An EPROM: the Texas Instruments TMS27C040, a CMOS chip with 4 megabits of storage and 8-bit output (shown here in a 600-mil ceramic dual-in-line package). The TMS27C040 operates at 5 volts, but must be programmed at 13 volts.[1]
Not to be confused with EEPROM.
Computer memory and Computer data storage types
General
Memory cell
Memory coherence
Cache coherence
Memory hierarchy
Memory access pattern
Memory map
Secondary storage
MOS memory
floating-gate
Continuous availability
Areal density (computer storage)
Block (data storage)
Object storage
Direct-attached storage
Network-attached storage
Storage area network
Block-level storage
Single-instance storage
Data
Structured data
Unstructured data
Big data
Metadata
Data compression
Data corruption
Data cleansing
Data degradation
Data integrity
Data security
Data validation
Data validation and reconciliation
Data recovery
Storage
Data cluster
Directory
Shared resource
File sharing
File system
Clustered file system
Distributed file system
Distributed file system for cloud
Distributed data store
Distributed database
Database
Data bank
Data storage
Data store
Data deduplication
Data structure
Data redundancy
Replication (computing)
Memory refresh
Storage record
Information repository
Knowledge base
Computer file
Object file
File deletion
File copying
Backup
Core dump
Hex dump
Data communication
Information transfer
Temporary file
Copy protection
Digital rights management
Volume (computing)
Boot sector
Master boot record
Volume boot record
Disk array
Disk image
Disk mirroring
Disk aggregation
Disk partitioning
Memory segmentation
Locality of reference
Logical disk
Storage virtualization
Virtual memory
Memory-mapped file
Software entropy
Software rot
In-memory database
In-memory processing
Persistence (computer science)
Persistent data structure
RAID
Non-RAID drive architectures
Memory paging
Bank switching
Grid computing
Cloud computing
Cloud storage
Fog computing
Edge computing
Dew computing
Amdahl's law
Moore's law
Kryder's law
Volatile
RAM
Hardware cache
CPU cache
Scratchpad memory
DRAM
eDRAM
SDRAM
SGRAM
LPDDR
QDRSRAM
EDO DRAM
XDR DRAM
RDRAM
DDR
GDDR
HBM
SRAM
1T-SRAM
ReRAM
QRAM
Content-addressable memory (CAM)
Computational RAM
VRAM
Dual-ported RAM
Video RAM (dual-ported DRAM)
Historical
Williams–Kilburn tube (1946–1947)
Delay-line memory (1947)
Mellon optical memory (1951)
Selectron tube (1952)
Dekatron
T-RAM (2009)
Z-RAM (2002–2010)
Non-volatile
ROM
Diode matrix
MROM
PROM
EPROM
EEPROM
ROM cartridge
Solid-state storage (SSS)
Flash memory is used in:
Solid-state drive (SSD)
Solid-state hybrid drive (SSHD)
USB flash drive
IBM FlashSystem
Flash Core Module
Memory card
Memory Stick
CompactFlash
PC Card
MultiMediaCard
SD card
SIM card
SmartMedia
Universal Flash Storage
SxS
MicroP2
XQD card
Programmable metallization cell
NVRAM
Memistor
Memristor
PCM (3D XPoint)
MRAM
Electrochemical RAM (ECRAM)
Nano-RAM
CBRAM
Early-stage NVRAM
FeRAM
ReRAM
FeFET memory
Analog recording
Phonograph cylinder
Phonograph record
Quadruplex videotape
Vision Electronic Recording Apparatus
Magnetic recording
Magnetic storage
Magnetic tape
Magnetic-tape data storage
Tape drive
Tape library
Digital Data Storage (DDS)
Videotape
Videocassette
Cassette tape
Linear Tape-Open
Betamax
8 mm video format
DV
MiniDV
MicroMV
U-matic
VHS
S-VHS
VHS-C
D-VHS
Hard disk drive
Optical
3D optical data storage
Optical disc
LaserDisc
Compact Disc Digital Audio (CDDA)
CD
CD Video
CD-R
CD-RW
Video CD
Super Video CD
Mini CD
Nintendo optical discs
CD-ROM
Hyper CD-ROM
DVD
DVD+R
DVD-Video
DVD card
DVD-RAM
MiniDVD
HD DVD
Blu-ray
Ultra HD Blu-ray
Holographic Versatile Disc
WORM
In development
CBRAM
Racetrack memory
NRAM
Millipede memory
ECRAM
Patterned media
Holographic data storage
Electronic quantum holography
5D optical data storage
DNA digital data storage
Universal memory
Time crystal
Quantum memory
UltraRAM
Historical
Paper data storage (1725)
Punched card (1725)
Punched tape (1725)
Plugboard
Drum memory (1932)
Magnetic-core memory (1949)
Plated-wire memory (1957)
Core rope memory (1960s)
Thin-film memory (1962)
Disk pack (1962)
Twistor memory (~1968)
Bubble memory (~1970)
