I have followed NI Static DIO Register-Level Programmer Manual for NI 6509, 651x, 6520, 6521, and 6528 Devices to initialize our NI6528. But the 0x0000AEAE instruction has caused "low-1M" bit flag set in both region 0 (4K) and 1 (8K) as seen by "lspci -xxxvv". Without that offending instruction, I do not see the "low-1M" bit flag set, but after initialization, I wrote data to, and saw nothing coming out of the output ports.
An example code thread would be very helpful.