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HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<title> Changes in Mini vMac 3.5.8 </title>
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<link rel="canonical" href="v3.5.html">
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</head>
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<body>
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<div>
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<i> <a href="https://www.gryphel.com/index.html">www.gryphel.com</a>/c/<a href="../index.html">minivmac</a>/<a href="index.html">change</a>/v3.5
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- <a href="https://www.gryphel.com/c/feedback.html">feedback</a> </i>
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</div>
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<hr>
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<h3 align=center>
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Mini vMac 3.5.8 <!-- *<i>Beta</i>* -->
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</h3>
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<h3 align=center>
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Changes
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</h3>
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<hr>
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<p> What has changed in Mini vMac 3.5.8, compared to Mini vMac 3.4.1.
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This only lists changes that affect behavior, and so doesn't
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include cleanups of the source code. </p>
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<p> : </p>
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<p>
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default compile:
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</p>
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<blockquote>
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<p>
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<a href="v3.5.html#feature">New features</a>
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</p><p>
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<a href="v3.5.html#modified">Changed behavior</a>
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</p><p>
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<a href="v3.5.html#bugs">Bug fixes</a>
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</p>
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</blockquote>
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<p>
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not in default compile:
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</p>
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<blockquote>
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<p>
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<a href="v3.5.html#compile_feature">New features</a>
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</p><p>
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<a href="v3.5.html#compile_modified">Changed behavior</a>
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</p><p>
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<a href="v3.5.html#compile_bugs">Bug fixes</a>
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</p>
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</blockquote>
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<p>
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<a href="v3.5.html#build">Build System</a>
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</p>
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<p> : </p>
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<p> <a name="feature"> <b> New features in default compile </b> </a> </p>
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<!-- A new feature is something you would not notice if you used
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Mini vMac as you used it previously. If using it as you would previously
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would behave differently, that is "changed behavior". -->
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<!--
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-->
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<p> * None Yet. </p>
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</p>
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<p> <a name="modified"> <b> Changed behavior in default compile </b> </a> </p>
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<!--
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<p> * None Yet. </p>
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-->
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<p> *
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Mini vMac should be faster on machines that aren’t PowerPC or
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x86-32. (And also Macintosh II emulation should be faster.)
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The C version of the 680x0 CPU emulation was optimized to
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be about as fast as the previous assembly code (that was only
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implemented for 68000 emulation on PowerPC and x86-32), and then
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the assembly code was removed. So Mini vMac should be much
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faster for variations where the old assembly code could not be used.
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Also, the x86-64 version is now faster than the old x86-32 assembly,
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and so is now preferred on machines that can run both x86-64 and x86-32.
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(On OS X, various bug fixes should make the Cocoa port now work as
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well as Carbon port, which wasn’t available on x86-64.)
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The C code is tweaked for a specific version of the GCC compiler.
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While other compilers are still supported, they can result in
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significantly slower emulation.
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</p>
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<p> *
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If Mini vMac reports an “Abnormal Situation”, it now
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also displays a 4 digit hexadecimal number. The original idea was
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that if something unexpected happens, you should first figure out how
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to reproduce the problem. Then the same thing can be done on a copy
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of Mini vMac with debugging stuff enabled. But this idea
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doesn’t work out so well if the problem can’t be
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reproduced, and seems to happen randomly and rarely. So now the
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non debug version of Mini vMac will display a number, which
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doesn’t take much code, so at least something can be learned.
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</p>
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<p> <a name="bugs"> <b> Bug fixes in default compile </b> </a> </p>
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<!--
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<p> * None Yet. </p>
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-->
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<p> *
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A badly behaved program could cause Mini vMac to crash, attempting to
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fetch an emulated instruction from random memory, which memory
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protection on a modern computer prevents. Since this is only a bad read,
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I don’t think any further harm was possible besides crashing Mini vMac.
