TULIP4041 Startup Question

[MeindertKuipers]

No worries, FI is an active low signal, meaning it is mostly high when not active. The 'noise' is possibly the activity on the FI line from HP-IL. When the HP41 is powered down the FI line will go down.
If you see the messages then the HP-IL emulation works, but no device is connected, and it means that there is FI activity, but you will not see this in the tracer, JP2 does not matter in this case. This is a bug I need to check out.
When you do a DIR now do you see NO DRIVE ot TRANSMIT ERR?? I am pretty sure you willsee NO DRIVE.
It is now time to connect pyILPer and check what happens. Also enable the PILBox tracing with the tracer pilbox command to verify if you get the 'serial' frames.