HP41 TULIP4041 update

[Christoph Giesselink]

(10-28-2024 05:13 PM)Craig Bladow Wrote:  Something like:

Code:


  CDC Port 3 [HPIL] connected                                                   
  WARNING: No virtual HP-IL device connected, HP-IL loop may be open  
  HP-IL state changed to CONNECTED        
  PILBox mode changed to COFF / Controller OFF                                  
  PILBox mode changed to COFI / Controller OFF with IDY

Maybe interested why the PILBox mode is changed twice, 1st to COFF and then 2nd to COFI.

At PILBox Power On reset, the PILBox is in TDIS mode. This means all traffic on the HP-IL side is forwarded through the PILBox.

To notify the PILBox that the controller is on HP-IL side and we want to listen the frames on the USB side, we set the PILBox to COFF mode. But why not send COFI directly as initial frame? The COFI mode was introduced in PILBox firmware 1.6, before 1.6 the COFI command was ignored.

So, when you have a PILBox with firmware 1.4 and you send the COFI command directly as 1st command, the PILBox will still remain in TDIS mode. But when you first send COFF, every PILBox firmware will switch to the COFF mode. And when you then send COFI, all COFI capable firmware (1.6, 2.0, 2.1) will switch to COFI mode, all others remain in COFF mode.

On pyILPER and ILPilbox the COFI mode must be enabled by checkbox: pyILPER "Enable IDY frames" and Ilpilbox "IDY frames". At ILPer the COFI mode is enabled by default.