[Elecraft] K2 with MacOS Classic

[Jack Brindle]

Let's not get into an argument on this... The latest spec is RS-232F,  
I believe. It now contains definitions for the DB25 and RJ-45  
connectors and maybe a few others. At over $100 for the spec, I don't  
have a strong desire to find out what else. Amazingly, it does not  
contain definitions for the commonly-used DE9 connector.

In D-shell connectors, the second letter specifies the size of the  
connector shell. There are many pinouts and arrangements used in B- 
sized shells, including Sun's video connections. The 15 pin connector  
uses an A shell, while the 9 an E shell. Now that we note this, I  
seriously doubt that we have any chance of convincing the world to  
use the correct nomenclature, are we...

And lastly, the Macintosh has never used RS-232 levels on its serial  
ports. Instead, they (we for a while) used RS422 levels, centered  
around zero volts. This allowed the creation of AppleTalk and its  
predecessor, AppleBus. It also allowed interfacing to the outside  
world and the commonly  used RS-232 levels. All have now been phased  
out and Apple uses Ethernet and USB on its systems.

OK, so now back to our regularly scheduled radio  
discussions...   ;-) :-) :-)


On Nov 22, 2005, at 6:28 PM, Don Wilhelm wrote:

> Just a tid-bit of information here (useless though it may be) - the  
> RS232
> standard does specify a connector - and in fact it is the DB-25  
> connector.
> Other connector configurations may carry the RS-232 signal levels and
> signalling protocol, and can come in many different flavors.  The  
> one we
> seem to be most concerned with is the DB-9 (more properly a DE-9)  
> connector
> which has become the de-facto 'standard' on IBM compatible PCs.   
> The Apple
> world has used mini-din connectors for most everything (including  
> RS-232
> level signals) for a long time.
>
> 73,
> Don W3FPR
>
>> -----Original Message-----
>>
>>
>> Actually RS-232 refers to the signal names and levels, although a
>> DE-9 (Cannon nomenclature) connector is often used (sometimes it is a
>> DB-25, particularly for modems).
>>
>> A good place to find information related to Macintosh radio
>> applications is the "ham-mac" mailing list <http://mailman.qth.net/
>> mailman/listinfo/ham-mac>.
>>
>
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-Jack Brindle, W6FB
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