There are multiple input/output options:
- Both: counts as both input AND output.
- Input: Allow items to enter the machine here, if the machine automatically pulls in it'll try to pull on this side
- Output: allows extraction of the machine output on this side, if the machine auto-ejects it will try to output on this side
- Disabled: Don't allow input or output on this side
Each side has also a priority, it'll go try to input/output automatically on the side with the highest priority first. Possible priorities (from high to low):
- Very High
- Very Low