T48 programmer help

[Arcade-Projects]

I apologize for being so new to using this. It worked perfect for fixing som MC27C1000 EPROMs but when I tried a D27C512D I kept getting a bad #28 pin; I assumed it was a software thing, but the write process only goes to 12.5% then fails. Is this a user error or a bad chip ? I’m sure I’m missing something.

XGecu / D27C512D EPROM

After more research, my programmer doesn't have an external port for power. I'm assuming this can't produce enough voltage to program this chip

Source: https://www.arcade-projects.com/threads ... elp.28355/