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Most kinds of memory access emulated by Mini vMac have for a quite while
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been designed to always be accurate and safe. But for speed,
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fetching the next instruction would simply increment a pointer to where
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the instruction is in real memory, and relative branches would just
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offset this pointer. Only for certain long branches would Mini vMac work
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out from scratch where the instruction is in real memory. This is good
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enough for all known correctly working software. But it is in theory
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possible to write code so that the pointer to the next instruction gets
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set to arbitrary memory that the operating system may not allow Mini
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vMac to access, resulting in a crash. And not just in theory, I have
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seen this happen in programs running in Mini vMac that were
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malfunctioning. This bug is fixed by keeping low and high limits for
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the instruction pointer, and checking against them as the pointer is
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changed.
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</p>
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<p> *
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There is now some testing code that scrambles the mapping between
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emulated memory (for RAM and ROM) and real memory, splitting
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it into two sets of interleaved blocks (in effect toggling
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one bit of the address). Which exercises all the new
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boundary checking code. With a number of bug fixes it all worked.
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</p>
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<p> *
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In the Cocoa port, entering Full Screen should now work in
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recent versions of OS X, instead of immediately exiting. For
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safety Mini vMac automatically leaves full screen mode if it notices
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the screen size has changed, implemented in the Cocoa port by
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looking for the notification applicationDidChangeScreenParameters.
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But recent OS X gives this notification on entering Full Screen
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mode, when it didn’t used to. So the Cocoa now records the main
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screent Rect, and only exits full screen mode if it has changed.
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This problem was
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<a href="https://www.gryphel.com/c/mail/v3.html#m61">reported by Tim</a>.
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</p>
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<p> *
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The Cocoa port would draw incorrectly in full screen mode if
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the emulated screen is larger than real screen.
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</p>
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<p> *
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There is a fix for drag and drop in the Cocoa port.
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When Mini vMac becomes the active application, all emulated key are
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usually considered to be up, even if the actual keys are still being
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held down. But there is an exception for modifier keys held down on drag
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and drop (after which Mini vMac makes itself the active application), so
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that holding down command and option can be used to rebuild the desktop
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files of emulated disks. This exception worked in Carbon, but not
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previously in Cocoa. I’ve now figured out how to get the modifier keys,
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by using [NSEvent modifierFlags]. This only work in OS X 10.6 and later,
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so Mini vMac checks that this method is available before using it.
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</p>
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<p> *
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In the Cocoa port, when Mini vMac
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is launched by dragging a disk onto the application icon, but there
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is also a disk1.dsk image, it now matches the behavior of other
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ports in mounting the dragged image after disk1.dsk instead of
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before.
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</p>
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<p> *
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In the Cocoa port, when importing and exporting the text clipboard,
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Mini vMac was not translating the end of line format.
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</p>
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<p> *
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In the Cocoa port, when importing the text clipboard, if there were
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any characters that could not be translated (because they are not in
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MacRoman), nothing would be translated. Now, such characters will
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translate to “?”.
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</p>
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<p> *
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In the Cocoa port, when dragging the Mini vMac window
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around by its title bar, the emulated cursor position was
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incorrect. (The emulation continues running during the
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drag in this port.)
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</p>
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<p> *
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In the Cocoa port, if the mouse is moved over the dock, the
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cursor is made visible by the operating system, but if the
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mouse was then moved directly back into the Mini vMac window
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(and there was nothing in between), the system cursor was not made
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invisible again, so the system cursor and the cursor of the
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emulated Macintosh were drawn on top of each other.
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</p>
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<p> *
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In the Windows version of Mini vMac 3.4, the Mini vMac window
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is resizable. This happened when fixing a call to CreateWindowEx
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to stop using an invalid window style. The fix is now fixed
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by not including WS_THICKFRAME in the style.
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</p>
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<p> *
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There have been reports of graphics problems in the Linux version,
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which is suspected to result from drawing
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images with one bit per pixel to the screen not being
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properly implemented in at least some versions of Linux,
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with at least some hardware. So Mini vMac will now always pass 32
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bit per pixel images to the operating system (for Linux and
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other X versions), even for
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black and white images. This could potentially be much less
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efficient, so there is a new compile time option to behave
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as before,
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“<a href="../options.html#option_ci">-ci 0</a>”.
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</p>
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<p> *
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A C compiler is allowed to assume
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that two pointers of different types don’t point to the same
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memory location. But this assumption could break Mini vMac.
