Epoch Ravine (alpha) Mac OS

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Epoch Ravine (alpha) Mac Os 11

Welcome to Epic Games Store! Download and play PC Games of every genre. We have mods, DLC and Free Games too! Games for everyone. 令和3年度(2021年度)岱志高等学校pta総会のお知らせ ※岱志高校定時制保護者向けの連絡です。.

Change Note
V2.0.0 11-Feb-91 Release of CDF V2.0.
V2.1.0 7-Jun-91 Release of CDF V2.1.
V2.2.0 20-May-92 Release of CDF V2.2.
V2.3.0 1-Oct-92 Release of CDF V2.3.
V2.4.0 26-Jan-94 Release of CDF V2.4.
V2.5.0 21-Dec-94 Release of CDF V2.5.
V2.6.0* 23-Feb-96 Alpha release of CDF V2.6.
V2.6.0# 5-Apr-96 Beta release of CDF V2.6.
V2.6.0& 13-Jun-96 Beta release of CDF V2.6.
V2.6.0$ 17-Jun-96 Beta release of CDF V2.6.
V2.6.0@ 15-Aug-96 Beta release of CDF V2.6.
V2.6.0 10-Oct-96 Release of CDF V2.6.
V2.7.0 27-Sep-99 Release of CDF V2.7.
V2.7.1 16-May-01
  • Add new ports: Solaris on PC, MacOS X and Linux on DEC/Alpha.
  • Correct bugs in CDFDump program.
  • Correct and enhance CDF-Java APIs and Java Native Interface (JNI).
  • Add new Java-based tool programs for CDFEdit and CDFExport.
  • Add variable name checking in CDFconvert for compression option.
  • Add Cygwin port for win32 on PC. Create individual tool programs for Windows using Cygwin libraries.
05-Dec-01 Add a new set of APIs: CDFgetrVarsRecordData, CDFgetzVarsRecordData, CDFputrVarsRecordData and CDFputzVarsRecordData to allow a full single record read/write for a group of r/zVariables.
26-Jan-02 Correct a bug in cdfcmp.c for showing dimension size differences between two zVariables.
28-Jun-02 Add a new option in cdfcmp.c to allow tolerance checks while comparing two unequal data values.
22-Jul-02 Handle f77 Fortran for Cygwin.
25-Nov-02
  • Add 64-bit mode for Solaris/sparc64 for sparcv9.
  • gcc for 64-bit is added.
V2.7.2 08-Apr-04 Change the way that current variable select is being handled. Keep the current variable selected offset as a reference for any following variable selection. Originally, each time a selection of a variable or getting a variable's field data will start the search for that variable ALWAYS from the beginning of the variable list. It requires too many I/Os for accessing a sequence of variables.
04-May-04 Corrected a bug that caused the f77 to fail under 64-bit environment.
V3.0 07-Jan-05
  • Changed file offset from type long (32-bit) to off_t (64-bit) for the platform on which the data type is supported. Changed the file I/O functions accordingly. The CDF internal file structures are changed. Made the library backward compatible, meaning programs created from V3.0 can still access (read/update) the CDF files of older version.
  • Expanded the length of variable and attribute name from 64 to 256.
  • The CDF/Java was modified to ensure that concurrent accessing a CDF would be thread-safe.
  • Added a new data type, CDF_EPOCH16, to accommodate more refined time resolution within a second. A new set of functions, similar to those of CDF_EPOCH data type, was added.
  • Modified cdfdump tool program to be more efficient in data reading.
25-Mar-05 Changed JNI and Java-CDF APIs to ensure proper operations within the multiple-threaded environment.
V3.1.0 27-May-05 Added new sets of APIs to allow Standard Interface to interact with zVariables and other CDF-related information.
11-Jul-05 Added MingW port for PC.
05-Aug-05 Added new functions to allow creating CDF files in older, V2.7, version, not just the default V3.1.
18-Jan-06 Modified code, including tools, to handle file path that has '.cdf' or '.skt' extension while it is not expected to be there.
30-Jan-06 Add FreeBSD port for PCs.
1-Feb-06 Added Intel C++ and Fortran compilers for Linux port on PCs.
22-Jun-06
  • Added support for HPUX and AIX for both 32 and 64-bit mode.
  • Allow Mac OS X to build code for PPC and i386.
V3.1.1 12-Oct-06
  • Modified to allow upper/lower case CDF name for Windows.
  • Changed Epoch to make 9999-12-31 23:59:999 as encoded date for the filled value of -1.0E31. For EPOCH16, a pair of -1.0E31 filled values is encoded as 9999-12-31 23:59:999:999:999:999.
V3.2.0 21-Oct-06 Added MD5 checksum feature for data integrity check of the CDF. Modified tools to use the checksum feature. Added a couple of new tool programs: cdfdump and cdfmerge. Renamed the original cdfdump to cdfirsdump.
25-Apr-07 Changed the default size of cache buffers from 512 to 10240 bytes to improve data access performance.
