Path: utzoo!mnetor!uunet!husc6!bloom-beacon!mit-eddie!ll-xn!ames!pasteur!ucbvax!XX.LCS.MIT.EDU!ROMKEY From: ROMKEY@XX.LCS.MIT.EDU (John Romkey) Newsgroups: comp.protocols.tcp-ip.ibmpc Subject: Re: Western Digital board Message-ID: <12397216916.47.ROMKEY@XX.LCS.MIT.EDU> Date: 10 May 88 15:06:26 GMT References: <21523@amdcad.AMD.COM> Sender: daemon@ucbvax.BERKELEY.EDU Organization: The Internet Lines: 13 Western Digital's claims, re: speed on an AT and ease of configuration, are basically correct. The AT's DMA controller runs slower than the PC's, because (I think) it loses some cycles since you've got a second controller cascaded with it. The 286 string instructions are a lot faster. Plus, since it's memory mapped, they're not JUST 286 string instructions; the whole 80x86 line has them. On the other hand, it's also difficult to deal with mapping in memory when you've got who knows what random EMS memory and EGA's and BIOS extensions and whatever floating around in your physical address space. - john -------