TDS2020BYN stacking standby power board

This piggyback daughter board:

l fits directly on a TDS2020F computer (or as a third level above a TDS2020F and TDS2020DV pair because of its long pins)

l has its lithium battery is protected by a blocking diode on the TDS2020F

l has 33k limiting and 10M shunt resistors

l does not maintain any applications program - it connects to VBATT to keep alive the clock chip and RAM in the 32-pin socket.

When a TDS2020CM2 PCMCIA adapter is sandwiched above the TDS2020F, use a TDS2020BYD not a TDS2020BYN. This external standby power board can be used by just 2 wires to pins VBATT (pin z3) and GND (pin c32).

Picture for illustrative purposes only