One other thing ... Does the 805x actually have "vectors" as some microprocessor/microcontrollers have? I thought they simply provide locations for jump instructions. The old 6502, by contrast had vector space, in that all that was needed to direct a reset or an interrupt was a target address, and not a complete instruction. I'm persuaded that that's the difference between an instruction and a vector. Am I wrong here?
more correctly "The old 6502, by contrast had vector address space"

0x03 for EI0 is more correctly called the "vector address", just like you for another processor might define the vector address as 0x03.

Erik