Details, datasheet, quote on part number: DESCRIPTION The a 32, bit UV erasable and electrically programmable memory EPROM. It is organized. Donor challenge: Your generous donation will be matched 2-to-1 right now. Your $5 becomes $15! Dear Internet Archive Supporter,. I ask only. Buy 5V 4Kx8 DIP ns EPROM. [61 KB ]; Data Sheet (current) [92 KB ]; Fairchild Semiconductors [ KB ]; Representative Datasheet, MFG may vary.

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There are 8 kilobits in a kilobyte. The other voltage is the programming voltage Vpp. Often the pin-outs of the mask ROM will be different to the EPROM and some kind of “adapter” needs to be made to switch the pins around or the board circuitry altered. These have a “C” between the prefix and size number e. In particular make sure the Vpp is correct and that the IC is oriented correctly and in the right position on the IC holder.

Be sure to check when ordering and make sure you get the UV-erasable version unless you want an OTP of course. Don’t look directly at the bulb when the door is open.

First rule is to know the kind of EPROMS you want or are likely to want to burn and get a programmer that can handle them. Not all ROM images are available on the Datashfet and it’s a good idea to extract the code for posterity and possible future use! Some EPROMS don’t have a window and are not erasable even though they have the datazheet part number as the erasable version.


Mask ROMS have embedded code that can’t be changed. It is not the harmless UV found in disco lights.

Not just the size but also the manufacturer. From time to time those of us with the passion to preserve ancient computers from the and s will come across the need to replace a failed masked ROM or EPROM.

IC Datasheet: 2732 EPROM

It’s almost completely unreadable. The incorrect voltage can kill it. A couple of VCF folks helped me refine this article.

However the programming dwtasheet mentioned below do handle these other chips. They are cheap and flexible but have a bewildering array of jumpers and switches to set.

The software that comes with the programmer will manage the burning process. It’s also inexpensive, is completely software driven and can supply all necessary programming voltages from a USB link.

There are fundamental differences between the “non-standard” TMS made by Texas Instruments and ‘standard” s eprpm by others. After the prefix is a number such as 16, or 32, 64, etc.

There are a number of programmers on the market. Once reprogrammed or “burned”they can hold their data for many years. Fig 1 shows my eraser. TOPS software showing a binary loaded into the buffer and ready to go!

Make sure you know the specs you’re dealing with. Beware though, as many modern ones will not handle the smaller capacity ICs like the and ones found in very old microcomputers. I had a Willem but it died so my current programmer is a Top out of China fig 3. Usually these ICs start with either a or a prefix but there may be others.


There will be an icon or menu selection for this. These are inexpensive devices that can be found on eBay. Modern programmers use menu-based interfaces that are easy to use. It seems to work well, although at the time of writing the manual for this Chinese device appears to have been written using an early version of Google Translator! It may even check automatically. Typical values are 25v, 21v or Once complete, most software allows you to verify that the image in the EPROM is now the same as the one in the buffer.

A can hold 4k and so on. With the chip in place, the first step is to load the code into a buffer prior to burning it into the EPROM. This is why the ICs have a clear window in them; to allow the UV light to penetrate and erase the data.

The code needs to be a binary file.

EPROMS , , , , , , ,

Here is one of my efforts regarding the latter. One is the READ voltage. Usually a status bar shows progress. For your average vintage microcomputer, EPROMS can be recognised by their clear transparent windows, epprom covered by some kind of label.

If you know the basics though the software is easy enough to follow. This is applied to the Vcc pin and is typically 5 volts. The UV wavelength used is the same as that used for sterilizing equipment.