General Business Files

EPROM or Erasable Programmable Read Only Memory is rewritable memory chip that can hold its data without power. A programmed EPROM can keep its data for up to twenty years and can be read indefinite number of times. An Israeli engineer, Dov Frohman invented the EPROM chip in 1971.

EPROM chips are embedded on an external programming device before being used on the circuit board. The EPROM chip requires a costly ceramic chip package with a small quartz window that is sheltered with opaque, sticky tape. For reprogramming, the chip is extracted from the circuit board, the tape is detached and it is placed below a concentrated ultraviolet (UV) light of wavelength 235nm light for approximately 20 minutes.

Some microcontrollers, before the era of EEPROMs and flash memory, used EPROM to store their program. Such microcontrollers include some versions of the Intel 8048, and the “C” edition of the PIC microcontroller. Similar to EPROM chips, such microcontrollers came in windowed (expensive) versions that were handy for debugging and program development. Leaving the die of such a chip exposed to sunlight can change its behavior in unexpected ways.

EPROMs come in several sizes with regard to both packaging and storage capacity. Parts of the same type of EPROM from different manufacturers are intercompatible as long as they’re only being read, there are subtle differences in the programming process.

Most EPROMs can be identified by the programmer by forcing 12V on pin A9 and reading the two bytes of data. However, programmer software would allow manual setting of the chip to ensure proper programming.

EPROMs are the forerunners of the modern EEPROMs and flash memory.

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RAID stands for “Redundant Array of Independent (formerly “Inexpensive”) Disks.” RAID is a collection of hard drives in a computer that is used for performance enhancement and/or fault tolerance.

Windows server versions (Windows NT and 2000 Server, and Windows Server 2003) have built-in support for some levels of RAID, but hardware-based RAID systems provide better performance. The most basic level of RAID uses two hard drives to increase performance, while higher levels store data on two or more drives so that if one fails, the data won’t be lost. SCSI drives are usually used in RAID systems.

In hardware-based RAID systems, it is common for the drives to be removable; they are kept in a caddy that is accessible through an opening in the case. When one fails, it can easily be replaced. More advanced systems employ hot-swappable drives. These are drives that can be removed and replaced without shutting down the system. Naturally, all this technology is much more expensive than standard PCs, so it is used mainly in business and government situations in which downtime and/or data loss would be catastrophic to the operation of the organization.