At Frigging Last!
As of this morning it was sort of half working. I could run a small program in page 0 but couldn’t write to 0x100 without overwriting location 0. Lee Hart had suggested that I might have under-soldered some connections – a first for me. I went back and re-flowed all the connections and added solder wherever the plated thru holes weren’t visibly filled. That seems to have done the trick. I still may do a fresh build with a 4093 but I’ll have this running in the mean time and maybe i’ll experiment with 3mhz.