US4839794A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pseudo-status signal generator
Assignee: Mitsubishi Electric Corp
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Filing: 1987-11-18
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Granted: 1989-06-13
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Expires: 2007-11-18
Abstract
Abstract An electronic data transfer apparatus comprises a main device connected to input and output data, an input/output requesting device connected to the main device for controlling data input and output operations, a data bus provided between the main device and the input/output requesting device to facilitate connection therebetwen for transferring data, and a pseudo-status signal generator interposed between the main device and the input/output requesting device for alternately generating status signals representing ready and busy states of the main device in accordance with a status request from the input/output requesting device whereby data transfer speed therebetween is substantially improved.
Inventors
- 👤 Makoto Okura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:06
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/14; G06F13/00; G06F13/14
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
98 words
An electronic data transfer apparatus comprising: a main device in which a ready state is always maintained connected to input and output data; an input/output requesting device connected to said main device and controlling data input and output operations; a data bus provided between said main device and said input/output requesting device to establish connection therebetween and transfer data; and a pseudo-status signal generator interposed between said main device and said input/output requesting device and generating status signals representing ready and busy states of said main device in response to a status request from said input/output requesting device.
Claim 2
Dependent Claim
98 words
An electronic data transfer apparatus comprising: a main device in which a ready state is always maintained connected to input and output data; an input/output requesting device connected to said main device and controlling data input and output operations; a data bus provided between said main device and said input/output requesting device to establish connection therebetween and transfer data; and a pseudo-status signal generator interposed between said main device and said input/output requesting device and generating status signals representing ready and busy states of said main device in response to a status request from said input/output requesting device.
Claim 3
Dependent Claim
42 words
A electronic data transfer apparatus according to claim 1 wherein said main device includes a CRT displaying data and a two-port type memory independently transmitting data to be displayed on said CRT and inputting/outputting data to and from said input/output requesting device.
Claim 4
Dependent Claim
38 words
An electronic data transfer apparatus according to claim 2 wherein said CRT is directly connected to one of the two ports of said memory to display data without being disturbed even when read/write operations are simultaneously carried out.
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) | 1992-06-12 | 1992-12-12 | 1993-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-12 | 1996-12-12 | 1997-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-12 | 2000-12-12 | 2001-06-13 | $7700.00 | Window Closed / Lapsed |