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.
Uses a Z80 PIO chip to control the HD146818 RTC chip via port A. Do not use Port A as this will affect the RTC operation.
FBE0h Dk'tronics Real Time Clock - [[Z80 PIO]] Port A Data ([[PC compatible RTC chip|HD146818P]] RTC Data bus)
FBE1h Dk'tronics Real Time Clock - [[Z80 PIO]] Port B Data , used for external control (General Purpose 8bit I/O Port)
FBE2h Dk'tronics Real Time Clock - [[Z80 PIO]] Port A Control
FBE3h Dk'tronics Real Time Clock - [[Z80 PIO]] Port B Control
FBE8h Dk'tronics Real Time Clock - "Control port for RTC chip (4bit latch" ) '''(details unknown)''' PIO Port A seems B is connected directly to be a standard 9-way connector on the plain RTC Data Bus, there should be also RTC Read and Write signals, which are maybe found in left of the '''(details unknown)''' port?interface.
== Software ==
== Reviews ==
* Reviewed in [[Amstrad Computer User]], July 1987, pages [[:Image:28 and 29.<gallery>Amstrad Computer User8707 028.jpg|28]] and [[:Image:Amstrad Computer User8707 029.jpg|29]].</gallery>
== Manuals ==
* [[Media:HD146818 datasheet.pdf|Hitachi HD146818 datasheet]]
* [[Media:Dktronics RTC Manual English.pdf|Dk'tronics RTC Manual (English)]]
* [[Media:Dktronics RTC Manual German.pdf|Dk'tronics RTC Manual (German)]]
* [[File:DktronicsRtcDriver.zip]] - none such?
[[Category:Peripherals]][[Category:Hardware]]