Information about Regenerative Capacitor Memory
Regenerative capacitor memory is a type of computer memory that uses the electrical property of capacitance to store the bits of data. Because the stored charge slowly leaks away, these memories must be periodically regenerated (i.e. read and rewritten, also called refreshed) to prevent data loss.
Other types of computer memory exist that use the electrical property of capacitance to store the data, but do not require regeneration. However these have either been somewhat impractical (e.g., the Selectron tube) or are usually considered to be read-only memory (e.g., EPROM, Flash memory) because writing takes significantly longer than reading them.
The first random access regenerative capacitor memory was the Williams tube (1947). Typically they stored ½K to 1K bits, the refresh rate required varied depending on the type of CRT used.
The modern DRAM (1966) is a regenerative capacitor memory.
Read-only memory (usually known by its acronym, ROM) is a class of storage media used in computers and other electronic devices.
..... Click the link for more information.
Other types of computer memory exist that use the electrical property of capacitance to store the data, but do not require regeneration. However these have either been somewhat impractical (e.g., the Selectron tube) or are usually considered to be read-only memory (e.g., EPROM, Flash memory) because writing takes significantly longer than reading them.
History
The first regenerative capacitor memory built was the rotating capacitor drum memory of the Atanasoff–Berry Computer (1942). It stored 30 – 50 bit binary numbers, rotated at 60 rpm and was regenerated every rotation (1 Hz refresh rate).The first random access regenerative capacitor memory was the Williams tube (1947). Typically they stored ½K to 1K bits, the refresh rate required varied depending on the type of CRT used.
The modern DRAM (1966) is a regenerative capacitor memory.
Capacitance is a measure of the amount of electric charge stored (or separated) for a given electric potential. The most common form of charge storage device is a two-plate capacitor.
..... Click the link for more information.
..... Click the link for more information.
BIT is an acronym for:
..... Click the link for more information.
- Bannari amman Institute of Technology
- Bangalore Institute of Technology
- Beijing Institute of Technology
- Benzisothiazolinone
- Bilateral Investment Treaty
- Bhilai Institute of Technology - Durg
..... Click the link for more information.
Memory refresh is the process of periodically reading information from an area of computer memory, and immediately rewriting the read information to the same area with no modifications. Each memory refresh cycle refreshes a succeeding area of memory.
..... Click the link for more information.
..... Click the link for more information.
The Selectron was an early form of digital computer memory developed by Jan A. Rajchman and his group at the Radio Corporation of America under the direction of Vladimir Zworykin, of television technology fame.
..... Click the link for more information.
..... Click the link for more information.
- The notion of read-only data can also refer to file system permissions.
Read-only memory (usually known by its acronym, ROM) is a class of storage media used in computers and other electronic devices.
..... Click the link for more information.
EPROM, or erasable programmable read-only memory, is a type of computer memory chip that retains its data when its power supply is switched off. In other words, it is non-volatile.
..... Click the link for more information.
..... Click the link for more information.
Flash memory is non-volatile computer memory that can be electrically erased and reprogrammed. It is a technology that is primarily used in memory cards, and USB flash drives (thumb drives, handy drive, memory stick, flash stick, jump drive) for general storage and transfer of data
..... Click the link for more information.
..... Click the link for more information.
random access is the ability to access an arbitrary element of a sequence in equal time. The opposite is sequential access, where a remote element takes longer time to access.
..... Click the link for more information.
..... Click the link for more information.
The Williams tube or (more accurately) the Williams-Kilburn tube (after Freddie Williams and co-worker Tom Kilburn), developed about 1946 or 1947, was a cathode ray tube used to electronically store binary data.
..... Click the link for more information.
..... Click the link for more information.
1. Electron guns 2. Electron beams 3. Focusing coils 4. Deflection coils 5. Anode connection 6. Mask for separating beams for red, green, and blue part of displayed image 7.
..... Click the link for more information.
..... Click the link for more information.
DRAM types
..... Click the link for more information.
- FPM RAM
- EDO RAM
- Burst EDO RAM
- SDRAM
- SDR SDRAM
- DDR SDRAM
- DDR2 SDRAM
..... Click the link for more information.
This article is copied from an article on Wikipedia.org - the free encyclopedia created and edited by online user community. The text was not checked or edited by anyone on our staff. Although the vast majority of the wikipedia encyclopedia articles provide accurate and timely information please do not assume the accuracy of any particular article. This article is distributed under the terms of GNU Free Documentation License.
Herod_Archelaus
