Parts and FRUs
* The sticker on a spare assembly I've checked says: Assy No: 90X6878. And the small PCB has 90X6876 etched to it.
** Model 65 SX uses a pair of Dallas chips to implement the RTC/CMOS and NVRAM functionality. Each of these chips has its own internal battery, therefore a standalone battery isn't needed. The unit uses a "stripped down" version of the assembly, with no battery contacts and only a two-wire connection for the speaker.
Battery Type and Correct Orientation
Clear a Power-On Password
Model 50, 60, 70, 80 Override Jumper
With assembly shorted, power-on computer. This erases power-on password. Remove short after POST is finished.
When installed the jumper shorts the Clear POP pin to ground.
Removing the Assembly
Models 60, 65 SX and 80
To remove the assembly, simply slide it towards the opened side of the case.
Models 50, 50Z and 70
To remove the assembly, you have to first push the retaining clip at the bottom of the assembly inwards. If you have trouble finding the clip, refer to the following picture for its location (right over the orange crystal holder):
While pressing it in, push or pull the assembly up, away from the base of the machine. Please note, that in Models 50, 70 Type 1 and 70 25 MHz the assembly is also being held in by the card edge connector on the planar board.
Battery/Speaker Connector Pinout
Pin Header Connector (Models 50Z, 60, 70 Type 2 and 80)
6-pin header on the battery/speaker assembly PCB.
Card-Edge Connector (Models 50, 70 Type 1, 70 25 MHz)
6-pin card-edge connector on the planar board.