Date: Tue, 11 Aug 1998 09:08:38 +0930 From: Greg Lehey <grog@lemis.com> To: aw1@stade.co.uk, freebsd-chat@FreeBSD.ORG Subject: Re: FreeBSD Message-ID: <19980811090838.D20188@freebie.lemis.com> In-Reply-To: <19980810203516.B7341@stade.co.uk>; from Adrian Wontroba on Mon, Aug 10, 1998 at 08:35:16PM %2B0100 References: <19980809104012.P14475@freebie.lemis.com> <Pine.3.89.9808091311.A6903-0100000@netcom3> <19980810083241.L11095@freebie.lemis.com> <19980810203516.B7341@stade.co.uk>
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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
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