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