JPS5746394A - Data rom mounting method - Google Patents
Data rom mounting methodInfo
- Publication number
- JPS5746394A JPS5746394A JP12239780A JP12239780A JPS5746394A JP S5746394 A JPS5746394 A JP S5746394A JP 12239780 A JP12239780 A JP 12239780A JP 12239780 A JP12239780 A JP 12239780A JP S5746394 A JPS5746394 A JP S5746394A
- Authority
- JP
- Japan
- Prior art keywords
- turned
- rom1
- spare
- rom2
- power supply
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C17/00—Read-only memories programmable only once; Semi-permanent stores, e.g. manually-replaceable information cards
Landscapes
- Read Only Memory (AREA)
- For Increasing The Reliability Of Semiconductor Memories (AREA)
Abstract
PURPOSE:To facilitate an easy exchange of an ROM, by providing a pair of spare and using ROM sockets storing the station data to a front panel, and a changeover switch and a switching circuit. CONSTITUTION:In case a change is given to the station data, etc. and the contents of a using ROM1 has to be changed, a spare ROM2 is mounted on a front panel 14. Then a switch SW is turned toward the spare side, and accordingly NAND gates 7 and 8 open to set a filip-flop 9. As a result, a transistor (TR)13 is turned on to apply the power supply to the ROM2. On the contrary, a TR12 is turned off to break the power supply of the ROM1. Furthermore tri-state buffers 5 and 6 are turned on; while tri-state buffers 3 and 4 are turned off. Thus the separation of the ROM1 is made possible.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12239780A JPS5746394A (en) | 1980-09-05 | 1980-09-05 | Data rom mounting method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12239780A JPS5746394A (en) | 1980-09-05 | 1980-09-05 | Data rom mounting method |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5746394A true JPS5746394A (en) | 1982-03-16 |
Family
ID=14834775
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12239780A Pending JPS5746394A (en) | 1980-09-05 | 1980-09-05 | Data rom mounting method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5746394A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7020301B2 (en) | 2001-11-05 | 2006-03-28 | Matsushita Electric Industrial Co., Ltd. | Loudspeaker |
JP2008118218A (en) * | 2006-10-31 | 2008-05-22 | Sanyo Electric Co Ltd | Electroacoustic transducer |
JP2008118217A (en) * | 2006-10-31 | 2008-05-22 | Sanyo Electric Co Ltd | Electroacoustic transducer |
-
1980
- 1980-09-05 JP JP12239780A patent/JPS5746394A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7020301B2 (en) | 2001-11-05 | 2006-03-28 | Matsushita Electric Industrial Co., Ltd. | Loudspeaker |
JP2008118218A (en) * | 2006-10-31 | 2008-05-22 | Sanyo Electric Co Ltd | Electroacoustic transducer |
JP2008118217A (en) * | 2006-10-31 | 2008-05-22 | Sanyo Electric Co Ltd | Electroacoustic transducer |
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