Floppy disk (1971)
v
t
e
Early type of solid state computer memory
An EPROM (rarely EROM), or erasable programmable read-only memory, is a type of programmable read-only memory (PROM) chip that retains its data when its power supply is switched off. Computer memory that can retrieve stored data after a power supply has been turned off and back on is called non-volatile. It is an array of floating-gate transistors individually programmed by an electronic device that supplies higher voltages than those normally used in digital circuits. Once programmed, an EPROM can be erased by exposing it to strong ultraviolet (UV) light source (such as from a mercury-vapor lamp). EPROMs are easily recognizable by the transparent fused quartz (or on later models resin) window on the top of the package, through which the silicon chip is visible, and which permits exposure to ultraviolet light during erasing.[2]
^Texas Instruments (1997), TMS27C040 524,288 BY 8-BIT UV ERASABLE TMS27PC040 524,288 BY 8-BIT PROGRAMMABLE READ-ONLY MEMORY
^"CPU History - EPROMs". www.cpushack.com. Retrieved 2021-05-12.
An EPROM (rarely EROM), or erasable programmable read-only memory, is a type of programmable read-only memory (PROM) chip that retains its data when its...
usually of identical type as the EPROM, but the chip package had no quartz window; because there was no way to expose the EPROM to ultraviolet light, it could...
ROM for code storage, but with its spinoff it was soon upgraded to use EPROM and then EEPROM, which made it possible for end-users to program the devices...
hot-carrier injection. But in general, programmable memories, including EPROM, of early 1970s had reliability and endurance problems such as the data...
their erasable counterparts EPROMs. A significant variety of encoding formats were developed for use in computer and ROM/EPROM data transfer. Encoding formats...
electric charges similar to EPROM. Consequently, flash memory can hold information for years, but possibly not as many years as EPROM. As of 2005, most CPLDs...
MIDI interfaces for the DMX. Drum and percussion samples are stored in EPROM chips placed on removable voice cards. The data format is 8-bit PCM using...
semiconductor chip as an ultraviolet-erasable programmable read-only memory (UV-EPROM), but the finished device is put into an opaque package, instead of the...
slots, which accommodate proprietary RAM, EPROM or flash cards, the third slot being equipped with a built-in EPROM programmer. Card capacities range from...
non-volatile. Examples of non-volatile memory are flash memory and ROM, PROM, EPROM and EEPROM memory. Examples of volatile memory are dynamic random-access...
non-volatile memory – either read-only memory (ROM) or programmable memory such as EPROM, EEPROM, or flash. Changing a device's firmware stored in ROM requires physically...
device. The Nascom 2 allowed a second 2Kbyte character generator ROM (or EPROM) to be fitted (approximate price £20 in 1980) . The so-called NAS-GRA ROM...
2000, WaferScale Integration Inc. (WSI, Fremont, California), a vendor of EPROM and flash memory-based programmable system-chips; In 2002, Alcatel's Microelectronics...
systems. The Bytesaver had sockets for 8 UV-erasable EPROMs providing up to 8 Kbytes of storage. The EPROMs could be programmed by the Bytesaver, or read as...
I/O chip or an embedded controller. Motherboards contain a ROM (and later EPROM, EEPROM, NOR flash) that stores firmware that initializes hardware devices...
(2009) Chroma Chords (2013) In Praise Of Darkness (with Eprom as Shades) (2018) From A Vein (with Eprom as Shades) (2022) Hellion (with Headland) (2023) Triple...
and 10BASE-T are used. The DIP-28 (U1) EPROM for network booting may be 8, 16, or 32 KB in size. This means EPROMs of type 64, 128, and 256 kbit (2^10)...
Corporation, he is the inventor of the erasable programmable read only memory (EPROM) and the founder and first general manager of Intel Israel. He is also the...
die from an Intel 8742, an 8-bit microcontroller that includes a CPU running at 12 MHz, 128 bytes of RAM, 2048 bytes of EPROM, and I/O in the same chip...
Global Information