Whats the purpose of this jumper on this ieee-488 adapter?

[dave_m]

Anyone know if there is a seller in the states for these Adaptors? I swear I had more than one but after alot of searching this is the only one I have.

Try this place: https://store.go4retro.com/ieee-cable-adapter/

 

[Eudimorphodon]

It's a bit hidden on the lower right of the sheet 1 schematic for the 4040, but /IFC is connected to the 555 timer circuit and will reset the 4040. Whenever I reset the PET, it does recycle the 4040.

Huh, yeah, there it is. The GIF on Zimmers is pretty faded and it's definitely not obvious that's going to the same connector as the other lines.

So I'd agree, you definitely might see some issues if you didn't have that connected.

 

[VERAULT]

Try this place: https://store.go4retro.com/ieee-cable-adapter/

Thank you Dave!

 

[VERAULT]

So I realize I forgot to update this thread. I added the IFC jumper and tried using the drive on my PET 2001-8 and the drive works just fine. And it works just fine without the jumper in place.