No idea... my PCBs were developed by taking everything but the asic communication logic from an original cart, then when I tried it without the 100Ohm resistor it didn't work. I assume it is a pull up to signal something to the motherboard.Do you have any idea why the J1-21 pullup isn't connected on the Lydz boards? Your pinout documentation and the assembly guide for the carts makes it seem like at least a 100Ohm pullup is required for the cart to boot properly, but the Lydz carts I've seen never have this pulled up (it's not connected to anything at all, in fact). And when I add the pullup on my cart, it changes the behavior (although it still doesn't give me any meaningful output, heh).
Edit: I think the Microchip site uses some script to give you the download for WinCUPL, disable any popup blocker or ad-blocking you may have running.
It is not great, but the only remaining tool for GAL/PAL programming.