EPM7128ELC84 fab/rev differences

So I've isolated the 7128, removing it from all connected devices like the DSP, ROM, etc.. and simply clocking it with a signal generator running at 100Khz to eliminate timing/speed problems or conflicts and proved this works on an older style chip. From what I learned the input clock is divided down and output to an output LED to provide a simple heartbeat to indicate it's running and newer date codes show no activity. So back on the possibility of improper programming. This isn't the 'S" JTAG version, but old school externally programmed by our vendor using a 3rd party programmer and a .pof file that's worked for many years. This programmer was proved out and working on chips era 1998, but nothing manufactured recently seems to work.