98 lines
3.7 KiB
Plaintext
98 lines
3.7 KiB
Plaintext
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Subj: clearing things up... (50/50)
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From: The Cloud #8 Last on: 11/23/90
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Date: Fri, Nov 23, 1990 2:36:06 AM
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Macintosh ROM Secrets
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---------------------
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1) THE SE ROM SLIDESHOW
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In the ROM of the original Macintosh SE (*not* the SE/30!) is a four-frame
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slideshow composed of digitized b&w images of the development team.
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To view the slideshow, hit the interrupt switch to enter the debugger,
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and type the following: G 41D89A <return>.
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Alternatively, you can write a program which calls this procedure:
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PROCEDURE DoIt;
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Inline $4EF9, $0041, $D89A; { jmp $41D89A }
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The slideshow is an endless loop; once started, the only way to quit
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is by rebooting (or turning the power off).
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--
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2) THE "STOLEN FROM APPLE COMPUTER" ICON
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This icon lurks in the ROM of *every* Macintosh produced. Rumor has it
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that code to display this icon also exists in ROM, so that an Apple
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employee/wizard could walk up to a potential Macintosh clone, type a few
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commands, and verify that the machine's ROM was in fact "stolen".
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This icon exists at different locations in different versions of ROM;
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currently, yours truly has only been able to verify its existence in
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two of those versions:
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ROM Version 117, rev.1-3 (Macintosh Plus): $0040E132
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ROM Version 120, rev. 3 (Macintosh IIx, IIcx, SE/30): $408A065A
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If you have access to other machines, you can use the Graphic memory display
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feature of SUM II Tools 2.0 to locate the icon. (Be sure to set the memory
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base to $40800000, the starting address of ROM on the Mac II series, or
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$00400000 on a Mac Plus or earlier machine.)
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It's reasonable simple to write a program that displays the "stolen icon".
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Here's a THINK C function that does the job:
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PlotStolenIcon(inRect)
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Rect *inRect;
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{
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asm {
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BRA.S @2
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@1 DC.L 0x40E132 ;address of icon (Mac Plus ROM only!)
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@2 MOVE.L inRect,-(SP) ;push rect argument
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PEA @1 ;push "handle" to icon
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DC.W 0xA94B ;_PlotIcon
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}
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}
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--
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3) HIDDEN COLOR PICTURES IN THE IIci AND IIfx
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The 512K ROM (also known as the first "32-Bit Clean" ROM) introduced with
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the Macintosh IIci evidently had some extra room for fun.
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On the IIci, do the following:
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A) Go into the Control Panel and set the date to Sept. 20, 1989
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(9/20/89 -- this just happens to be the machine's release date.)
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B) Reboot and hold down cmd-option-c-i (yes, all 4 keys simultaneously.)
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C) Surprise! Up pops a color picture of some Apple employees!
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On the IIfx, the procedure is similar:
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A) Set the date to March 19, 1990 (3/19/90 -- the release date.)
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B) Reboot while holding down cmd-option-f-x.
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C) Yes, it's another color picture!
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--
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4) HIDDEN STARTUP DISK IN CLASSIC ROM
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The Macintosh Classic has an "undocumented feature": a complete, bootable
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system "disk" in ROM. This was an experiment in creating a "diskless
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workstation" machine that apparently wasn't considered important enough
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to mention as a feature. Rumor has it that the Macintosh LC and IIsi also
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contain a hidden ROM disk, but this has not yet been verified.
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To access the hidden disk, reboot the Macintosh Classic while holding
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down cmd-option-x-o. When the Finder comes up, the ROM disk should appear
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on the desktop. Note that you can use the Startup Device cdev to specify
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this disk as the startup device; subsequently, the machine will boot from
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ROM without the need for a "real" startup disk (handy, if you've only got
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one floppy disk drive.)
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--
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5) ???
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