Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!seismo!ut-sally!utah-cs!utah-gr!thomas From: thomas@utah-gr.UUCP (Spencer W. Thomas) Newsgroups: comp.unix.wizards Subject: Re: BSD 4.2 minphys() < 64K Message-ID: <1871@utah-gr.UUCP> Date: Mon, 15-Dec-86 16:33:01 EST Article-I.D.: utah-gr.1871 Posted: Mon Dec 15 16:33:01 1986 Date-Received: Tue, 16-Dec-86 22:33:18 EST References: <376@wyszecki.munsell.UUCP> Reply-To: thomas@utah-gr.UUCP (Spencer W. Thomas) Organization: University of Utah CS Dept Lines: 11 In article <376@wyszecki.munsell.UUCP> jwf@munsell.UUCP (Jim Franklin) writes: >Does anyone know why minphys is still < 64 K? Has anyone successfully >increased this, or know why it can't be done? Thanks ... (Note: this applies to Vax/PDP-11 only.) physio() is often used to write to Unibus devices. These devices have a limit of 64k bytes transferred (due to a 16 bit count register). It has nothing to do with host memory size. -- =Spencer ({ihnp4,decvax}!utah-cs!thomas, thomas@utah-cs.ARPA)