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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Mask ROMS have embedded code that can’t be changed. This is why the ICs datasheet a clear window in them; to allow the UV light to penetrate and erase the data. The ICs hold code, often an auxiliary program such as an application, utility or game which can be loaded immediately on startup.

In particular make sure the Vpp is correct and that datashet IC is oriented correctly and in the right position on the IC holder. Modern programmers use menu-based interfaces that are easy to use.

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. There are datasheett differences between the “non-standard” TMS made by Texas Instruments and ‘standard” s made by others.

EPROM Technical Data

Some EPROMS don’t have a window and are not erasable even though they have the same part number as the erasable version. I had a Willem but it died so my current programmer is a Top out of China fig 3.

For example, one manufacturer might use 21vpp for their ICs whereas another may use 25vpp. Usually these ICs start with either a or a prefix but there may be others.


Usually a status bar shows progress. Rather it provides enough practical tips and information for readers to attempt an EPROM replacement of failed compatible parts. The other voltage is the programming voltage Vpp.

IC Datasheet: 2732 EPROM

It may even check automatically. Not all ROM images are available on the Eprkm and it’s a dstasheet idea to extract the code for posterity and possible future use!

TOPS software showing a binary loaded into the buffer and ready to go! There are a number of programmers on the market. Beware though, as many modern ones will not handle the smaller capacity ICs like the and ones found in very old microcomputers. The UV wavelength used is the same as that used for sterilizing equipment. These are inexpensive devices that can be found on eBay. Be sure to check when ordering and make sure you get the UV-erasable version unless you want an OTP of course.

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! 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.

They are cheap dataeheet flexible but have a bewildering array of jumpers and switches to set.

If you know the basics though the software is easy enough to follow. If things are OK, you’re done. A couple of VCF folks helped me refine this article. It’s almost completely unreadable. What you need to do will differ depending the machine. 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.

Here is one of my efforts regarding the latter. A can hold 4k and so on. The incorrect voltage can kill it. The code needs to be a binary file. Don’t look directly at the bulb when the door is open. Make sure you know the specs you’re dealing with. Not just the size but also the manufacturer. Typical values are 25v, 21v or This is applied to the Vcc pin and is typically 5 volts. These are explained in this Google Groups postingwhich also elaborates on the and series and how they differ from or, in the case of theare the same as 27xx EPROMS of the same size.


Try 20 minutes first and if that doesn’t fully erase the chip try again with a longer interval until you find a time span that does. After the prefix is a number such as 16, or 32, 64, etc. It is not the harmless UV found in disco lights.

With the chip in place, the first step is to load the code into a buffer prior to burning it into the EPROM. Here is an important piece of advice. The software that comes with the programmer will manage the burning process. There are 8 kilobits in a kilobyte.

Figure 4 shows a screen shot of my programmer with a 4k System 80 ROM image loaded. However the programming devices mentioned below do handle these other chips. There will be an icon or menu selection for this.

For your average vintage microcomputer, EPROMS can be recognised by their clear transparent windows, normally covered by some kind of label. Once complete, most dataseet allows you to verify that the image in the EPROM is now the same as the one in the buffer. It’s also inexpensive, is completely software driven and can supply all necessary programming voltages from a USB link.