129809647272711250_585Derived a few varieties of read-only memory (such as a character generator) with outside of read-only memory needed for different users different content. For ease of use and mass production, the further development of a programmable read-only memory (PROM), erasable programmable read-only memory (EPROM) and electrically erasable programmable read-only memory (EPROM）。 For example early personal computers such as the Apple II and IBM PC XT/AT boot program (operating system) or other micro-computer system Firmware (Firmware). Features EPROM required long time exposure to UV erasure, is not easy to use. The EPROM in the 1980 of the 20th century conductorEEPROM, overcome the lack of EPROM, but integration is not high, prices are more expensive. So they developed a new type of storage unit with similar flash EPROM memory. Its high integration, low power consumption, small size and quick erase online, and access to rapid development, and has the potential to replace the existing hard disks and floppy disksAs the primary mass storage media. Most of the read-only memory using metal-oxide-semiconductor (MOS) field-effect controls. Type 1. ROM read-only memory (Read-Only Memory) is a read only data memory. CDROM in the manufacturing process, information in a specially made mask (mask) burn in line, Its content cannot be changed since it was written, so is sometimes known as the "mask of read-only memory" (mask ROM). Lower manufacturing costs for the memory, commonly used in the computer start-up. 2.PROM programmable read-only memory (Programmable ROM,PROM) has determinant of occupation, as requiredUse current blowing it, write the required information, but can only be written once recorded. 3.EPROM erase programmable read-only memory (Erasable Programmable Read Only Memory,EPROM) high voltage can be used to write information programming, erase lines when exposed to ultraviolet light, are fundedMaterials can be cleared
Rift CD-key, and reusable. Usually in the package will be reserved on a quartz window transparent so as to facilitate the exposure. 4.OTPROM programmable read only memory (One Time Programmable Read Only Memory,OPTROM) writes of principle with the EPROM, but for sectionCost, programmed to not erase, so there is no set transparent window. 5.EEPROM-e can erase programmable read-only memory (Electrically Erasable Programmable Read Only Memory,EEPROM) principle of operation is similar to EPROMBut erasing is done using high electric fields to, so there's no need for transparent Windows. 6. Flash memory Flash memory (Flash memory) of each memory cell with a "control lock" and "floating gate", with high electric field change of floating gate voltage limit programmed actions can be carried out. 7. Flash memory from the game master fileCassette memory or genuine game game master file extraction, can be used on various types of simulators. Such as Arcade emulators, GBA emulator ROM, is exactly what this means. ROM and RAM describes the range of different RAM-RandomAccessMemory of volatile random-access memory, high speed access, read and write timeAnd regardless of the address
SWTOR Power Leveling, such as computer memory. ROM-Read Read-Only Memory is memory. Information is not lost after power, such as the computer boot BIOS chip. Access speed is very low (more RAM) and cannot be overwritten.
Because you cannot overwrite the information can not be upgraded, and is now rarely used. EPROM,EEPROM,Flash ROM (NOR Flash and NADN Flash), performance with the ROM, but can be overwritten, general reading is faster than write, write than read high voltage, (read write 12V 5V) but Flash can read and write under the same voltage, and high capacity low cost, such as a USB flash drive in MP3 is widely used. In a computer system,RAM is used as a memory, ROM to hold some of the drivers for the hardware, or firmware. According to the entered address select a Works address decoder output (line), driven by it to the line of the question line, on line to read the codes stored in storage units. Figure a is stored on a fuse under the symbol 8x4ROM (usually "Line x-line "to indicate the storage capacity of the memory) of the schematic diagram. It is said to preserve the fuse into "0", credited to fuse fuse is "1". For example, deposit of 1 is "1011". In ROM, usually sets the selected port (also writing). When = 0 o'clock ROM work when =1,ROM is disabled, its output is"1"-level or high-resistance State.
Words used to expansion ROM. ROM address decoder is a combination of doors, its output is the minimum of all addresses are entered. Decoders can be expressed as shown in Figure b and arrays, and array of horizontal and vertical lines at the intersection of "points" that "and" link. Storage unit is in fact or combination of doors
Diablo 3 CD-KEY, rOM number of output of the Sanhedrin. Decoder for each minimum may be or the door to enter, however, can become a minimum item or enter depends on the storage of information, storage unit as a or array. The analysis on, from another point of view of ROM structure: it consists of two arrays--"and" gate array "or" gate array,"Or" is set by the user, thus it is programmable, but with an array is used to form all the minimum, thus is not programmed. ROM form also has a wide range. ROM,ROM is a fuse manufacturer providing product or array all of the fuses, written by the users of information, then content cannot change, this type of ROM known as programmable read-only memory, short PROM. After another ROM is write information, UV irradiation or electric methods available erasing and writing new content, called a ROM before the rewrite ROM, EPROM for short, which can overwrite the ROM, EEPROM for short. There is a ROM's stored information is in the manufacturingIn the course of, integrated circuit manufacturer design according to store content provided by users prior to Photolithography mask, method of manufacture or manufacture of storage components to store information, this type of ROM called "hide your model read-only memory", referred to as MROM.
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