18-Jun-07 Enhanced READONLY mode to improve meta-data access performance. When READONLY mode is selected, all meta-data is read and stored in internal data structures which are then accessed whenever meta-data is requested.
V3.2.1 24-Apr-08 Modified the library so a potential buffer overflow vulnerability when reading specially-crafted (invalid) CDF can be avoided.
V3.2.2 10-Aug-08 A maintenance release. Modified the Java tools so they can handle CDF files with space(s) in the file path. cdfmerge tool was modified to allow merging 'Epoch' variable data just like other variables. Also, corrected a couple of bugs related to READONLY mode functions that cause memory leak and fail to find attribute entries.
V3.2.3 24-Nov-08 Modified CDFdump to add a new output option.
V3.2.4 20-Jan-09 Bug fixed for checksum option running on 64-bit machines.
V3.3.0 10-Jun-09
  • Added an optional process to validate data fields in a CDF when it is open. This process addresses a potential issue of library becoming vulnerable when a compromised CDF is accessed.
  • A new tool, cdfvalidate, is added.
  • All CDF tools, except cdfconvert, will have sanity checks on.
  • Added Linux running on PPC.
  • Modified CDF-Java code and JNI to properly handle multi-dimensional variables in COLUMN-major file, and preserve variable's dimensionality if a non-variant dimension exists.
V3.3.1 5-May-11
  • Added several new features to cdfexport tool program.
  • Bug fixed in Java-CDF APIs and a couple of new methods were added.
  • New features were added to cdfdump to allow selected variables and a range of records to be dumped.
  • MingW port was revised to handle 'pdcurses', if installed, for the curses-based tools.
  • Fixed cdf validation to allow some V2.0 files to be valid.
  • Bugs fixed in the core library, Java-CDF APIs and tools.
1-Sep-11 (V3.3.1.1) Fixed 64-bit Fortran on Solaris/Intel port. Changed release sub-increment from an character to an alphanumeric number. Fixed Java and C# APIs. Fixed library bug.
V3.3.2 5-Sep-11 (V3.3.2.1-2)
  • Added CDF_INT8 and CDF_TIME_TT2000 data types.
  • Implemented leap seconds into CDF_TIME_TT2000.
  • New features were added to handle epoch values in/to CDF_TIME_TT2000: including encoding, decoding, parsing, computing and breakdown.
  • Bugs fixed in the core library.
9-Jan-12 (V3.3.2.3)
  • Email address changed for cdfsupport.
  • Bugs fixed in the core library and other APIs.
V3.4.0 1-Mar-12 (V3.4.0.0)
  • Convert V3.3.2.3 to new version.
  • Reset pad values for INT8 and TT2000 data types.
V3.4.1 10-May-12 (V3.4.1.0)
  • Bugs fixed in core library.
  • Minor changes in skt2cdf tool program and cdfdump help.
  • Fixed cdfmerge while using text file for input files control.
  • Modified Java CDF class's open method to delay collecting variable and attribute data.
V3.5.0 10-Oct-12 (V3.5.0.0 beta)
  • Bugs fixed in core library and tool programs.
  • Used open source zlib source code to replace CDF's modified GZIP compression/decompression from original code by Jean-loup Gailly and Mark Adler.
  • Modified the default blocking factor for compressed variable data to improve performance.
15-Sep-13 (V3.5.0.1)
  • Fixed minor memory leaks in core library and JNI.
  • Added a new option to cdfdump tool for how to show the floating-point values if FORMAT entry is missing.
  • Added support for Visual Basic on Windows.
  • Pad value is set when a variable is created.
  • Fixed code to save CDFid for 64-bit Fortran when a CDF is open/created, even only 4-byte of it is used in Fortran code.
  • Default pad values are set with rather invalid values, so they can be recognized easily.
31-Mar-14 (V3.5.0.2)
  • Use the latest open source zlib version 1.2.8.
  • Properly handle writing string typed pad value that could contain garbage if the length of value is less than the variable's defined number of elements.
  • Added support for NaN, INF, -INF for floating point values.
  • Minor bugs fixed.
V3.6.0 01-Mar-15 (V3.6.0.3)
  • Added a new leap second for 07-01-2015 in the leap second table.
  • Added a new header field in a CDF to record the leap second table the file is based upon. A set of get/set operations were implemented in all APIs.
  • Added a new record delete option in the library, which will rearrange remaining records for sparse record variables.
