From owner-freebsd-questions Thu Apr 25 15:02:41 1996 Return-Path: owner-questions Received: (from root@localhost) by freefall.freebsd.org (8.7.3/8.7.3) id PAA13851 for questions-outgoing; Thu, 25 Apr 1996 15:02:41 -0700 (PDT) Received: from mail.think.com (Mail1.Think.COM [131.239.33.245]) by freefall.freebsd.org (8.7.3/8.7.3) with SMTP id PAA13845 for ; Thu, 25 Apr 1996 15:02:35 -0700 (PDT) Received: from Early-Bird-1.Think.COM by mail.think.com; Thu, 25 Apr 96 18:01:10 -0400 Received: from compound.Think.COM (fergus-27.dialup.cfa.org) by Early-Bird.Think.COM; Thu, 25 Apr 96 18:01:03 EDT Received: (from alk@localhost) by compound.Think.COM (8.7.5/8.7.3) id SAA03545; Thu, 25 Apr 1996 18:00:50 -0500 (CDT) Date: Thu, 25 Apr 1996 18:00:50 -0500 (CDT) Message-Id: <199604252300.SAA03545@compound.Think.COM> From: Tony Kimball To: terry@lambert.org Cc: questions@freebsd.org In-Reply-To: <199604252134.OAA25496@phaeton.artisoft.com> (message from Terry Lambert on Thu, 25 Apr 1996 14:34:04 -0700 (MST)) Subject: Re: bounce buffers Sender: owner-questions@freebsd.org X-Loop: FreeBSD.org Precedence: bulk Bounce buffers are required for 24 bit (ISA) bus master DMA to addresses over 16M. Only bus-mastering DMA, then? I'm quite vague on PC hardware, so correct my errors, please, but is there not a slave mode of DMA operation as well? Are bounce buffers required for slave mode?