I am not able to load and run snapshots (.nas) on Nascom 1 emulation. With Nascom 2 emulation I have no problems.
Also can it be, the tape emulation for both drivers is not finish yet ? Because the tape control menu is not available.
I just took a quick look at the nascom drivers. The cassette port seems to be connected to a part (a 6402 uart) which is not hooked up in the driver code. It looks like this may require a bit more work to get cassette support working again.