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Thu, 23 Jul 2020 17:11:01 -0700 (PDT) X-DH-BACKEND: pdx1-sub0-mail-a40 From: Chris Hanson Message-Id: <382061AD-AD33-4D03-93A0-8A02B4CBE31A@eschatologist.net> Content-Type: multipart/alternative; boundary="Apple-Mail=_0CDDEC5B-DF74-47B2-81F4-2DBB1674BD9D" Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.120.23.2.1\)) Date: Thu, 23 Jul 2020 17:10:59 -0700 In-Reply-To: To: Henry Bent References: <20200717180831.5D4AB43F88@lignose.oclsc.org> <20200717195358.GA14847@minnie.tuhs.org> <20200717195718.GM18565@mcvoy.com> <77c0536b-87b8-44dd-96fd-76d8ceba30f2@localhost> <2135afdb-db52-05d2-9af6-24ad36367db3@tnetconsulting.net> <40a70393-894a-4b21-8678-a71bbca4aa69@localhost> <8e7efd45-a84e-cf20-9d30-8222357596a3@tnetconsulting.net> <202007200847.06K8l8DF026646@freefriends.org> X-Mailer: Apple Mail (2.3608.120.23.2.1) X-VR-OUT-STATUS: OK X-VR-OUT-SCORE: -100 X-VR-OUT-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgeduiedrhedvgddvlecutefuodetggdotefrodftvfcurfhrohhfihhlvgemucggtfgfnhhsuhgsshgtrhhisggvpdfftffgtefojffquffvnecuuegrihhlohhuthemuceftddtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenucfjughrpefhkfgtggfuffgjvfhfofesrgdtmherhhdtvdenucfhrhhomhepvehhrhhishcujfgrnhhsohhnuceotghmhhgrnhhsohhnsegvshgthhgrthholhhoghhishhtrdhnvghtqeenucggtffrrghtthgvrhhnpeduvedvuefgudfhkeevvddtudfftdfgffejvefglefhiedtgeevjeevjedvffdvteenucfkphepjeeirdduvdeirdduudefrddutdelnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehmohguvgepshhmthhppdhhvghloheplgdutddrtddruddrvddthegnpdhinhgvthepjeeirdduvdeirdduudefrddutdelpdhrvghtuhhrnhdqphgrthhhpeevhhhrihhsucfjrghnshhonhcuoegtmhhhrghnshhonhesvghstghhrghtohhlohhgihhsthdrnhgvtheqpdhmrghilhhfrhhomheptghmhhgrnhhsohhnsegvshgthhgrthholhhoghhishhtrdhnvghtpdhnrhgtphhtthhopehtuhhhshesthhuhhhsrdhorhhg Subject: Re: [TUHS] A/UX [was Linux is on-topic] X-BeenThere: tuhs@minnie.tuhs.org X-Mailman-Version: 2.1.26 Precedence: list List-Id: The Unix Heritage Society mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: The Eunuchs Hysterical Society Errors-To: tuhs-bounces@minnie.tuhs.org Sender: "TUHS" --Apple-Mail=_0CDDEC5B-DF74-47B2-81F4-2DBB1674BD9D Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii On Jul 21, 2020, at 9:26 PM, Henry Bent wrote: >=20 > That was always really funny to me. Your machine boots MacOS, = presumably because it was easier to let it deal with hardware = initialization than to rewrite it This is actually because the Mac OS is already in the middle of booting, = because big chunks of it were ROM-resident. The ROM didn't just exist as = a bootstrap loader for any OS; it was a subset of the OS that just = loaded more of itself, replaced parts of itself, etc. This only ended with the adoption of Open Firmware by the "New World" = PCI-based Power Macintosh series. Even there, the second-stage bootstrap = invoked by Open Firmware to get Mac OS up and running was actually a = file on disk named "Mac OS ROM." -- Chris --Apple-Mail=_0CDDEC5B-DF74-47B2-81F4-2DBB1674BD9D Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=us-ascii On = Jul 21, 2020, at 9:26 PM, Henry Bent <henry.r.bent@gmail.com> wrote:

That was always really funny to = me.  Your machine boots MacOS, presumably because it was easier to = let it deal with hardware initialization than to rewrite = it

This is = actually because the Mac OS is already in the middle of booting, because = big chunks of it were ROM-resident. The ROM didn't just exist as a = bootstrap loader for any OS; it was a subset of the OS that = just loaded more of itself, replaced parts of itself, = etc.

This only ended with the adoption of Open Firmware by the = "New World" PCI-based Power Macintosh series. Even there, the = second-stage bootstrap invoked by Open Firmware to get Mac OS up and = running was actually a file on disk named "Mac OS = ROM."

  -- = Chris

= --Apple-Mail=_0CDDEC5B-DF74-47B2-81F4-2DBB1674BD9D--