[[Image:CPCAI-RS232interface.jpg|thumb|[[Octoate|Octoate's]] selfbuild self-built version of the CPCI RS232 interface]]
This [[RS232]] interface was published as a DIY project in a special edition of the the Germanmagazine: [[CPC Schneider InternationalSonderheft]] (Sonderheft, #3-1986) and also in a later issue. A terminal program, written by [[The Cranium]], for this serial interface was published in the last issue of the [[CPC Schneider International]] (12/1 1992/1993).
As the standard CPC series does not include a [[RS232]], this interface was very handy in order to communicate with other computers(eg. IBM PCs). A major drawback was the missing interrupt line which means that your programs have to poll the interface.
== Software ==
A terminal program, written by [[The Cranium]], for this serial interface was published in the last issue of the [[CPC Schneider International]] (12/1 1992/1993).
== Technical specs ==
* Based around: Contains a single 25pin DSUB connector, a MC6850chip (ACIA), MAX 232 voltage converter, 74LS138 and MAX23274LS85 address decoders, and a 4MHz oscillator with HEF 4060 clock divider, the clock divider connects to a mechanic switch, allowing to select between 19.2kHz and 38.4kHz. Four dip-switches allow to select the port addresses (FxDCh and FxDDh, with x=0..F, usually x=8).* Ports used: ** F8DC - F8DCh CPCI Serial Interface MC6850 Control register/Status Register (R/W)** F8DD - F8DDh CPCI Serial Interface MC6850 Data register.Register (R/W) * [[6850 ACIA chip]]
* [[Media:MC6850.pdf|Motorola MC6850 datasheet]]
* [[Media:Max232.pdf|MAX232 datasheet]]
== How to build a RS232 interface (German) ==
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[[Category:HardwarePeripherals]] [[Category:PeripheralsSerial interfaces]] [[Category:Serial interfacesCommunication Software]] [[Category:DIY]]