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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This is why the Eproj have a clear window in them; to allow the UV light to penetrate and erase the data. Here is one of my efforts regarding the latter. In particular make sure the Vpp is correct and that the IC is oriented correctly and in the right position on the IC holder. There are a number of programmers on the market. Rather it provides enough practical tips and information for readers to attempt an EPROM replacement of failed compatible parts.

Furthermore, the article doesn’t cover all of the theory and physics.

EPROMS , , , , , , ,

If you know the basics though the software is easy enough ratasheet follow. TOPS software showing a binary loaded into the buffer and ready to go!

Often the pin-outs of the mask ROM will datwsheet different to the EPROM and some kind of “adapter” needs to be made to switch the pins around or the board circuitry altered. Don’t look directly at the bulb when the door is open.

There will be an icon or menu selection for this. There are 8 kilobits in a kilobyte. These are explained in this Google Groups postingwhich also elaborates on the and series datashet how they differ from or, in the case of theare the same as 27xx EPROMS of the same size.


Be sure to check when ordering and make sure you get the UV-erasable version unless you want an OTP of course. They are cheap and flexible but have a datasneet array of jumpers and switches to set. Willem programmers appear popular fig 2. A couple of VCF folks helped me refine this article. Typical values are 25v, 21v or Not just the size but also the manufacturer. However the programming devices mentioned below do handle these other chips.

Usually these ICs start with either a or a prefix but there may be others. It’s 22732 inexpensive, is completely software driven and can supply all necessary programming voltages from a USB link.

These have a “C” between the prefix and size number e.

Datasheet(PDF) – Fairchild Semiconductor

It is not the harmless UV found in disco lights. One is the READ voltage. The incorrect voltage can kill it. After the prefix is a number such as 16, or eprm, 64, etc. For example, one manufacturer might use 21vpp for their ICs whereas another may use 25vpp.

IC Datasheet: 2732 EPROM

The software that comes with the programmer will manage the burning process. Here is an important piece of advice. Figure 4 shows a screen shot of my programmer with a 4k System 80 ROM image loaded. Beware though, as many modern ones will not handle the smaller capacity ICs like the and ones found in very old microcomputers.

This is applied to the Vcc pin and is typically 5 volts. If things are OK, you’re done. Mask ROMS have embedded code datasheeh can’t be changed. There are fundamental differences between the “non-standard” TMS made by Texas Instruments and ‘standard” s made by others. 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.


The UV wavelength used is the same as that used for sterilizing equipment. 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! The Willem requires you to set datazheet and dip switches whereas my TOP allows chip selection from software.

Usually a status bar shows progress. What you need to do will differ depending the machine.

This article is just a basic primer. Otherwise there is great risk of zapping the ROM because voltage is applied to the wrong pin! It’s almost completely unreadable. With the chip in place, the first step datasheey to load the code into a buffer prior to burning it into the EPROM.

The ICs hold code, often an auxiliary program such as an application, utility or game which can be loaded immediately on startup.

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! Getting to grips with EPROM programming, and having the gear to do it, is worthwhile if you want to maintain a vintage computer collection. Once reprogrammed or datashertthey can hold their data for many years. Fig 1 shows my eraser.