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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A can hold 4k and so on.

2732A 32K (4K x8) UV EPROM

The software that comes with the programmer will manage the burning process. There are fundamental differences between the “non-standard” TMS made by Texas Instruments and ‘standard” s made by others.

Not just the size but also the manufacturer. Some EPROMS don’t have a window and are not erasable even though they have the same part number as the erasable version. These are inexpensive devices that can be found on eBay. The Willem requires you to set jumpers and dip switches whereas my TOP allows chip selection from software. The ICs hold code, often an auxiliary program such as an application, utility or game which can be loaded immediately on startup.

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.


Be sure to check when ordering and make sure you get the UV-erasable version unless you want an OTP of course. It’s also inexpensive, is completely software driven eorom can supply all necessary programming voltages from a USB link. Once complete, most software allows you to verify that the image in the EPROM is now the same as the one in the buffer.

The UV wavelength used is the same as that used for sterilizing equipment. Getting to grips with EPROM programming, and having the gear epro, do it, is worthwhile if you want to maintain a vintage computer collection.

It is not the harmless UV found in disco lights. There are 8 kilobits in a kilobyte.

2532/2732 EPROM Adapter

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

What you need to do will differ depending the machine. With the chip in place, the first step is to load the code into a buffer prior to burning it into the EPROM. 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.


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. Figure 4 shows a screen shot of my programmer with a 4k System 80 ROM image loaded. The code needs to be a binary file.

EPROM: ICs & Processors | eBay

Typically, my eraser will blank a chip in about 20 minutes. They are cheap and flexible but sprom a bewildering array of jumpers and switches to set. There will be an icon or menu selection for this. Make sure you know the specs you’re dealing with. Here is an important piece of advice.

Beware though, as many modern ones will not handle the smaller capacity ICs like perom and ones found in very old microcomputers. It’s almost completely unreadable. If you know the basics though the software is easy enough to follow. The other voltage is the programming voltage Vpp. Mask ROMS have embedded code that can’t be changed. For example, one manufacturer might use 21vpp for their ICs whereas another may use 25vpp. In particular make sure the Vpp is correct and that the IC is oriented correctly and in the right position on the IC holder.