From owner-freebsd-chat Mon Aug 10 16:39:16 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id QAA19971 for freebsd-chat-outgoing; Mon, 10 Aug 1998 16:39:16 -0700 (PDT) (envelope-from owner-freebsd-chat@FreeBSD.ORG) Received: from allegro.lemis.com (allegro.lemis.com [192.109.197.134]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id QAA19920 for ; Mon, 10 Aug 1998 16:39:10 -0700 (PDT) (envelope-from grog@freebie.lemis.com) Received: from freebie.lemis.com (freebie.lemis.com [192.109.197.137]) by allegro.lemis.com (8.9.1/8.9.0) with ESMTP id JAA11653; Tue, 11 Aug 1998 09:08:39 +0930 (CST) Received: (from grog@localhost) by freebie.lemis.com (8.9.1/8.9.0) id JAA20241; Tue, 11 Aug 1998 09:08:38 +0930 (CST) Message-ID: <19980811090838.D20188@freebie.lemis.com> Date: Tue, 11 Aug 1998 09:08:38 +0930 From: Greg Lehey To: aw1@stade.co.uk, freebsd-chat@FreeBSD.ORG Subject: Re: FreeBSD References: <19980809104012.P14475@freebie.lemis.com> <19980810083241.L11095@freebie.lemis.com> <19980810203516.B7341@stade.co.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 0.91.1i In-Reply-To: <19980810203516.B7341@stade.co.uk>; from Adrian Wontroba on Mon, Aug 10, 1998 at 08:35:16PM +0100 WWW-Home-Page: http://www.lemis.com/~grog Organization: LEMIS, PO Box 460, Echunga SA 5153, Australia Phone: +61-8-8388-8286 Fax: +61-8-8388-8725 Mobile: +61-41-739-7062 Sender: owner-freebsd-chat@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org On Monday, 10 August 1998 at 20:35:16 +0100, Adrian Wontroba wrote: > On Mon, Aug 10, 1998 at 08:32:41AM +0930, Greg Lehey wrote: >> Oh, sure, when you have multiple CPUs. I think we were talking about >> software multiplexing a physical system. > > It can be done - several ICL 2900 series mainframes concurrently ran > two different operating systems, with different underlying instruction > sets, on a single CPU (OCP). This allowed people to get rid of their old > hardware sooner. > > The software multiplexing was performed by the OCP microcode. Sure, that technique's not new. But it's not what IBM was using. Greg -- See complete headers for address and phone numbers finger grog@lemis.com for PGP public key To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-chat" in the body of the message