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This test fails at 9600 baud at the beginning of the transfer. Although the message on is stating sending file, the Z88 has already aborted command.
The assumtion that the USB Serial Cables are at fault is incorrect.
I will test the other Z88 popdown versions on the Windows machine next week with OZ 2.2.
I suspect that the Z88's timing is currently working outside the standard limits of 9600 baud which the Keyspan Serial Cable is able to seeI was unaware of the test program in Z88 menu. I will run this next week and update these results accordingly.