CScotty

Hi Karoly, Thanks. That did throw more light on it. It's not resolving printf. I've read the manual, the wiki and looked in the SDCC instalation folder and in particular the device library folders and as far as I can tell it's not defined anywhere that I can find. Where is it?

Looks like a have a party of one here! I ran make from the command line and got a bit more info. This is nothing to do with unresolved symbols but a parser error. It doesn't seem to like chr1 line1 of a file, possibly the linker script as it was the last one loaded.

Since writing the above my understanding of the process has improved (I think) but I'm no closer to a soluton. It seems that SDCC uses ASLINK ( and not gplink as I had thought). I alao see that the linker scripts are supplied not generated but have no bearing on this in any case. ASLINK does not seem to have any command line options that will give me more info.

Unresolved External? Assertion failed! sym != NULL

Here is the image. I guess I can only attach one item to a post.

Here is the image. I gues I can only attach one item to a post.

Here is the image. I gues I can only attached one item to a post.

Odd Looking Plots