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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Some EPROMS don’t have a window and are not erasable even though they have the same part number as the erasable version. Usually these ICs start with either a or a prefix but there may be others. These are inexpensive devices that can be found on eBay.

However the programming devices datxsheet below do handle these other chips. There are 8 kilobits in a kilobyte. Willem programmers appear popular fig 2.

Once complete, most software allows you to verify that the image in the EPROM is now the same as the one in the buffer. It may even check automatically. There are fundamental differences between the “non-standard” TMS made by Texas Instruments and ‘standard” s made by others.

Try 20 minutes first and if that doesn’t fully erase the chip try again dstasheet a longer interval until you find a time span that does.

EPROMS , , , , , , ,

Otherwise there is great risk of zapping the ROM because voltage is applied to the wrong pin! With the chip in place, the first step is to load the code into a buffer prior to burning datashset into the EPROM. Usually a status bar shows progress. Beware though, as many modern ones will not handle the smaller capacity ICs like the and ones found in very old microcomputers.


Not just the size but also the manufacturer. The ICs hold code, often an auxiliary program such as an application, utility or game which can daasheet loaded immediately on startup. If things are OK, you’re done.

The epom that comes with the programmer will manage the burning process. What you need to do will differ depending the machine. This article is just a basic primer. The code needs to be a binary file. 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. It’s also inexpensive, is completely software driven and can supply all necessary programming voltages from a USB link.

Here is an datashheet piece of advice. This is applied to the Vcc pin and is typically 5 volts. There are a number of programmers on the market. In particular make sure the Vpp is correct and that the IC is oriented correctly and in the right position on the IC holder.

The UV wavelength used is the same as that used for sterilizing equipment. Figure 4 shows a screen shot of my programmer with a 4k System 80 ROM image loaded. They are cheap and flexible but dprom a bewildering array of jumpers and switches to set. If you know the basics though the software is easy enough to follow. Not all ROM images are available on the Web and it’s a good idea to extract the code for posterity and possible future use!


Make sure you know the specs you’re dealing with. There will be an icon or menu selection for this. 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. 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.

One is the READ voltage. It seems to work well, epro, at the time of writing the manual for this Chinese device appears to have been written using an early version of Google Translator!

IC Datasheet: 2732 EPROM

After the prefix is a number such as 16, or 32, 64, etc. Typical values are 25v, 21v or The incorrect voltage can kill it. Modern programmers use menu-based interfaces that are easy to use. It is not the harmless UV found in disco lights.