 👤 Masuaki Morino
- 👤 Yuji Takada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:44
CPC Classifications
G; G06; G06F; G06F15/00; G06F15/02; G06F40/00; G06F40/20; G06F40/237; G06F40/242; G11; G11C; G11C7/00; G11C7/22
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
115 words
A memory module connectable to a programmable electronic device comprising: input means for introducing information into said device; means for developing a write command; memory means, responsive to the write command developed by said means for developing, for storing said information introduced by said input means therein, said memory means including a plurality of independently addressable read/write memory areas; inhibit means, disposed between said means for developing and said memory means, for inhibiting the application of said write command to selected ones of said plurality of independently addressable read/write memory areas, which form less than all of said plurality of memory areas to thereby prevent undesired damage to the contents of these inhibited memory areas.
Claim 2
Dependent Claim
115 words
A memory module connectable to a programmable electronic device comprising: input means for introducing information into said device; means for developing a write command; memory means, responsive to the write command developed by said means for developing, for storing said information introduced by said input means therein, said memory means including a plurality of independently addressable read/write memory areas; inhibit means, disposed between said means for developing and said memory means, for inhibiting the application of said write command to selected ones of said plurality of independently addressable read/write memory areas, which form less than all of said plurality of memory areas to thereby prevent undesired damage to the contents of these inhibited memory areas.
Claim 3
Dependent Claim
31 words
The module of claim 1 wherein said inhibit means comprises at least one switch connected between a said independently addressable read/write memory area and said area for developing a write command.
Claim 4
Dependent Claim
41 words
The module of claim 1 wherein said memory means comprises random access memory means and wherein said programmable electronic device is selected from the group consisting of a programmable electronic calculator, a computer, a word processing device, and a language dictionary.
Claim 5
Dependent Claim
22 words
The module of claim 1 further comprising: means for inhibiting the listing of a selected program stored in said inhibited memory areas.
Claim 6
Dependent Claim
31 words
The module of claim 1 wherein the inhibiting of the application of said write command to said selected ones of said plurality of independently addressable read/write memory areas is operator selectable.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-10-13 | 1990-04-14 | 1990-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-13 | 1994-04-14 | 1994-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-13 | 1998-04-14 | 1998-10-14 | $7700.00 | Window Closed / Lapsed |