Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Thu, 12 Apr 2001 06:11:16 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Thu, 12 Apr 2001 06:10:56 -0400 Received: from delta.ds2.pg.gda.pl ([213.192.72.1]:21639 "EHLO delta.ds2.pg.gda.pl") by vger.kernel.org with ESMTP id ; Thu, 12 Apr 2001 06:10:46 -0400 Date: Thu, 12 Apr 2001 11:51:07 +0200 (MET DST) From: "Maciej W. Rozycki" To: Jamie Lokier cc: Zdenek Kabelac , linux-kernel@vger.kernel.org Subject: Re: No 100 HZ timer ! In-Reply-To: <20010411181310.C23974@pcep-jamie.cern.ch> Message-ID: Organization: Technical University of Gdansk MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 11 Apr 2001, Jamie Lokier wrote: > Think of the original 64k and 256k VGA cards. I think some of those > didn't have an irq, but did have a way to read the progress of the > raster, which you could PLL to using timer interrupts. Some video games > still look fine at 320x200 :-) The *original* VGA, i.e. the PS/2 one, did have an IRQ, IIRC (according to docs -- I haven't ever seen one). Cheap clones might have lacked it, though. Then there is workstation (non-PC) hardware from early '90s which we run on and which uses an IRQ-driven interface to graphics adapters -- not only for vsync. -- + Maciej W. Rozycki, Technical University of Gdansk, Poland + +--------------------------------------------------------------+ + e-mail: macro@ds2.pg.gda.pl, PGP key available + - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/