Changes

Reportedly: DK-Tronics RTC module used a Z80-PIO chip to address The battery is charged while the RTC itself as Port A of computer is switched on. The data will be retained for several months even if the PIO, with a 9-pin user i/o port as Port Bcomputer is not used during this time.

== I/O Ports == 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 - probably [[Z80-PIO ]] Port A Data ([[PC compatible RTC chip|HD146818P]] RTC Data bus) FBE1h Dk'tronics Real Time Clock - probably [[Z80-PIO ]] Port B Data , used for external control (General Purpose 8bit I/O Port) FBE2h Dk'tronics Real Time Clock - probably [[Z80-PIO ]] Port A Control FBE3h Dk'tronics Real Time Clock - probably [[Z80-PIO ]] Port B Control FBE8h Dk'tronics Real Time Clock - (unknown purpose) Not sure if above addresses are correct, Control port for example, A0 and A1 may be swapped...? 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 chip (4bit latch) '''(details unknown purpose)''' port? Port B is connected directly to a standard 9-way connector on the left of the interface.

* RSX.BAS (loader) and RSX.BIN (binary)- allows to change the time under BASIC, using following RSX commands** |SETTIME,yy%,mm%,dd%,dayofweek%,hour%,min%,sec%** |ASKTIME,@yy%,@mm%,@dd%,@dayofweek%,@hour%,@min%,@sec%** |POKERTC,index%,value%** |PEEKRTC,index%,@value%** |TIMEON,xpos%,ypos%,interval%** |TIMEOFF** |ALARMON,hour%,min%,sec%,flag%** |ALARMOFF* CLOCK.COM - installs the clock under CP/M+ (thereafter** Thereafter, it should be accessible with standard DATE command, and, it should add timestamps to files).** According to english manual, time is set by "CLOCK dd/mm/yy hh/mm/ss" rather than by using the DATE command (?)** Unknown how the timestamps are stored on disk? The normal AMSDOS filesystem / directory entries don't include timestamps.** According german manual, something is (the startup message?) "Datomat RTC und Cdos sind Warenzeichen von CMS International" (=Datomat RTC and Cdos are trademarks of CMS International)

Time stamps - P2DOS and CP/M Plus support time stamps'''Below method uses Directory Entries with User Number 31 for Timestamps. Which should be incompatible with AMSDOS, which are so it is probably NOT used in the CPC. On the CPC, the timestamps <might> be maybe stored in each fourth directory entrythe bootstrap sectors... ?'''

'''This method uses Directory Entries with User Number 31 for Timestamps. Which should be incompatible with AMSDOSTime stamps - P2DOS and CP/M Plus support time stamps, so it is probably NOT used in the CPC. On the CPC, the timestamps <might> be maybe which are stored in the bootstrap sectors..each fourth directory entry.?'''

== Review Photos ==

image:Amstrad Computer User8707 028.jpgimage:Amstrad Computer User8707 029.jpg