Difference between revisions of "CPCI RS232 Interface"
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== Technical specs == | == Technical specs == | ||
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| + | Contains a single 25pin DSUB connector, a MC6850 chip (ACIA), MAX 232 voltage converter, 74LS138 and 74LS85 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). | ||
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| + | F8DCh CPCI Serial Interface MC6850 Control/Status Register (R/W) | ||
| + | F8DDh CPCI Serial Interface MC6850 Data Register (R/W) | ||
* Based around: MC6850, and MAX232 | * Based around: MC6850, and MAX232 | ||
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* [[Media:MC6850.pdf|Motorola MC6850 datasheet]] | * [[Media:MC6850.pdf|Motorola MC6850 datasheet]] | ||
* [[Media:Max232.pdf|MAX232 datasheet]] | * [[Media:Max232.pdf|MAX232 datasheet]] | ||
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== How to build a RS232 interface (German) == | == How to build a RS232 interface (German) == | ||
Revision as of 16:29, 3 January 2010
This RS232 interface was published as a DIY project in a special edition of the the German magazine: CPC Schneider International (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.
Technical specs
Contains a single 25pin DSUB connector, a MC6850 chip (ACIA), MAX 232 voltage converter, 74LS138 and 74LS85 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).
F8DCh CPCI Serial Interface MC6850 Control/Status Register (R/W) F8DDh CPCI Serial Interface MC6850 Data Register (R/W)
- Based around: MC6850, and MAX232
- Ports used:
- F8DC - Control register
- F8DD - Data register.
How to build a RS232 interface (German)
- RS232
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