HP41CX "PRA" Misbehaving on TULIP

[rocket.scientist]

Thanks for the responses. I re-checked "Enable IDY frames" in PYilper and see the "PILBox mode changed to COFI / Controller OFF with IDY" status in the console interface.

I've tried this PRA scenario both ways with little change in behavior. I'm really starting to believe either 1) I am missing something obvious in my virtual setup, or 2) I messed something devious up when I built my TULIP. This seems specific to my TULIP build since physical HPIL devices work perfectly, and nobody else is reporting these issues.

I did find U5 behaved oddly when I put a scope on it. It wasn't "not" working, but still odd. For now I have JP2 pulled and U5 pin 3 lifted. Per the schematic this takes the U5 logic out of the picture. I have ordered replacements.

I can't see where monitoring FI is critical to the TULIP HPIL function, but I'll ask to be sure. Is FI monitoring important here?