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Miscellaneous 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, .5 watt computer speaker. Remove the jumper on pins 3-4 of the J40 (Jspk) connector. The Speaker will connect to pins 1 and 4. (pin 1= +5 volts, pin 4= speaker ground)
 

External Battery
Uses a 3.6 volt lithium battery. Remove the jumper on pins 3-4 of J31 (Jbte) battery connector. The battery connector is keyed and will only go in one way.
 
pin 1= +3 volts
pin 2= key
pin 3= on-board battery select
pin 4= ground