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Problem writing to M27C4001 with Epp-3 ?

Discussion in 'Electronic Basics' started by Graeme Hinchliffe, Dec 20, 2003.

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  1. Hiya
    Sorry for the cross post, I am unsure which group to post this question

    I have recently bought myself an EPP-3 USB eprom programmer for some
    hobby work. Unit seems sound enough and I have successfuly written to
    M27C1001, 27C040, and M27C801 devices. However I also won a batch of
    M27C4001 devices on ebay. If I try to write to these the process works
    for a breif period and stops with a failure, even if I try to write back a
    blank image to the device. When I have written partial data to a device
    if I read it back in, the data seems to stop at $30000 on each of the

    Is this a bug with the EPP-3 unit/software? I have tried specifying the
    device as 27C040 which gives the same behaviour. Also erasing the devices
    and then trying to use them has no different effect.

    I am hopping there is some obvious solution to this as 12 27C4001 for £24
    seemed like a good deal (all unused).

    Thanks in advance

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