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So now for GCC 4.7.4 the option "-fno-strict-aliasing" is
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used to prevent this assumption, which appears to make no
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significant difference in speed. But for other compilers,
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Mini vMac will now try to work correctly even with this
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assumption (basically by taking out optimizations for
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big/little endian), which will slow it down a bit.
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</p>
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<p> *
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The emulation of the CMPI instruction was considering pc relative
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addressing to be illegal, when it is actually fine (though odd). As
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<a href="https://www.gryphel.com/c/mail/v5.html#m5">reported by Adam</a>, this
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broke Dynamix adventure games. This was in Macintosh II emulation,
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but the bug was also present in the default Macintosh Plus emulation.
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</p>
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<p> *
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The emulation of the Move to SR instruction now checks for
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Privilege Violation.
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</p>
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<p> <a name="compile_feature"> <b> New features not in default compile </b> </a> </p>
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<!--
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<p> * None Yet. </p>
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-->
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<p> * A new build system option
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“<a href="../options.html#option_lang">-lang ptb</a>”
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selects a Brazilian Portuguese translation of the user interface by
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<a href="http://www.mteam7.com/en/">Mauricio</a>.
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</p>
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<p> *
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Normally, when in Full Screen Mode, Mini vMac
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will try to “grab” the keyboard, preventing the operating
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system from intercepting keys. So in the Windows version,
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the ‘windows’ key can be used as an ‘option’ key, instead
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of popping up the “Start” menu. And in the
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OS X version, Command-Tab won’t switch away from Mini vMac.
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This is also implemented in the X version. There is a new build option,
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<a href="../options.html#option_gkf">-gkf 0</a>”, that
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disables grabbing the keyboard, allowing
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the operating system to intercept keys when Mini vMac is
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in Full Screen Mode. This was
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<a href="https://www.gryphel.com/c/mail/v3.html#m70">requested</a>
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by a maintainer for “Rocket Launcher”.
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</p>
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<p> *
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Can now use a “Twiggy” Macintosh prototype ROM,
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after merging in work by Matěj Hybler.
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(There are two known disk images that will work with it.)
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The build option is
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<a href="../develop.html#option_m">-m Twiggy</a>”.
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(This is not an officially supported option, advanced users
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can compile this version if they want to try it.)
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</p>
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<p> *
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Can now also use an even earlier “Twiggy” Macintosh
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prototype ROM, merging in further work by Matěj Hybler.
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(The same two disk images will work with it.)
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The build option is
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<a href="../develop.html#option_m">-m Twig43</a>”.
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(This is not an officially supported option, advanced users
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can compile this version if they want to try it.)
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</p>
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<p> *
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The new option
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“<a href="../options.html#option_ahm">-ahm</a>”
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patches the ROM to replace the “Happy Mac” icon displayed
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on boot when a disk is inserted, with one of the images designed
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by Steve Chamberlin for his
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<a href="http://www.bigmessowires.com/mac-rom-inator/">Mac ROM-inator</a>
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(used with permission).
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</p>
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<p> *
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The new option
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“<a href="../options.html#option_rsz">-rsz</a>”
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allows you to set the size that Mini vMac expects the ROM image to be.
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The build system will normally select the correct ROM Size
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for the Macintosh model you have chosen to emulate. But
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you can now override this, such as to use a ROM image for
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Steve Chamberlin’s
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<a href="http://www.bigmessowires.com/mac-rom-inator/">Mac ROM-inator</a>.
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</p>
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<p> *
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The new option
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“<a href="../options.html#option_chr">-chr 0</a>”
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prevents Mini vMac from checking the ROM checksum.
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The first 4 bytes of a Macintosh ROM contain a checksum of
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the remaining bytes, and there is code in the ROM to check
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the checksum on boot. Mini vMac patches the ROM image, so
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it disables this checking code. Mini vMac does the check
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itself before patching the ROM. It also checks that the
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4 byte checksum matches one of the known ROM images
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for the model you have chosen to emulate.