  • Skipped checking the given CDF file name for ASCII for reading. Only enforce the file name to be ASCII, but not the directory portion, if provided, for creating a CDF.
  • Tool cdfconvert has a few new options: 1. sort the keyed variable, e.g., Epoch, for the output file, 2. globally reset the blocking factor, 3. reset the leap second last updated date, 4. adjust the TT2000 time.
  • Tool cdfdump was modified to detect whether a CDF is a valid one, even at the variable data level.
  • Minor bugs fixed.
10-Jun-15 (V3.6.0.4)
  • Modified the cdfjava jar file. Extended the CDF status message length.
V3.6.1 20-Sep-15 (V3.6.1.0)
  • Used the preserved system temporary folder, e.g. /tmp for Linux/Unix/MacOSX, to hold the temporary file(s) while doing compression/decompression.
  • Set temporary file name using the random number generator with process id and current time as the seed.
  • Added support for computing TT2000 from UTC if the passed day is DOY (day of the year from January 1st).
  • Added a few options to cdfconvert tool program.
V3.6.2 20-Mar-16 (V3.6.2.0)
  • Modified to Makefile and installation process to support Mac OS X El Captain (10.11).
  • Modified the library to handle string data that has a shorter length than defined (number of elements) when reading/writing. It will be filled with spaces, starting from the NUL.
15-May-16 (V3.6.2.1)
  • Bug fixed for computing TT2000 time if only year/month/day components are entered.
V3.6.3 5-Oct-16 (V3.6.3.0)
  • Added a new leap second for 1/1/2017.
  • Added a new set of CDFread C-based functions.
  • Added new features in cdfdump, cdfstats tool programs.
10-Jan-17 (V3.6.3.1)
  • Modified the data write functions for TT2000 data type to update the leap second last updated header field from the leap second table. This resolves a problem if a master/template CDF is used for creating CDFs as its header field value never changed.
V3.6.4 20-Mar-17 (V3.6.4.0)
  • Used C-based function to create the temporary files, in 'mycdftmp.XXXXXX' form, for compression/decompression.
  • Used a more orderly check for the directory to hold the temporary files.
  • Modified cdfexport to not truncate variable name for output.
  • Have a separate patch for supporting IDL 8.6.
V3.7.0 20-Apr-18 (V3.7.0.0)
  • Allowed Null-terminating string for variable data and attribute entries.
  • Allowed multiple strings for variable attribute entry.
  • Added support for ARM architecture.
  • Added Itanium IA64 on OpenVMS.
  • Added pure Java package, cdfj.jar, for CDF read/write.
  • Enhanced the CDF XML schema.
V3.7.1 29-May-19 (V3.7.1.0)
  • Added a set of more generalized CDF epoch data encoding and parsing functions. Modified the default encoded epoch data to be of ISO 8601 form.
  • Added a new set of CDF epoch data conversion to/from Unix time.
  • Modified cdfconvert tool program to set the rVariables' dimension to zero (0), when converting a CDF with zMode 2. Simialar change is also applied to cdfexport tool program.
  • Enhanced the CDF XML schema.
  • Bugs fixed.
V3.8.0 6-Mar-20 (V3.8.0.0)
  • Modified the code to use a variable's FILLVAL, replacing its PAD value, for all variable's missing data if it exists, provided its data type being equivalent to its variable's.
  • String typed variable's pad value is filled with a single space and followed by NUL(s), instead of multiple spaces.
  • Changed skt2cdf tool program to allow handling a skeleton table directly from Windows (with rn at the end in each line) on non-Windows systems.
  • Added new options to cdfconvert tool program to
    • Remove non-varying dimension(s) from the source zVariable(s) if it does not have DEPEND_* attribute defined to the destination variable.
    • Replace any pad value(s) in a variable's data by its FILLVAL value, if FILLVAL attribute exists and has an equivalent data type as variable's.
  • Modified the tool programs to use FORMAT attribute to encode both data and metadata if the format is to be used. These include all C-based and Java-based tools.
  • A new option is added to cdf2skt tool to allow users to choose how to display variable's metadata and data, either with or witout format.
  • Modified the default encoded epoch data to be of ISO 8601 form.
  • Bugs fixed.
9-Jul-20 (V3.8.0.1)
  • Modified the CDF epoch breakdown functions that might cause incorrect day being returned.

