HP41 TULIP4041 update

[MeindertKuipers]

Good work Sylvian, thanks for sharing. Just a few remarks from me:
- The trace listing shows FI as high all the time. You probably have jumper JP2 open. If you close this you can trace the FI line, and you see activity there when there is HP-IL traffic or interrupts from TIME
- In the IL Scope you see double the amount of RFC frames. These are real frames, the handling of these frames in the PILBox emulation needs to be fixed.

Next items for you to test: HP82143 printing and IR printing, Extended Memory and adding the HP-IL registers to the trace (command 'tracer ilregs'). Note that the registers are shown only when there is a change.

The ILScope trace is a different format because it is mixed with PILBox serial traffic (can be switched off), and I can never remember if the IL frames in capitals are in or out, so I used the symbols > for out and < for in.