IMHO, the bit about the 1.5K output resistors not being needed is stated too laet and too weakly. It's not until you get to the debugging instructions that there's a fairly definitive statement that you should not install these if you're going to use the USBtinyISP as an ISP.
I'd change this:
to say:Now that you have a lot of practice with resistors, you can do the remaining 5 all at once. Place R10 (10K pullup resistor), R3, R4, R5 R6 and R7 (1.5K resistors for the USB connection, LEDs and output buffer)
This bit at the end:Now that you have a lot of practice with resistors, you can do the remaining 5 all at once. Place R10 (10K pullup resistor), R3, R5, and R6 (1.5K resistors for the USB connection and LEDs). Install jumpers for R4 and R7 (output buffer) unless you are going to use this as a dongle for the SpokePOV. If you plan on using this with the SpokePOV, then install 1.5K resistors for R4 and R7.
is too little too late. At this point, the resistors were long ago soldered in. This bit in the help:If you're not using the USBtiny to talk to a SpokePOV kit, and if you are using a target that has some load on the SCK and MOSI pins, you may need to replace R4 and R7 with jumpers as the 1.5K resistors will have trouble driving the load!
is much more accurate than the instructions.Do you need to 'jumper' the output 1.5K resistors? If you are not using the USBtinyISP for SpokePOV communication, this is recommended, especially with target chips that have something connected to the MISO/MOSI/SCK lines. Check the end of the soldering instructions for how to do this