This depends on the modules of the CJTS you wish to utilize.
Graphic environments require more RAM than simpler records management systems do.
The monitor or CRT you choose needs to have a minimum .28 dot pitch. However, the CJTS will perform without any problems with a monitor of lesser size. Remember, the lower the dot pitch, the higher the resolution of the monitor. When viewing photographs and fingerprint images, this becomes more important. The printer is pretty much optional.