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This option disables these checks, which is useful
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if you want to use Mini vMac with a modified ROM image, such
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as for Steve Chamberlin’s
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<a href="http://www.bigmessowires.com/mac-rom-inator/">Mac ROM-inator</a>.
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</p>
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<p> *
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The new option
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“<a href="../options.html#option_drc">-drc 0</a>”
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prevents Mini vMac from disabling code in ROM that checks
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the ROM checksum on boot.
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Since Mini vMac patches the ROM, it also patches
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out this check. If you are using a ROM image with Mini vMac that
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is already patched (such as for Steve Chamberlin’s
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<a href="http://www.bigmessowires.com/mac-rom-inator/">Mac ROM-inator</a>
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), this check may already be patched out. In that case Mini vMac
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doesn’t need to, and probably shouldn’t, to avoid interference
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in case a different method of patching out is used.
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</p>
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<p> *
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The new option
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“<a href="../options.html#option_drt">-drt 0</a>”
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prevents Mini vMac from disabling code in ROM that tests
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proper operation of RAM at boot. Mini vMac normally patches the ROM
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to disable this test, to speed up booting. For greater realism, you
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can leave this test in.
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</p>
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<p> *
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The port to SDL 2 now supports importing and exporting the host
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clipboard (like most other ports). It also supports the same
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“-d” and “-r” command line options as
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the X ports. And it now uses the function SDL_GetBasePath for
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the directory to look for the ROM image and the disk1.dsk, disk2.dsk,
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etc. images (and also the debug log file, when enabled).
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In the OS X version, in the "Info.plist" file it uses the key
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"SDL_FILESYSTEM_BASE_DIR_TYPE" with value "parent", so that
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Mini vMac will looking for these images in
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the folder containing Mini vMac, like in most other ports.
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It also now ignores command line arguments starting
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with “-psn”, which on OS X allows it to be launched
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by double clicking without getting an error message. (Previously
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it had to be launched with the command line.) Like other
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ports, there are now separate magnify states for when in
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full screen mode and when not. And when first entering full screen
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mode, the magnify state is set automatically depending on the
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screen size. A new feature only in the SDL port so far
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is that using the scroll wheel of the mouse acts as if
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arrow keys are pressed, giving roughly the expected behavior
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of a scroll wheel.
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<p> <a name="compile_modified"> <b> Changed behavior not in default compile </b> </a> </p>
|
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|
<!--
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<p> * None Yet. </p>
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-->
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<p> * In the Macintosh II emulation, when compiled with 256
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colors or 16 colors or 4 colors, the initial value
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in the Parameter RAM is now set to boot in color.
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So the initial picture is in color. (Soon after,
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the color mode is changed to the value saved on
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disk.) This didn’t use to work, which is why it
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was previously set to boot in black and white.
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It seems to work now, for reasons not investigated
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yet (probably one of various fixes to video emulation).
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It still doesn’t work for thousands or millions
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of colors.
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</p>
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|
|
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<p> <a name="compile_bugs"> <b> Bug fixes not in default compile </b> </a> </p>
|
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|
<!--
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<p> * None Yet. </p>
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-->
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<p> *
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The video driver in the Macintosh II emulation now implements
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indexed SetEntries. This is used by the game Crystal Quest
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(which by the way requires color depth to be 16 colors).
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Also for non-indexed SetEntries, the driver now returns
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the no error code. (Apparently this error code is
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not usually paid attention to.)
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</p>
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<p> *
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Tara Keeling reported a bug in the Macintosh II emulation,
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where if the emulation was running slow enough (such as 1x speed),
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and there is a “disk1.disk” and
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“disk2.disk”, then the second disk image won’t
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get mounted. There is code to delay mounting the second disk
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one second after the first disk, which is good enough for
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Macintosh Plus emulation, but apparently not for the Macintosh II.
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So the delay has been increased to four seconds, but also now when
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a kDriveStatus call is made to the replacement disk driver, the
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delay is reduced (to about a fifteenth second). The emulated
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computer appears to be ready for a new disk after this call. (Not
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reducing the delay to zero is just being conservative.) So even
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for the default Macintosh Plus emulation, when inserting
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multiple disks there is now usually much less delay.
