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The other voltage is the programming voltage Vpp. These have a “C” between the prefix and size number e.
2532/2732 EPROM Adapter
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. Willem programmers appear popular fig 2.
Here is an important piece of advice. Otherwise there is great risk of zapping the ROM because voltage is applied to the wrong pin! The ICs hold code, often an auxiliary program such as an application, utility or game which can be loaded immediately on eprim.
Once reprogrammed or “burned”they can hold their data for many years. Usually a status bar shows progress. This is 27732 to the Vcc pin and is typically 5 volts.
EPROM Technical Data
I had a Willem but it died so my current programmer is a Top out of China fig 3. 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.
For example, one manufacturer might use 21vpp for their ICs whereas another may use 25vpp. The code needs to be a binary file. In particular make sure the Vpp is correct and that the IC is oriented correctly and in the right position on the IC holder. It seems to work well, although at the time of writing the manual for this Chinese 273 appears to have been written using an early version of Google Translator!
It’s also inexpensive, is completely software driven and can supply all necessary programming voltages from a USB link.
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! Not just the size but also the manufacturer. Modern programmers use menu-based interfaces that are easy to use. A can hold 4k and so on. Fig 1 shows my eraser.
After the prefix is a number such as 16, or 32, 64, etc. A couple of VCF folks helped me refine this article. 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. There are fundamental differences between the “non-standard” TMS made by Texas Instruments and ‘standard” s made by others.
The incorrect voltage can kill it.
/ EPROM Adapter | Elektor Magazine
For your average vintage microcomputer, EPROMS can be recognised by their clear transparent windows, normally covered by some kind of label.
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.
There are 8 kilobits in a kilobyte. The Willem requires you to set jumpers and dip switches whereas my TOP allows chip selection from software. It’s almost completely unreadable.
Usually these ICs start with either a or a prefix but there may be others. Be sure to check when ordering and make sure you get the UV-erasable version unless you want an OTP of course.
Getting eprm grips with EPROM programming, and having the gear to do it, is worthwhile if you want to maintain a vintage computer collection. The UV wavelength used is the same as that used for sterilizing equipment.
However the programming devices mentioned below do handle these other chips. Figure 4 shows a screen shot of my programmer with a 4k System 80 ROM image loaded. Typically, my eraser will blank a chip in about 20 minutes. From time to time those of us with the passion to preserve ancient computers from the and s will epro, across the need to replace a failed masked ROM or EPROM.
The software that comes with the programmer wprom manage the burning process. 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. Typical values are 25v, 21v or It may even check automatically.
TOPS software showing a binary loaded into the buffer and ready to go! What you need to do will differ depending the machine. One is the READ voltage. Beware though, as many modern ones will not handle the smaller capacity ICs like the and ones found in very old microcomputers.