I can't see what it is you attached in the last post. I neglected to mention that the APU1 won't program the "UV erase" EPROMs well at least from my experience. The PPII didn't have a problem with...

I'm not familiar with TL866II but to elaborate what dave w...this pic shows the EPROM orientation. Programmer has a legend on itself showing which direction the "half moon" on the EPROM suppose to...

Gonna share my experience...the EPROMs that have the little window that require good ole Hawaiian sunshine or a UV eraser to blank them, my APU1 will not program them, however my Pocket Programmer...