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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Fig 1 shows my eraser. The Willem requires you to set jumpers and dip switches whereas my TOP allows chip selection from software. There 2372 8 kilobits in a kilobyte. They are cheap and flexible but have a bewildering array of jumpers and dataheet to set. Usually a status bar shows progress. The software that comes with the programmer will manage the burning process. 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.

A can hold 4k and so on. It is not the harmless UV found in disco lights. Not just the size but also the manufacturer. Usually these ICs start with either a or a prefix but there may be others. Here is one of datssheet efforts regarding the latter.

I had a Willem but it died so my current programmer is a Top out of China fig 3. It may even datasehet automatically. Once complete, most software allows you to verify that the image in the EPROM is now the same as the one in the buffer. However the programming devices mentioned below do handle these other chips.

Willem programmers appear popular fig 2. Mask ROMS have embedded code that can’t be changed. A couple of VCF folks helped me refine this article. 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.


One is the READ voltage.

Datasheet(PDF) – Fairchild Semiconductor

It’s also inexpensive, is completely software driven and can supply all necessary programming voltages from a USB link. Eprmo, my eraser will blank a chip in about 20 minutes. For example, one manufacturer might use 21vpp for their ICs whereas another may use 25vpp. Once reprogrammed or “burned”they can hold their data for many years.

IC Datasheet: 2732 EPROM

This is applied to the Vcc pin and is typically 5 volts. There are a number of programmers on the market. Make sure you know the specs you’re dealing with. Otherwise there is great risk of zapping the ROM because voltage is applied to the wrong pin!

Be sure ratasheet check when ordering and make sure you get the UV-erasable version unless you want an OTP of course. These are explained in this Google Groups posting dtasheet, which 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. Furthermore, the article doesn’t cover all of the theory and physics. Getting to grips with EPROM programming, and having the gear to do it, is worthwhile if you want to maintain a vintage computer collection.

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

EPROMS , , , , , , ,

Figure 4 shows a screen shot of my programmer with a 4k System 80 ROM image loaded. TOPS software showing a binary loaded into the buffer and ready to go! If you know the basics dprom the datzsheet is easy enough to follow.


With the chip in place, the first step is 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.

This is why the ICs have a clear window in them; to allow the UV light to penetrate and erase the data. Some EPROMS don’t have a window and are not erasable even dataheet they have the same part number as the erasable version.

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

After the prefix is a number such as 16, or 32, 64, etc. There will be an icon or menu selection for this. There are fundamental differences between the “non-standard” TMS made by Texas Instruments and ‘standard” s datwsheet by others. The incorrect voltage can kill it. If things are OK, you’re done.

Don’t look directly at the bulb when the door is open. Darasheet values are 25v, 21v or 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! Here is an important piece of advice.

Modern programmers use menu-based interfaces that are easy to use. These are inexpensive devices that can eproom found on eBay. 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 other voltage is the programming voltage Vpp.