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<title> Changes in Mini vMac 3.2.3 </title>
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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<link rel="canonical" href="v3.2.html">
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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>/v3.2
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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 3.2.3 <!-- *<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 3.2.3, compared to Mini vMac 3.1.3.
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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="v3.2.html#feature">New features</a>
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</p><p>
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<a href="v3.2.html#modified">Changed behavior</a>
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</p><p>
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<a href="v3.2.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="v3.2.html#compile_feature">New features</a>
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</p><p>
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<a href="v3.2.html#compile_modified">Changed behavior</a>
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</p><p>
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<a href="v3.2.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="v3.2.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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<!--
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<p> * None Yet. </p>
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-->
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<p> * Auto scrolling: If the emulated screen is larger than the real screen
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while in full screen mode, the emulated screen will be scrolled to keep the
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mouse pointer in view.
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(Previously only the top left corner would ever be displayed, and even
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that didn't work quite right.)
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</p>
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<p> * "AutoSlow": Mini vMac will automatically shift down to 1x speed
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if there is no activity for a while. This helps to preserve the battery
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on portable computers. </p>
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<p> If the user types, or clicks or moves the mouse, or the emulated
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computer draws to the screen, or reads or writes to an emulated disk,
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that counts as activity that prevents AutoSlow. </p>
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<p> AutoSlow takes effect after either 0.5 seconds of emulated computer
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time, or 16 seconds worth of emulated instructions executed (usually about 2
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seconds at the default 8x speed), which ever is longer. </p>
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<p> It is possible that some software will not draw anything to the screen
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for longer than that while doing real work, so the AutoSlow feature
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can be disabled with Control-S-W. Also, the compile time option '-as 0'
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causes Mini vMac to start with AutoSlow disabled. </p>
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<p> A blinking insertion point will not prevent AutoSlow. This required
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improving the code for detecting how much of the emulated screen was changed.
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This makes Mini vMac more efficient in general, since transfering
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images to the real screen tends to be expensive.
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Previously it would detect that areas at the top and bottom of the emulated
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screen hadn't changed, to limit the amount of drawing to the real screen.
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Now it can detect that areas at the left and right of the emulated screen
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haven't changed. If the remaining area that has changed is only a single
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pixel wide and less than 32 pixels tall, it is assumed to be only a blinking
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insertion point, that doesn't prevent AutoSlow. </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> * Have begun making tweaked assembly version of 68000 emulation
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for Intel x86 computers (starting from assembly language generated by gcc).
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This makes Mini vMac faster, as well as giving
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more consistent results when Mini vMac is compiled with different
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development environments. (Had previously only made tweaked assembly
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language for PowerPC computers.)
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</p>
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<p> * Improved accuracy of timing. Mini vMac now measures time in cycles
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rather than instructions executed. In the simplest form, all instructions
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are assumed to take the same number of cycles, and this closely matches
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the results of previous versions of Mini vMac. (Mini vMac actually counts
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sixty fourth cycles, not just integer number of cycles, so that average
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times of instructions can be more accurate.) But by default, Mini vMac
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now assigns an average number of cycles for each of the 65536 primary opcodes.
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<p> As a compile time option, in addition to using the table, Mini vMac can
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try to compute more accurate cycles for certain instructions, depending
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on the current data. This is slower, and only implemented in the C version
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of the 68000 emulation, making it slower still. </p>
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<p> The build system option "-ta 0" selects the least accurate of these three methods,
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the default is "-ta 1", and "-ta 2" selects the most accurate. </p>
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<p> The most accurate option is still not completely accurate. Completely accurate
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timing would be exceedingly difficult. For example, the CPU and video output
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conflict for accesses to RAM, and that would seem very complex to model. </p>
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<p> The greater accuracy is so far mostly theoretical. The timings were
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entered from Motorola documentation. It needs to be tested and calibrated
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by comparing to real hardware. Currently 68000 timings are used even in
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the 68020 emulation. More accurate timing for 68020 should be added in a
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future version. Truly accurate timing for 68020 would be much more difficult
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than for the 68000 because of pipelining and caching, probably to the point
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of being unfeasible for Mini vMac. But more accurate averages should be possible.
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</p>
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<p> * Mini vMac will now by default mount disk images in Disk Copy 4.2 format
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as read only. This is because by default Mini vMac ignores the checksum and
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tags of this format, so writing to the image makes it invalid. Mini vMac can
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be compiled with full support for this format, in which case the images will
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be writable. </p>
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<p> The new utility
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<a href="../extras/cnvtdc42/index.html">CnvtDC42</a>
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converts Disk Copy 4.2 format images to a new
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image without the tags and checksums, that the default version of Mini vMac
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can write to.
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</p>
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<p> * The Windows and Linux versions now match a previous feature of the
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Macintosh versions. When switching from full screen to normal mode,
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or toggling magnification in normal mode, it will preserve the emulated
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cursor position, by moving the host computer's cursor.
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</p>
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<p> * As an additional safety feature, the control mode confirmation for
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the reset, interrupt, and quit commands will now treat anything other than
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'y' as meaning no, rather than ignoring it. (With exception that a repeated
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key is ignored - so 'q' is ignored for quit, 'r' for reset, and 'i' for
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interrupt.) This is because I once managed to accidentally reset Mini vMac
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by typing unintentionally into control mode.
