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Buy 5V 4Kx8 DIP ns EPROM. You may also like: A 27C M27CF1. A 27C M27CBF1. M27C64AF1. A 32K (4K x8) UV EPROM. Out of Stock. $ Qty: Buy Now. Add To Wish List. Item #: Facebook 32Kbit (4Kb x 8) NMOS UV EPROM. 24 pin. A EPROM then can hold 2 kilobytes (k) of code. A can hold 4k and so on. Some EPROMS are low-power CMOS ICs. These have a.

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Rather it provides enough practical tips and information for readers to attempt an EPROM replacement of failed compatible parts.

EPROMS: The minimum you need to know to burn your own

First rule is to know the kind of EPROMS you want or are likely to want to burn eproj get a programmer that can handle them. There will be an icon or menu selection for this. The software that comes with the programmer will manage the burning process. In particular make sure the Vpp is epgom and that the IC is oriented correctly and in the right position on the IC holder.

After the prefix is a number such as 16, or 32, 64, etc.

2732 EPROM

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! Willem programmers appear popular fig 2. Figure 4 shows a screen shot of my programmer with a 4k System 80 ROM image loaded. For example, one manufacturer might use 21vpp for their ICs whereas another may use 25vpp.

There are a number of programmers on the market. They are cheap and flexible but have a bewildering array of jumpers and switches to set. 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.


Typical values are 25v, 21v or The UV wavelength used is the same as that used for sterilizing equipment. If things are OK, you’re done. It is not the harmless UV found in disco lights. Beware though, as many modern ones will not handle the smaller capacity ICs like the and ones found in very old microcomputers. This is why the ICs have a clear window in them; to allow the UV light to penetrate and erase the data. I had a Willem but it died so my current programmer is a Top out of China fig 3.

There are 8 kilobits in a kilobyte. 7232 code needs to be a binary file. This article is just a basic primer. Not just the size but also the manufacturer. A can hold 4k and so on. For your average vintage microcomputer, EPROMS can be recognised by their clear transparent windows, normally covered by some kind of label. These are inexpensive devices that can be found on eBay. The incorrect voltage can kill it.

It’s almost completely unreadable. Be sure to check when ordering and make sure you get the UV-erasable version unless you want eeprom OTP of course.

EPROM Technical Data

The ICs hold code, often an auxiliary program such as an application, utility or game which can be loaded immediately on startup. Getting to grips with EPROM programming, and having the gear to do it, is worthwhile if you want to maintain a vintage computer collection.

The other voltage is the programming voltage Vpp. TOPS software showing a binary loaded into the buffer and ready to go! Some EPROMS don’t have a window and are not erasable even though they have the same part number as the erasable version. Eprmo 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.


It may even check automatically. Don’t look directly at the bulb when the door is open. The Willem requires you to set jumpers and dip switches whereas my TOP allows chip selection from software. Once complete, most software allows you to verify that the image in the EPROM is now the e;rom as the one in the buffer. 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.

With erom chip in place, the first step is to load the code into a buffer prior to eprok it into the EPROM. Fig 1 shows my eraser.

A couple of VCF folks helped me refine this article. Here is an important piece of advice. However the programming devices mentioned below do handle these other chips.

Usually a status bar shows progress. Often the pin-outs of the mask ROM will be different to the EPROM and eprm kind of “adapter” needs to be made to switch the pins around or the board circuitry altered.

One is the READ voltage. Make sure you know the specs you’re dealing with. These have a “C” between the prefix and size number e. Typically, my eraser will blank a chip in about 20 minutes. Once reprogrammed or “burned”they can hold their data for many years. Here is one of my efforts regarding the latter.