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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There are 8 kilobits in a kilobyte. For your average vintage microcomputer, EPROMS can be recognised by their clear transparent windows, normally covered by some kind of label.

/ EPROM Adapter | Elektor Magazine

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. Be sure to check when ordering and make sure you get the UV-erasable version unless you want an OTP of course.

There will be an icon or menu selection for this. Furthermore, the article doesn’t cover all of the theory and physics. 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 perom so my current programmer is a Top out of China fig 3.

A 32K (4K x8) UV EPROM Chips, Caps, Pots – Misc. at Arcadeshop, LLC

The software that comes with the programmer will manage the burning process. The Willem requires you to set jumpers and dip switches whereas my Eporm allows chip selection from software. Not just the size but also the manufacturer.


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

Often the pin-outs epprom 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. Here is one of my 27332 regarding the latter. They are cheap and flexible but rprom a bewildering array of jumpers and switches to set. If things are OK, you’re done.

Make sure you know the specs you’re dealing with. The other voltage is the programming voltage Vpp. Usually a status bar shows progress. 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. 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 eprpm, 21v or There are 27732 differences between the “non-standard” TMS made by Texas Instruments and ‘standard” s made by others.

It is not the harmless UV found in disco lights. 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. Typically, my eraser will blank a chip in about 20 minutes. 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!

2732A 32K (4K x8) UV EPROM

The ICs hold code, often an auxiliary program such as an application, utility or game which can be loaded immediately on startup. Willem programmers appear popular fig 2.


After the prefix is a number such as 16, or 32, 64, etc. The incorrect voltage can kill it. If you know the basics though the software is easy enough to follow. TOPS software showing a binary loaded into the buffer and ready to go! These have a “C” between the prefix and size number e.

2532/2732 EPROM Adapter

A couple of VCF folks helped me refine this article. In particular make sure the Vpp is correct and that the IC is oriented correctly and in the right position on the IC wprom.

For example, one manufacturer might use 21vpp for their ICs whereas another may use 25vpp. It may even check automatically.

It’s also inexpensive, is completely software driven and can supply all necessary programming voltages from a USB link. A erom hold 4k and so on.

What you need to do will differ depending the machine. These are inexpensive devices that can be found on eBay.

There are a number of programmers on the market. Once complete, most software allows you to verify that the image in the EPROM is now the same as the one in the buffer. Not all ROM images are available on elrom Web and it’s a good idea to extract the code for posterity and possible future use! Modern programmers use menu-based interfaces that are easy to use. With the chip in place, the first step is to load the code into a buffer prior to burning 273 into the EPROM. One is the READ voltage.