Now I'm trying some VFS commands to see if these have the effect of stopping our serial port dialogue. The first thing to note that simply selecting non-mounting-VFS with *LVFS (ie. equivalent to *FADFS) doesn't cut off the serial channel, because the next serial-based command has gone through, and we are now seeing a freeze-frame of picture number 22000.

I have then used the VFS FCODE command to send function code D1 to the player, which switches on the picture number display. As this is done with *FCODE, the command is sent via the SCSI bus, so now we need to see if we can still send serial commands.

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