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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)