From owner-freebsd-hackers Thu Feb 6 15:56:45 1997 Return-Path: Received: (from root@localhost) by freefall.freebsd.org (8.8.5/8.8.5) id PAA16085 for hackers-outgoing; Thu, 6 Feb 1997 15:56:45 -0800 (PST) Received: from who.cdrom.com (who.cdrom.com [204.216.27.3]) by freefall.freebsd.org (8.8.5/8.8.5) with ESMTP id PAA16071 for ; Thu, 6 Feb 1997 15:56:42 -0800 (PST) Received: from etinc.com (et-gw-fr1.etinc.com [204.141.244.98]) by who.cdrom.com (8.7.5/8.6.11) with ESMTP id PAA19385 for ; Thu, 6 Feb 1997 15:56:12 -0800 (PST) Received: from ntws (ntws.etinc.com [204.141.95.142]) by etinc.com (8.8.3/8.6.9) with SMTP id SAA03475; Thu, 6 Feb 1997 18:58:00 -0500 (EST) Message-Id: <3.0.32.19970206185434.00b95db0@etinc.com> X-Sender: dennis@etinc.com X-Mailer: Windows Eudora Pro Version 3.0 (32) Date: Thu, 06 Feb 1997 18:54:36 -0500 To: barry@Lustig.COM From: dennis Subject: Re: serial ports at 230k Cc: hackers@freebsd.org Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Sender: owner-hackers@freebsd.org X-Loop: FreeBSD.org Precedence: bulk At 02:55 PM 2/6/97 -0800, you wrote: >> > Does anyone have any experience with running 16550A's at 230kbps under >> FreeBSD? >> Yes, I know, the driver doesn't support it currently, but has >> anyone played? >> >> Yes. Take a standard serial card and replace the 1.8432MHz crystal with >> a 3.6864 MHz crystal.. ;-) Your "115200" speed will magically run at >> 230.4Kbps. >> >> I did it a long time ago, and if you're not one for soldering, I may have >> a pair of souped up cards if you're interested in buyin' em... or you can >> go get the Hayes ESP serial cards. >> > > I know that Zyxel (www.zyxel.com) sells a 2 serial 1 parallel add-on board (16550) with the clock selectable via jumper. It can do 1X, 2X, or 4X on the clock. Their ISDN TAs run the DTE at up to 460800, so they needed a solution. The RS-232 designers are turning in their graves about now...... db