WARNING: This information is provided "as is" with no warranty. Use at your own risk!
This site is NOT affiliated with PB.

PB400/PB401T Other Upgrade Information

Warning Only authorized service personnel should upgrade the system. Anyone who wants to upgrade the system herself/himself should know about the dangers of ESD (Electro-Static Discharge) and the necessary precautions. Unknowingly zapping the components of the computer will void the warranty.

Speaker

Use an 8 ohm, 1/2 watt computer speaker. Set jumper J29 to short pins 2 and 3. Then connect the speaker to J28, with the positive terminal of the speaker connected to pin 4, and the ground connected to pin 1. 

Battery

This computer can use a 3.6 volt Lithium battery. To install the external battery, remove the cap on jumper J8. Then connect the battery to connector J7. The positive terminal of the battery connects to pin 1, and the ground terminal is connected to pin 4.