EPROM is a non-volatile memory chip that retains its data when the power supply is switched off. EPROM memory is an array of floating-gate transistors individually programmed by an electronic device that supplies higher voltages than those normally used in digital circuits.

You can only erase EPROM memory by exposing it to strong UV light, usually with a wavelength of 235nm and belonging to the UVC range of UV light. You can easily recognize these lights by the transparent fused quartz window in the top of the package, through which you can see the silicon chip and which permits UV light during erasing.

An erasable programmable read only memory (EPROM) can hold data for up to twenty years. You can access this data an unlimited number of times. You need to keep the erasing window covered with a foil label to prevent accidental erasure by sunlight.

You can find EPROM memory in many sizes, both physical and capacity. While parts of the same type number from different manufacturers are compatible, there are subtle differences in the programming processes.

Consider the following options when looking to make EPROM memory upgrades:

1. Review your needs, possibly using a diagnostic tool, before making an EPROM memory computer upgrade.
2. When you purchase an EPROM memory upgrade, make
sure the vendor provides some sort of technical support.
3. Make sure that you understand the importance of protecting the EPROM upgrade from light and other harmful entities (such as dust, dirt, moisture) while installing it in your computer.

Action Steps
The best contacts and resources to help you get it done

Locate technical information on erasable programmable read only memory (EPROM)

Technical information on EPROM memory is important to know when seeking to make an EPROM upgrade. When making EPROM memory computer upgrades, it is important to do it properly and to follow proper steps to protect the EPROM memory chip, universal EPROM programmer and any USB EPROM programmer.

I recommend: Tech-FAQ provides details on what EPROM memory is and how to make EPROM memory upgrades. TechTarget also explains in good detail what EPROM memory is and also offers tips on installing EPROM memory upgrades. AR Labs provides, in great detail, information on EPROM memory and EPROM memory computer upgrades.

Find diagnostic tools that help you decide whether to make EPROM memory upgrades

Diagnostic tools can be a great help in determining whether you have a faulty EPROM memory chip or need to make EPROM memory upgrades. It is important to make sure you need to replace your EPROM memory or make an EPROM memory upgrade. These tools can be found quite easily just by searching for them.

I recommend: Line 6 provides instructions on checking the EPROM memory for diagnostic issues. North Dakota State University provides a step-by-step process in which you can check to see if your EPROM memory was erased. RadarScope explains the various parts of an EPROM emulator and provides schematics on how to test the EPROM memory for problems.

Locate various products and suppliers of EPROM memory upgrades

You can find EPROM upgrades throughout the Internet at many vendors. When searching for EPROM memory upgrades, it is important to find the right part and also make sure that the vendor offers technical support for that EPROM memory.

I recommend: Crucial provides a search engine to ensure you are getting the proper EPROM memory upgrade and also offers technical information on these parts. 4 All Memory is another vendor with a wide selection of EPROM upgrades available and also provides a system check online where you can check your current configuration for problems. Computer Memory Outlet is another vendor that provides a step-by-step process to determine if you have EPROM memory problems and also provides a technical support section with FAQs.

Tips & Tactics

Helpful advice for making the most of this Guide

• •  When making computer upgrades, especially to EPROM memory, it is important to make sure you need to replace it. If you are having problems, it may not be the EPROM memory causing it.
• •  Protection of the delicate parts inside a PC is of utmost importance. Make sure you follow all technical specs and manufacturers' instructions when taking a PC apart. Especially important is to protect internal parts, such as the EPROM memory, EPROM writer and EPROM emulator from dust, dirt, moisture and, most important, light. Sunlight can damage these parts but so can any source of UV lighting, such as fluorescent lights.