Contains following components: HD146818P ([[PC compatible RTC chip|PC-style RTC]]), a TMP[[Z80 PIO|Z84C20]]P ([[Z80 PIO]]), 74LS00 (Quad NAND), 74LS138 (demux), 74LS175 (4bit latch), 9pin male DSUB connector (used as an 8bit general-purpose I/O port), and a rechargeable 3.6V battery.
The battery is charged while the computer is switched on. The data will be retained for several months even if the computer is not used during this time.
FBE0h Dk'tronics Real Time Clock - [[Z80 PIO]] Port A Data ([[PC compatible RTC chip|HD146818P]] RTC Data bus)
PIO Port A seems to be the plain RTC Data Bus, there should be also RTC Read and Write signals, which are maybe found in the '''(details unknown)''' port?
The battery is charged while the computer is switched on. The data will be retained for several months even if the computer is not used during this time.
== Software ==