Pull up resistors?

On a previous build many moons ago I used 100 ohm, 1/8 watt pull up resistors to limit the current sink on the i/o terminals of electronic components.
All the documentation with the newer equipment today do not reference this. Is this still practiced and/or required?
Thanks in advance!

all depends on what your connecting and to what ..
they may well be already installed as part of the equipment ,

give some details , on what your attempting

I'm building a 4 axis desk top mill using steppers and drivers from Longs off of Ebay. The break out board is a DB25-1205 and I'm working on the limit/home switch wiring to complete the machine. The limit/home I/O's will be sinking the 5 volt source and just want to make sure there's "no smoke" at start up.

Hi

The manual for the BOB is the usual masterpiece of Chinglish, but from the pictures it appears there is already a limiting resistor in the circuit, albeit it is not labelled as such.





The main thing with this board is probably to use 2 power supplies, otherwise there is no proper isolation between computer and machine

regards