Quote Originally Posted by dave w View Post
Are the chips correctly orientated into the programmer?

Are the chips fully erased?

Are you able to successfully program any other type of chip?

I'm thinking the programmer would likely provide an error code when it fails to program a chip?

dave w
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 be.

I've used Pocket Programmer 2 and an APU1 which the "half moon" faces the same direction but take notice of which pins are vacant in the pic below. My question to TL866II owners if this would apply to the TL866II as well???