So, you've decided to download an older version of Mac OS X. There are many reasons that could point you to this radical decision. To begin with, some of your apps may not be working properly (or simply crash) on newer operating systems. Also, you may have noticed your Mac's performance went down right after the last update. Finally, if you want to run a parallel copy of Mac OS X on a virtual machine, you too will need a working installation file of an older Mac OS X. Further down we'll explain where to get one and what problems you may face down the road.

A list of all Mac OS X versions

We'll be repeatedly referring to these Apple OS versions below, so it's good to know the basic macOS timeline.

Cheetah 10.0Puma 10.1Jaguar 10.2
Panther 10.3Tiger 10.4Leopard 10.5
Snow Leopard 10.6Lion 10.7Mountain Lion 10.8
Mavericks 10.9Yosemite 10.10El Capitan 10.11
Sierra 10.12High Sierra 10.13Mojave 10.14
Catalina 10.15

STEP 1. Prepare your Mac for installation

Given your Mac isn't new and is filled with data, you will probably need enough free space on your Mac. This includes not just space for the OS itself but also space for other applications and your user data. One more argument is that the free space on your disk translates into virtual memory so your apps have 'fuel' to operate on. The chart below tells you how much free space is needed.

Note, that it is recommended that you install OS on a clean drive. Next, you will need enough disk space available, for example, to create Recovery Partition. Here are some ideas to free up space on your drive:

  • Uninstall large unused apps
  • Empty Trash Bin and Downloads
  • Locate the biggest files on your computer:

Go to Finder > All My Files > Arrange by size
Then you can move your space hoggers onto an external drive or a cloud storage.
If you aren't comfortable with cleaning the Mac manually, there are some nice automatic 'room cleaners'. Our favorite is CleanMyMac as it's most simple to use of all. It deletes system junk, old broken apps, and the rest of hidden junk on your drive.

Download CleanMyMac for OS 10.4 - 10.8 (free version)

Download CleanMyMac for OS 10.9 (free version)

Download CleanMyMac for OS 10.10 - 10.14 (free version)

STEP 2. Get a copy of Mac OS X download

Normally, it is assumed that updating OS is a one-way road. That's why going back to a past Apple OS version is problematic. The main challenge is to download the OS installation file itself, because your Mac may already be running a newer version. If you succeed in downloading the OS installation, your next step is to create a bootable USB or DVD and then reinstall the OS on your computer.

How to download older Mac OS X versions via the App Store


If you once had purchased an old version of Mac OS X from the App Store, open it and go to the Purchased tab. There you'll find all the installers you can download. However, it doesn't always work that way. The purchased section lists only those operating systems that you had downloaded in the past. But here is the path to check it:

  1. Click the App Store icon.
  2. Click Purchases in the top menu.
  3. Scroll down to find the preferred OS X version.
  4. Click Download.

This method allows you to download Mavericks and Yosemite by logging with your Apple ID — only if you previously downloaded them from the Mac App Store.

Without App Store: Download Mac OS version as Apple Developer

If you are signed with an Apple Developer account, you can get access to products that are no longer listed on the App Store. If you desperately need a lower OS X version build, consider creating a new Developer account among other options. The membership cost is $99/year and provides a bunch of perks unavailable to ordinary users.

Nevertheless, keep in mind that if you visit developer.apple.com/downloads, you can only find 10.3-10.6 OS X operating systems there. Newer versions are not available because starting Mac OS X Snow Leopard 10.7, the App Store has become the only source of updating Apple OS versions.

Purchase an older version of Mac operating system

You can purchase a boxed or email version of past Mac OS X directly from Apple. Both will cost you around $20. For the reason of being rather antiquated, Snow Leopard and earlier Apple versions can only be installed from DVD.

Buy a boxed edition of Snow Leopard 10.6
Get an email copy of Lion 10.7
Get an email copy of Mountain Lion 10.8

The email edition comes with a special download code you can use for the Mac App Store. Note, that to install the Lion or Mountain Lion, your Mac needs to be running Snow Leopard so you can install the newer OS on top of it.

