Schneiderware Real Time Clock

The Schneiderware Real Time Clock is a battery-backed RTC, published by german magazine CPC Schneider International as part of their Schneiderware DIY series. The plain PCB, or the fully assembled board were also available via mail-order.

The ECB Bus connector of the board is intended to be plugged into the Schneiderware Basisplatine, but it could be also wired directly to the CPCs Expansion Port.

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The Real Time Clock is somewhat similar to the CPCI Real Time Clock released in a special issue of the same magazine, but not identical (the RTC chip has different pin-outs, and some of it's 4bit registers are working slightly different, the leap-year bits, for example).

Databoxes: UHR8000 RTC-RAM-driver in 10-1986 (hex listing, plus Hisoft Devpac source code) (caution this version uses incorrect I/O addresses FBE1-FBE3), UHRC000X RTC-ROM-driver in 4-1987 (this version uses correct I/O addresses FBE2-FBE4).

I/O Ports

Address (default)	Address (alternate)	Usage
FBE2h	BUGGED:FBE1h	Schneiderware RTC index/control (W)
FBE3h	BUGGED:FBE2h	Schneiderware RTC data 4bit (W)
FBE4h	BUGGED:FBE3h	Schneiderware RTC data 4bit (R)

Pictures

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  RTC Schematic

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  RTC/Echtzeituhr (component side)

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  RTC/Echtzeituhr (solder side)

Article

• Schneiderware #5 Echtzeituhr (Real Time Clock) (10/1986 pages 78-85, corrections on 12/1986 page 6 and 3/1987 page 9, 9/1987 page 9,

Datasheets

• M5832 Datasheet - Real time clock