Electronics > Microcontrollers

Copy & Write from/to Atmel AT27C256R70PU

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Hi All,

I've been handed a problem at work.
Back in the day, one of the consultant engineers wrote a bunch of code for using  Atmel, I don't know the full story but for some reason he didn't leave source code for some of his projects, but we have master chips for everything. Never been a problem until now since all that stuff is obsolete and it's just the occasional repair/replace chip we need.

However our Atmel programmer has given up the ghost, off to Atmel for repair. In the meantime I've been tasked to make a couple of copies.
I know next to nothing about Atmel chips, but I just need to read from our master AT27C256R and write 3 or 4 copies.
Atmel quote ~$700.00 for a programmer, which I'm sure is just plain wrong.

I was wondering if one of the cheapo generic programmers would do, like :
I dont see the AT27C256R listed in the devices though.
I'd prefer something I can just put a dip chip into, there's no ISP headers on any of our gear.

Thanks in advance for any help or suggestions.

Not an exotic part. According to the datasheet it uses the standard 100us pulse at 6.5V+13V programming algorithm. Microchip's 27C256 is programmed the same way.

That particular programmer you link to mentions none of the 27C series devices, so I doubt it's suitable for this purpose. Someone else here asked for a 27C256 programmer before.

Refer to https://www.eevblog.com/forum/blog/eevblog-411-minipro-tl866-universal-programmer-review/

the minipro TL866 has the Atmel AT27C256R in it's list of supported devices

The chip is an EPROM, not a microcontroller, so none of the cheap and readily available AVR microcontroller programmers will support it.  It's also relatively complex to program compared to most modern microcontrollers (parallel address and data bus, high voltages, critical timing.)  $700 is pretty cheap for a "universal" programmer of the sort usually used to program these.  You could try http://www.ebay.com/itm/TOP853-USB-Universal-Programmer-EPROM-MCU-GAL-PIC-abw-/140922513564?pt=LH_DefaultDomain_0&hash=item20cfa2e89c or similar.
(Don't you have a device programmer for the chip, even if you don't have the source code?)
(This is also an "odd" part to be associated with Atmel Microcontrollers, except perhaps for their legacy 8051 chips.)

It's from the 27Cxx series, not uncommon to anyone who has worked in embedded systems for some time.


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