[Shop-talk] Notching rafters for purlins?

[Obaa]

Hi all,
I have a set of 2x6 rafters (25) that I need to notch for some 2x2 purlins.  There are 6 purlins per rafter, so a lot of notching....
The only way I'm aware of to make these notches is to saw a number of closely spaced slots, then knock out the "fingers", and use a chisel to clean up the groove.
Is there a better way to do this, given the number of notches required?  I have just basic hand and power tools (circ saw, jigsaw, router); no table saw or anything else like that.  Any ideas appreciated!