Re: q:RS232 on a CBM64

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#186

From: Rob Janssen
Date: Thu, 16 Mar 1995 11:59

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In <3k6mn2$c0@chris.telip.uni-sb.de> chris@chris.telip.uni-sb.de (Chris Blum) writes:

>On 15 Mar 1995 03:46:07 GMT, John West (john@ucc.gu.uwa.edu.au)
>   wrote in <3k5ntv$m6p@styx.uwa.edu.au>:
>> Someone has already suggested using 2 inverters, but that is the ugly way
>                                        ^^^^^^^^^                  ^^^^^^^^
>> of doing it, and it won't let you talk to Macs.  The best way to do it is
>> to use the MAX232 or one of its friends - they convert 5V to +/-10, and
>> have 2 transmitters and 2 recievers.  One chip and 4 capacitors is all you 
>> need.

>So what do you think the MAX232 contains?  Or the 1488/89 chips in
>your PC? :-)

They not only invert, but also convert between TTL levels and the RS232
standard, which specifies positive and negative voltages to be used.
Using only an inverter will result in marginal levels, it may work or
may not work.

Rob
-- 
+------------------------------------+--------------------------------------+
| Rob Janssen         rob@knoware.nl | AMPRnet:   rob@pe1chl.ampr.org       |
| e-mail: pe1chl@wab-tis.rabobank.nl | AX.25 BBS: PE1CHL@PI8UTR.#UTR.NLD.EU |
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From: rob@pe1chl.ampr.org (Rob Janssen)
Subject: Re: q:RS232 on a CBM64
Reply-To: pe1chl@wab-tis.rabobank.nl
Organization: PE1CHL
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Date: Thu, 16 Mar 1995 11:59:20 GMT
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