Date: Sat, 16 May 1998 11:09:38 -0400 (EDT) From: "Matthew N. Dodd" <winter@jurai.net> To: Duncan Barclay <dmlb@ragnet.demon.co.uk> Cc: freebsd-hardware@FreeBSD.ORG Subject: RE: interesting stuff Message-ID: <Pine.BSF.3.96.980516110452.17033x-100000@sasami.jurai.net> In-Reply-To: <XFMail.980516090704.dmlb@computer.my.domain>
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On Sat, 16 May 1998, Duncan Barclay wrote: > It's usually easier to do these on the parallel port (god knows how many > phase locked loops I've programmed down that!). Agreed. Hacking the parallel port gets quick and dirty results. > One "problem" with the I2C is that it is not a TTL compatible bus, so a > bit of hardware is need to convert the logic levels. > > Secondly, the framing on the I2C bus doesn't lend itself well to UART > style parity/start/stop bits. One problem with the parallel port is that it won't be sufficient for remote sites that want temperature monitoring hardware hanging off a serial port. I think any less than simple design (I can get a $99 I2C to RS-232 dongle from a number of different places.) implies multiple I2C busses, a small PIC or processor and other stuff. I'm actually talking with the guys that make the HLT about doing this project. > I would suggest that a parallel port driver be plugged into the ppbus > framework. It owuld be something I would find useful at work! Heh. Great for hacking value but remote terminal servers only speak LPD over their parallel ports (if they even have any). /* Matthew N. Dodd | A memory retaining a love you had for life winter@jurai.net | As cruel as it seems nothing ever seems to http://www.jurai.net/~winter | go right - FLA M 3.1:53 */ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message
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