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</p>
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<p> *
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In the built in disassembler ("-dis"
|
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option), the shift instructions L and R were reversed
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(such as for ASR and ASL).
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</p>
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<p> *
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A problem may be fixed in the Macintosh II emulation,
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<a href="https://www.gryphel.com/c/mail/v4.html#m8">reported by Stephen Barbieri</a>,
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caused by the FPU emulation not coping with invalid inputs.
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</p>
|
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<p> *
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In the Macintosh II emulation, an “Abnormal Situation”
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report seen when using the Restart command of the Finder has been
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removed, since this actually seems to work fine now.
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</p>
|
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<p> *
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The emulation of the Move from SR instruction now checks for
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Privilege Violation on 68020 (it is not a Privilege Violation on 68000).
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</p>
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<p> <a name="build"> <b> Build System </b> </a> </p>
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<!--
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<p> * None Yet. </p>
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-->
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<p> *
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The build system has a new Development Environment option, Mini
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vMac C (“<a href="../develop.html#option_e">-e mvc</a>”),
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which is really just a particular version
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|
of GCC and supporting projects, compiled into a set of cross
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|
compilers, that is used for official
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binaries. The advantage of using a single compiler version
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|
is in getting consistent performance across different
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operating systems. Also it easier to tweak C code to get
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|
good performance for a single compiler, than to try to make
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|
code that is optimum for all C compilers.
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|
</p>
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|
|
|
<p> *
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The build system normally selects the source files needed to
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|
compile the requested variation. There is now an option
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|
to include all source files:
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|
<a href="../develop.html#option_all_src">-all-src 1</a>”.
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To make this work, all source files now have unique names,
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|
rather than have multiple files with the same name in
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|
different folders in the source archive, for choices of
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API, sound API, language, icons.
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|
</p>
|
|
|
|
<p> *
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|
Support for assembly language is removed, including
|
|
the option “-no-asm”.
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|
</p>
|
|
|
|
<p> *
|
|
There is now an option to put generated configuration files
|
|
into a separate directory from the source files:
|
|
“<a href="../develop.html#option_all_src">-cfg 1</a>”.
|
|
This is only supported for
|
|
“<a href="../develop.html#option_e">-e mvc</a>”.
|
|
</p>
|
|
|
|
<p> *
|
|
The Export command would not overwrite an existing file
|
|
(after the Standard Put File dialog asks if you want to replace it).
|
|
</p>
|
|
|
|
<p> * The build system now supports Xcode 7.3.1
|
|
(with “<a href="../develop.html#option_ev">-ev 7310</a>”),
|
|
and also 8.2.1 (“-ev 8210”).
|
|
Though not tested,
|
|
other versions of Xcode in between should also work, by constructing
|
|
the “-ev” option in the same way.
|
|
</p>
|
|
|
|
<p> * The build system now supports Microsoft Visual Studio 2017
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|
(with “<a href="../develop.html#option_ev">-ev 15000</a>”).
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|
</p>
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|
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|
<p> : </p>
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|
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|
<p> If you find Mini vMac useful, please consider
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|
<a href="https://www.gryphel.com/c/help/index.html">helping the Gryphel Project</A>,
|
|
of which it is a part. </p>
|
|
|
|
<a href="https://www.gryphel.com/index.html">
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|
<img src="https://www.gryphel.com/d/gryphel-32.gif" width=32 height=32 border=0
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|
alt="gryphel logo, 1K"
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|
>
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|
</a>
|
|
|
|
<p> Back up to - <b><a href="index.html">Changes in Mini vMac versions</a></b></p>
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|
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|
<hr>
|
|
|
|
<div>
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|
|
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<i> <a href="https://www.gryphel.com/index.html">www.gryphel.com</a>/c/<a href="../index.html">minivmac</a>/<a href="index.html">change</a>/v3.5
|
|
- <a href="https://www.gryphel.com/c/feedback.html">feedback</a> </i>
|
|
<br>
|
|
copyright (c) 2017 Paul C. Pratt - last update 7/9/2017
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</div>
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</body>
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</html>
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