Hi Neil

We don't get that, we see what looks like a HEX file back from the chip. We have also tried different manufacturers of the GALs too, we get different check sums, but I suppose that's because the different chips have different algorithm's to program them.

Many thanks

Thank you for getting back to me. How would you know whether a device has had the security bits enabled using a dataman programmer?

Unfortunately our company still uses GAL chips in some telemetry equipment. The chips are being used in an I/O card in between the processor card and the main I/O chips. The problem we have is that something happens with a particular GAL chip, it seems to have failed by stopping the CPU from booting...