Computers

[liamfisher]

So, this is an oblique reference, but I think this is it.  You have to construct a computer.

P 235 CRB

A player character can create all the items presented in
this chapter as long as he has the skills, materials, tools, and
time needed to construct it. He must have a number of ranks
in the appropriate skill equal to the item level of the item to
be created. For weapons, armor, vehicles, and technological
equipment, the appropriate skill is Engineering. For magic
fusions and magic items, the appropriate skill is Mysticism.
For hybrid items, you must have the required ranks in both
Engineering and Mysticism. For drugs, medicinals, and
poisons, the skill can be either Life Science or Physical
Science. For any food or drink, the appropriate skill is Life
Science. For computers, you can use either Computers or
Engineering, and you can construct a computer with a tier
equal to half your ranks in the skill. For items that are not
considered any of these categories (such as most clothes,
tents, and so on) either Engineering or Mysticism can be
used. At a GM’s discretion, an appropriate Profession skill
can be used for a narrower range of items. For example, a
character with Profession (weaponsmith) might be able to
make technological, hybrid, and magic weapons and weapon
fusions, but no other items.

so tier 1 computer at 2 ranks of Engineering or Computer
2 at 4
3 at 6

So yeah, 2x tier is a shortcut for it.

and so on and so forth. 

And UPBs are 1 credit to 1 UPB per page 233 CRB