Ensure Pin 1 of your chip matches the notch on the ZIF socket.
The is widely regarded by reviewers as a "Swiss army knife" for electronics hobbyists due to its massive device support and budget-friendly price . However, it is an older model that has been largely replaced by the TL866II Plus and T48 . Software Features and Performance Minipro Tl866cs Universal Programmer Software --BEST
A list of the (SOP8, PLCC44, etc.) every owner should have. Ensure Pin 1 of your chip matches the