Date: Sat, 27 Apr 96 14:05:51 PST From: "Brett Glass" <Brett_Glass@ccgate.infoworld.com> To: "Rodney W. Grimes" <rgrimes@GndRsh.aac.dev.com>, dwhite@resnet.uoregon.edu Cc: dshin@ponder.csci.unt.edu, freebsd-questions@freebsd.org, freebsd-hardware@freebsd.org Subject: Re: Boot floppy problem with Intel Atlantis motherboard (Mac Message-ID: <9603278306.AA830640135@ccgate.infoworld.com>
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> No, it't the IBM design idiots 8514 vs COM4 scew over because all the > world is going to become PS/2 compliant. (PS/2 compliant means thall > shall decode 16 bits of I/O address for serial and video ports, > independent of weither this is ISA, MCA or on the motherboard.) > Actually, the "idiots" were the people at AST and Quadram who created serial ports called "COM3" and "COM4" with interrupts that overlapped COM1 and COM2 (the only ports that are actually standard) and port addresses that were designated as "reserved" by the designers. When IBM assigned standard port addresses for COM3, COM4, etc., they used a range of 16-bit ports that did not conflict with anything. But the cloners ignored this, causing problems that have lasted to this day.
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