Hi All,
I'm totally new to these forums, so please be gentle with me
I am trying to write data to an eprom but I am not having much success. I have done this successfully in the past with my Genius NSP programmer.
I tried a couple of days ago and everything was good. I was writing a 16kb file to a 27C256 eprom and it all worked fine. Then I wanted to write something else, so I erased it in my UV eraser and now the programmer fails straight away when I try to write even though the software tells me it is blank. I have tried a couple of other eproms I have and I get the same results. I thought it may be bad eproms. So I got a couple more from eBay - this time 27C128 as I am only writing 16kb. However, these eproms will not erase. If I read the data off of them, I see 256bytes of 0xFF, then 256bytes of 0x00. This pattern repeats.
So I have 2 problems.
1) I cannot write anything as it fails straight away
2) I cannot erase my 27C128's
Can anyone offer any ideas?
Thanks
Bill.
I'm totally new to these forums, so please be gentle with me
I am trying to write data to an eprom but I am not having much success. I have done this successfully in the past with my Genius NSP programmer.
I tried a couple of days ago and everything was good. I was writing a 16kb file to a 27C256 eprom and it all worked fine. Then I wanted to write something else, so I erased it in my UV eraser and now the programmer fails straight away when I try to write even though the software tells me it is blank. I have tried a couple of other eproms I have and I get the same results. I thought it may be bad eproms. So I got a couple more from eBay - this time 27C128 as I am only writing 16kb. However, these eproms will not erase. If I read the data off of them, I see 256bytes of 0xFF, then 256bytes of 0x00. This pattern repeats.
So I have 2 problems.
1) I cannot write anything as it fails straight away
2) I cannot erase my 27C128's
Can anyone offer any ideas?
Thanks
Bill.