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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These are inexpensive devices that can be found on eBay. TOPS software showing a binary loaded into the buffer and ready to go! Make sure you know the specs you’re dealing with.

The UV wavelength used is the same as that used for sterilizing equipment.

IC Datasheet: 2732 EPROM

This is why the ICs have a clear window in them; to allow the UV light to penetrate and erase the data. A can hold 4k and so on. Typical values are 25v, 21v or However the programming devices mentioned below eprkm handle these other chips.

Be sure to check when ordering and make sure you get the UV-erasable version unless you want an OTP of course. The ICs hold code, often an auxiliary program such as an application, utility or game which can be loaded immediately on startup.


In particular make sure the Vpp is correct and that the IC is oriented correctly and in the right position on the IC holder. One is the READ voltage.

Getting to grips with EPROM programming, and having the gear to do it, is worthwhile if you want to maintain a vintage computer datsaheet. Fig 1 shows my eraser.

IC Datasheet: EPROM : Free Download, Borrow, and Streaming : Internet Archive

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. With the chip in place, the first step datasbeet to load the code into a buffer prior to burning it into the EPROM.

ddatasheet The Willem requires you to set jumpers and dip switches whereas my TOP allows chip selection from software. Usually these ICs start with either a or a prefix but there may be others. 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.

This article is just a basic primer.

What you need to do will differ depending the machine. Usually a status bar shows progress. This is applied to the Vcc pin and is typically 5 volts.

EPROMS , , , , , , ,

Willem programmers appear popular fig 2. Not just the size but also the manufacturer. Furthermore, the article doesn’t cover all of the theory and physics.


I had a Willem but it died so my current programmer is a Top out of China fig 3.

Rather it provides enough practical tips and information for readers to attempt an EPROM replacement of failed compatible parts. They are cheap and flexible but have a bewildering array of jumpers and switches to set.

The software that comes with the programmer will manage the burning process. Once reprogrammed or “burned”they can hold their data for many years. The incorrect voltage can kill it. 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! If you know the basics though the software is easy enough to follow.

Otherwise there is great risk of zapping the ROM because voltage is applied to the wrong pin! 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 eprpm circuitry altered.

A couple of VCF folks helped me refine this article.