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</p>
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<p> * The power button can now be used in the OS X version when in full
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screen mode, to put the (real) computer to sleep.
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</p>
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<p> * I've rearranged the Mini vMac about page (Control-A) a bit to make
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room for another idea I have for the variations. It no longer displays
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which computer is being emulated. That can be inferred from the
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variation number.
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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> * In OS X, changing the screen configuration, such as switching
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between using the internal screen of a MacBook Air and an external screen,
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would tend to make Mini vMac stop drawing.
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</p>
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<p> * In OS X, if the screen configuration changes when in full screen mode,
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Mini vMac will turn off full screen mode, instead of just leaving the emulator
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window at a size that is now wrong.
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</p>
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<p> * In OS X, may now have a viable work around for
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misbehavior of the operating system calls to hide and show the
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cursor. The most easily reproducible such situation was when the
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computer went to sleep and then wakes up, the real cursor
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would end up visible.
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</p>
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<p> * In OS X, the operating system can sometimes bring up a dialog, such
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as for force quit (upon command-option-escape), and Mini vMac wouldn't
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notice, leaving the real cursor hidden, making the dialog hard
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to use. </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> * The build system option, "-emm 0", disables the more accurate mouse emulation
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normally used in full screen mode. This allows Mini vMac to work somewhat better on
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tablet computers without a mouse. But such computers are still not really supported.
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</p>
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<p> * The build system option, "-var-fullscreen 0", makes the full screen mode option
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a constant rather than a variable. So "-var-fullscreen 0 -fullscreen 1" will make
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Mini vMac always run in full screen mode, and "-var-fullscreen 0 -fullscreen 0" will
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make Mini vMac never run in full screen mode. The "F" control mode command disappears.
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</p>
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<p> * The build system option "-log" enables improved logging infrastructure for
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debugging in Mini vMac. It can now write out megabytes of information per second to
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a log file without bogging down the emulation too much. (On a modern machine.)
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But nothing much will happen without further enabling or creating code to log
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various events that you are currently interested in. This is for developers only.
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</p>
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<p> * The build system option "-dis" enables a disassembler built into the emulator.
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Besides disassembling a number of instructions executed after an event of interest,
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it can disassemble instructions prior to the event, as the emulator can save
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the addresses of instruction executed to a circular buffer.
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Requires the "-log" option. Nothing much will happen without further enabling
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or creating code to log various events that you are currently interested in.
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This is for developers only. </p>
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<p> * The build system option "-intl" forces Mini vMac to support
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international characters in the user interface, even when using the
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default English. This is useful if the maintainer name needs
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the extra characters. (It would be nicer for the build system
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to figure out for itself what character set is needed. But
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this will do for now.) </p>
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<p> <a name="compile_modified"> <b> Changed behavior not in default compile </b> </a> </p>
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<p> * None Yet. </p>
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<!--
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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> * Improved FPU emulation, originally written for Mini vMac
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by Ross Martin. This code was modified to
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use SoftFloat, by John Hauser (as found used in the Bochs emulator),
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plus some extensions to SoftFloat by Stanislav Shwartsman
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(also found in Bochs).
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Though using SoftFloat is slower than using native floating point,
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it ensures consistent results on different computers,
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and makes it easier to compile with different development environments.
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There's still a lot of work to do on the FPU emulation, but it already
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allows much more software for the Mac II to run without crashing.
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</p>
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<p> * In many cases the Macintosh II emulation can now emit sound that is
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recognizably related to how it is supposed to. It's not perfect yet,
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and due to the nature of sound that means it not really yet usable at all.
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But it is significant progress. </p>
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<p> * The Macintosh II emulation supports more than 1M of video ram in
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24 bit addressing. (One noticable effect is that allows identify
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displays button in monitors control panel to work.)
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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> * The build system and the extras are easier to compile with different
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Macintosh 680x0 C compilers.
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</p>
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<p> * The build system now supports the Digital Mars Compiler (with "-t wx86 -e dmc")
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and the Pelles C Compiler (with "-t wx86 -e plc" and "-t wx86 -e plc -cl").
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</p>
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<p> * The build system now supports XCode 4.0.2 (with "-ev 4000"). </p>
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<p> * There is better support in general for different versions of Microsoft
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Visual Studio. Specifically, support has been added for
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Visual Studio 2010 (with "-ev 10000"), Visual Studio .NET 2003
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(with "-ev 7100"), and Visual Studio .NET 2002 (with "-ev 7000").
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</p>
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<p> * There is a new build system option, "-t lx64", to target for 64 bit Linux.
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And there is a new option, "-t wx64", to target for 64 bit Windows.
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Both would currently be slower than the 32 bit versions, because those versions
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now have some assembly language tweaking.
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</p>
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<p> : </p>
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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>,
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of which it is a part. </p>
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<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>
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<p> Back up to - <b><a href="index.html">Changes in Mini vMac versions</a></b></p>
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<hr>
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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>/v3.2
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- <a href="https://www.gryphel.com/c/feedback.html">feedback</a> </i>
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<br>
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copyright (c) 2011 Paul C. Pratt - last update 11/13/2011
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</div>
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</body>
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</html>
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