Hi Karim,

The blowit source code I looked at had an array of 2048 bytes to hold the code. Thus for a 4051 the programmer code would have to be modified to be large enough.

I suspect that the 4051 and 2051 use the same programming algorithm. You should read both datasheets to verify that.

That's probably all that you need to do. From the code comments, it's a quick and dirty piece of code for erase and program only, so I suspect it's not looking at any chip ID to verify that it's programming the right chip. (And thinking about that, it probably isn't verifying that it programmed it correctly.)

You would be better off with an ISP derivative: that way you don't have to worry about whether it's the programmer hardware, the programmer software, the actual programming, the programmed code or the project hardware that's causing your project not to work. Reducing variables reduces headaches.

By the way, the URL you included worked fine. It will, as long as you include the "http://".

Dennis