Date: Sat, 3 Dec 2005 15:48:25 +0100 From: Bernd Walter <ticso@cicely12.cicely.de> To: Peter Jeremy <PeterJeremy@optushome.com.au> Cc: cvs-src@FreeBSD.org, src-committers@FreeBSD.org, ticso@cicely.de, cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/dev/ic via6522reg.h Message-ID: <20051203144824.GB1040@cicely12.cicely.de> In-Reply-To: <20051203060516.GM32006@cirb503493.alcatel.com.au> References: <200512022236.jB2MaEI8090052@repoman.freebsd.org> <20051202233249.GA1299@freebie.xs4all.nl> <20051202234929.GI44012@cicely12.cicely.de> <20051203060516.GM32006@cirb503493.alcatel.com.au>
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On Sat, Dec 03, 2005 at 05:05:16PM +1100, Peter Jeremy wrote: > On Sat, 2005-Dec-03 00:49:30 +0100, Bernd Walter wrote: > >Mmmm - very interesting stuff - I used the 6522 as well as the 6821 > >on many self build 6502 and 68k based systems. > ... > >But honestly - I wasn't aware that a modern computer system still uses > >them. > > You means things like nec765, i8237, NS8250, i8259, MC146818? One of No - I especially mean the 6522. I grow up with C64 and C128 plus my first self build computers used them, so there's a special relation. > my work colleagues was surprised to discover that his brand new > computer still uses peripheral chips (embedded in ASICs) that were > designed before he was born... Isn't backward compatibility a > wonderful thing :-) Only sometimes, we all know the bad sides with e.g. 8259 in modern systems. > At least back then the IC vendors would publish programming details... And by moving them to ASICs also add more bugs... I'm always surprised if someone manages to write a nec765 driver that runs on all chips. PS: to complete your list you'll have to add the 6845, 8254 and 8042. Although I have to say that the 8042 lost it's feature as a general purpose IO controler many years ago. -- B.Walter BWCT http://www.bwct.de bernd@bwct.de info@bwct.de
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