| podobné slovo | definícia |
compact disc read-only memory
(msas) | Compact Disc Read-Only Memory
- CD-ROM |
compact disc read-only memory
(msasasci) | Compact Disc Read-Only Memory
- CD-ROM |
compact disc read-only memory
(encz) | compact disc read-only memory, n: |
erasable programmable read-only memory
(encz) | erasable programmable read-only memory,mazatelné programovatelná paměť
pouze pro čtení n: EPROM Petr Menšík |
read-only memory
(encz) | read-only memory,paměť pouze pro čtení |
read-only memory chip
(encz) | read-only memory chip, n: |
compact disc read-only memory
(wn) | compact disc read-only memory
n 1: a compact disk that is used with a computer (rather than
with an audio system); a large amount of digital
information can be stored and accessed but it cannot be
altered by the user [syn: CD-ROM, {compact disc read-only
memory}] |
erasable programmable read-only memory
(wn) | erasable programmable read-only memory
n 1: (computer science) a read-only memory chip that can be
erased by ultraviolet light and programmed again with new
data [syn: erasable programmable read-only memory,
EPROM] |
read-only memory
(wn) | read-only memory
n 1: (computer science) memory whose contents can be accessed
and read but cannot be changed [syn: read-only memory,
ROM, read-only storage, fixed storage] |
read-only memory chip
(wn) | read-only memory chip
n 1: a memory chip providing read-only memory |
compact disc read-only memory
(foldoc) | Compact Disc Read-Only Memory
CD-ROM
CD-ROM drive
(CD-ROM) A non-volatile optical data storage
medium using the same physical format as audio {compact
discs}, readable by a computer with a CD-ROM drive.
CD-ROM is popular for distribution of large databases,
software and especially multimedia applications. The
maximum capacity is about 600 megabytes. A CD can store
around 640 megabytes of data - about 12 billion bytes per
pound weight.
CD-ROM drives are rated with a speed factor relative to music
CDs (1x or 1-speed which gives a data transfer rate of 150
kilobytes per second). 12x drives were common in April
1997. Above 12x speed, there are problems with vibration and
heat. Constant angular velocity (CAV) drives give speeds up
to 20x but due to the nature of CAV the actual throughput
increase over 12x is less than 20/12.
20x was thought to be the maximum speed due to mechanical
constraints but on 1998-02-24, Samsung Electronics
introduced the SCR-3230, a 32x CD-ROM drive which uses a ball
bearing system to balance the spinning CD-ROM in the drive to
reduce noise.
CD-ROM drives may connect to an IDE interface, a SCSI
interface or a propritary interface, of which there are three
- Sony, Panasonic, and Mitsumi. Most CD-ROM drives can also
play audio CDs.
There are several formats used for CD-ROM data, including
Green Book CD-ROM, White Book CD-ROM and {Yellow Book
CD-ROM}. ISO 9660 defines a standard file system, later
extended by Joliet.
See also Compact Disc Recordable, Digital Versatile Disc.
{Byte, February 1997
(http://byte.com/art/9702/sec17/art5.htm)}.
(2006-09-25)
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electrically alterable programmable read-only memory
(foldoc) | Electrically Alterable Programmable Read-Only Memory
EAPROM
(EAPROM) A PROM whose contents can be changed.
[What's the difference between EAPROM and EEPROM?]
(1995-11-12)
|
electrically erasable programmable read-only memory
(foldoc) | Electrically Erasable Programmable Read-Only Memory
(EEPROM) A non-volatile storage device using a
technique similar to the floating gates in EPROMs but with
the capability to discharge the floating gate electrically.
Usually bytes or words can be erased and reprogrammed
individually during system operation.
In contrast to RAM, writing takes much longer than reading
and EEPROM is more expensive and less dense than RAM. It is
appropriate for storing small amounts of data which is changed
infrequently, e.g. the hardware configuration of an Acorn
Archimedes.
[Difference from EAPROM?]
(1995-04-22)
|
erasable programmable read-only memory
(foldoc) | Erasable Programmable Read-Only Memory
EPROM
(EPROM) A type of storage device in which the data
is determined by electrical charge stored in an isolated
("floating") MOS transistor gate. The isolation is good
enough to retain the charge almost indefinitely (more than ten
years) without an external power supply. The EPROM is
programmed by "injecting" charge into the floating gate, using
a technique based on the tunnel effect. This requires higher
voltage than in normal operation (usually 12V - 25V). The
floating gate can be discharged by applying ultraviolet light
to the chip's surface through a quartz window in the package,
erasing the memory contents and allowing the chip to be
reprogrammed.
(1995-04-22)
|
flash erasable programmable read-only memory
(foldoc) | Flash Erasable Programmable Read-Only Memory
FEPROM
Flash EPROM
Flash ROM
(FEPROM, "flash memory") A kind of {non-volatile
storage} device similar to EEPROM, but where erasing can
only be done in blocks or the entire chip.
In 1995 this relatively new technology started to replace
EPROMs because reprogramming could be done with the chip
installed. At that time FEPROMs could be rewritten about 1000
times.
Like EAPROM and ferro-magnetic material, FEPROMs rely on {FN
tunnelling}. Some flash memory supports block erase.
(1995-04-22)
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mask read-only memory
(foldoc) | Mask Read-Only Memory
MROM
(MROM) A kind of ROM in which the memory contents
are determined by one of the masks used to manufacture the
integrated circuit. MROM can give high storage density
(bits per millimeter squared) making it a cheap solution for
high volume applications.
[Other ROM types?]
(1995-04-22)
|
one time programmable read-only memory
(foldoc) | One Time Programmable Read-Only Memory
OTPROM
(OTPROM, EPROM OTP) A kind of storage device like an
EPROM but with no quartz glass window in the package for
erasing the contents. This reduces the packaging cost but
means the device cannot be erased with UV and so can only be
written once. Erasure is possible, but expensive, with
X-rays.
(1995-04-22)
|
programmable read-only memory
(foldoc) | Programmable Read-Only Memory
PROM
(PROM) A kind of ROM which can be written using a
PROM programmer. The contents of each bit is determined by a
fuse or antifuse. The memory can be programmed once after
manufacturing by "blowing" the fuses, which is an irreversible
process. Blowing a fuse opens a connection while blowing an
antifuse closes a connection (hence the name). Programming is
done by applying high-voltage pulses which are not encountered
during normal operation.
(1995-04-22)
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read-only memory
(foldoc) | Read-Only Memory
ROM
(ROM) A type of data storage device which is
manufactured with fixed contents. In its most general sense,
the term might be used for any storage system whose contents
cannot be altered, such as a gramophone record or a printed
book; however, the term is most often applied to
semiconductor integrated circuit memories, of which there
are several types, and CD-ROM.
ROM is inherently non-volatile storage - it retains its
contents even when the power is switched off, in contrast to
RAM.
ROM is often used to hold programs for embedded systems
since these usually have a fixed purpose. ROM is also used
for storage of the lowest level bootstrap software
(firmware) in a computer.
See also Programmable Read-Only Memory.
(1995-05-09)
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