This Real Time Clock addon was published as a DIY project in a special edition of the the Germanmagazine: [[CPC Schneider InternationalSonderheft]](Sonderheft, issue #3-1986).
Like most other homecomputers of the era, the Amstrad CPC did not include a Real Time Clock. This project overcomes this limitation.
== Technical specs ==
1926..1989 Showa 1..64 (reign of japanese emperor Hirohito)
1989..today Heisei 1..today (reign of japanese emperor Akihito)
Ie. for Gregorian and Heisei calendars set LeapYearOffset=0, for Showa calendar set LeapYearOffset=1 (as suggested described in the CPC magazine). Anyways, the article recommends to use Gregorian calendar, ie. using year=86 for 1986, so, if the battery survived, it wrapped to year= Commercial versions == There are or have been other projects with an own Real Time Clock solution: * [[Dobbertin Real Time Clock]]* [[Dk'tronics Real Time Clock]]* [[SYMBiFACE II]]00 in year 2000.
== How to build a RTC interface (German) ==
Image:rtc s5.jpg|Page 5
Image:rtc s6.jpg|Page 6
File:NoPicture.gif|Schematic (the picture in the scanned article is too small to see anything)
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== Datasheets == * [[CategoryMedia:HardwareRTC-58321-58323 Datasheet.pdf|RTC-58321 Datasheet (Epson)]] == Notes == Also in 1986, the same magazine released another RTC ([[Schneiderware Real Time Clock]]) as part of the [[Schneiderware]] series (published in the normal issues, not in the special Sonderheft issues). Both solutions used similar but not identical 4bit RTC chips (the chips have different pin-outs, and some of the 4bit registers aren't exactly the same, for example, the leap-year bits are different). [[Category:Peripherals]] [[Category:DIY]]