How to get macOS El Capitan download

If you are wondering if you can run El Capitan on an older Mac, rejoice as it's possible too. But before your Mac can run El Capitan it has to be updated to OS X 10.6.8. So, here are main steps you should take:

1. Install Snow Leopard from install DVD.
2. Update to 10.6.8 using Software Update.
3. Download El Capitan here.

'I can't download an old version of Mac OS X'

If you have a newer Mac, there is no physical option to install Mac OS versions older than your current Mac model. For instance, if your MacBook was released in 2014, don't expect it to run any OS released prior of that time, because older Apple OS versions simply do not include hardware drivers for your Mac.

But as it often happens, workarounds are possible. There is still a chance to download the installation file if you have an access to a Mac (or virtual machine) running that operating system. For example, to get an installer for Lion, you may ask a friend who has Lion-operated Mac or, once again, set up a virtual machine running Lion. Then you will need to prepare an external drive to download the installation file using OS X Utilities.

After you've completed the download, the installer should launch automatically, but you can click Cancel and copy the file you need. Below is the detailed instruction how to do it.

Epoch Ravine (alpha) Mac OS

STEP 3. Install older OS X onto an external drive

Epoch Ravine (alpha) Mac Os Download

The following method allows you to download Mac OS X Lion, Mountain Lion, and Mavericks.

  1. Start your Mac holding down Command + R.
  2. Prepare a clean external drive (at least 10 GB of storage).
  3. Within OS X Utilities, choose Reinstall OS X.
  4. Select external drive as a source.
  5. Enter your Apple ID.

Now the OS should start downloading automatically onto the external drive. After the download is complete, your Mac will prompt you to do a restart, but at this point, you should completely shut it down. Now that the installation file is 'captured' onto your external drive, you can reinstall the OS, this time running the file on your Mac.

  1. Boot your Mac from your standard drive.
  2. Connect the external drive.
  3. Go to external drive > OS X Install Data.

Locate InstallESD.dmg disk image file — this is the file you need to reinstall Lion OS X. The same steps are valid for Mountain Lion and Mavericks.

How to downgrade a Mac running later macOS versions

If your Mac runs macOS Sierra 10.12 or macOS High Sierra 10.13, it is possible to revert it to the previous system if you are not satisfied with the experience. You can do it either with Time Machine or by creating a bootable USB or external drive.
Instruction to downgrade from macOS Sierra

Epoch Ravine (alpha) Mac OS

STEP 3. Install older OS X onto an external drive

Epoch Ravine (alpha) Mac Os Download

The following method allows you to download Mac OS X Lion, Mountain Lion, and Mavericks.

  1. Start your Mac holding down Command + R.
  2. Prepare a clean external drive (at least 10 GB of storage).
  3. Within OS X Utilities, choose Reinstall OS X.
  4. Select external drive as a source.
  5. Enter your Apple ID.

Now the OS should start downloading automatically onto the external drive. After the download is complete, your Mac will prompt you to do a restart, but at this point, you should completely shut it down. Now that the installation file is 'captured' onto your external drive, you can reinstall the OS, this time running the file on your Mac.

  1. Boot your Mac from your standard drive.
  2. Connect the external drive.
  3. Go to external drive > OS X Install Data.

Locate InstallESD.dmg disk image file — this is the file you need to reinstall Lion OS X. The same steps are valid for Mountain Lion and Mavericks.

How to downgrade a Mac running later macOS versions

If your Mac runs macOS Sierra 10.12 or macOS High Sierra 10.13, it is possible to revert it to the previous system if you are not satisfied with the experience. You can do it either with Time Machine or by creating a bootable USB or external drive.
Instruction to downgrade from macOS Sierra

Instruction to downgrade from macOS High Sierra

Instruction to downgrade from macOS Mojave

Instruction to downgrade from macOS Catalina

Before you do it, the best advice is to back your Mac up so your most important files stay intact. In addition to that, it makes sense to clean up your Mac from old system junk files and application leftovers. The easiest way to do it is to run CleanMyMac X on your machine (download it for free here).

Visit your local Apple Store to download older OS X version

If none of the options to get older OS X worked, pay a visit to nearest local Apple Store. They should have image installations going back to OS Leopard and earlier. You can also ask their assistance to create a bootable USB drive with the installation file. So here you are. We hope this article has helped you to download an old version of Mac OS X. Below are a few more links you may find interesting.





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