Multiregion N64 problem

[Bobzee]

Hi all, been happily modding my n64 recently but now i'm stuck.
I've removed the pif chip from a pal n64 and connected it up to an ntsc n64 as shown in this thread:
http://forums.benheck.com/viewtopic.php ... 58ca616945
I am able to get the console to boot pal and ntsc carts, but it freezes up after about 2-4 seconds.
Very rarely, when it doesnt freeze up so quickly, i get the "No controller connected" message, or if the game loads, the controls lag really bad.
The 3.3v, 12v and 5v supplies are all stable, and i've checked there are no short circuits on the pif chips.
My multimeter doesn't do current but i don't see why any extra current would be drawn.

Any ideas or inspiration?

[Bobzee]

Haha! After much head-scratching i've got it to boot pal and ntsc carts without freezing.
For some reason, having pin 15 of both pif's connected to the mainboard is causing the problem.
I fitted a switch to toggle between them and all is well, unless a controller is plugged into port 2.
Probably going to need to switch another 3 pins to get all 4 ports working.
I'll post some pics if anyone is interested, i just piggybacked the pal pif on top of the ntsc one to save from having too much spaghetti in the console.
Nightmare getting access to the solder pads and pins though...