TweetFollow Us on Twitter

Fractuals
Volume Number:1
Issue Number:11
Column Tag:Fortran's World

Fractuals in Fortran 2.1

By Chuck Bouldin, Physicist, National Bureau of Standards

A Look at MacFortran 2.1

Last month's issue contained a first look at Macfortran, an implementation of FORTRAN on the Macintosh. This article is intended to continue that discussiion, and specifically to look at the new features in the 2.1 release of Macfortran and to begin to explore the Macfortran interface to the Toolbox routines. This article will describe the new Toolbox capabilities in the 2.1 release, the extensions and improvements to FORTRAN in 2.1 and give a couple of short examples which begin to show how Macfortran interacts with the Macintosh environment. It will discuss the strengths (and weaknesses) of this implementation of FORTRAN, and show what this language can accomplish on the Macintosh.

Why Fortran?

One of the first things to determine about any computer language is the class of problems for which it is best suited. There are lots of languages now available for the Macintosh; we need to determine where FORTRAN fits into the hierarchy of tools available for programming the Mac. Please note that this is not intended to continue the meaningless debate about the 'best' computer language, rather this intended to be a (reasonably) realistic assesment of FORTRAN as a tool on the Mac.

First of all, there exists a very clear definition of the language. The American National Standards Institute (ANSI) has published a document which completely defines the FORTRAN 77 language. Any implementation of the language must meet the standards defined by ANSI, or it really isn't FORTRAN. In the past, the main problem with microcomputer implementations of FORTRAN has been that they were incomplete, including only a part of the ANSI standard. MacFortran is a refreshing break from the past; it implements the full ANSI definition of the language. Since the language is so clearly defined, this makes for a remarkable degree of software portability. Code written in FORTRAN on any other machine, micro or mainframe, ports easily to the Macintosh. Obviously, Macintosh extensions such as Toolbox calls will not be of much use on other machines, but the other parts of the code are standard. Details on the Toolbox interface and porting FORTAN from other machines to the Mac are given later.

Second, MacFortran is the only fully compiled language for the Macintosh other than C. This means that when an application must run fast, then the high level language possibilities are C or FORTRAN. In some ways FORTRAN represents a natural upgrade from Basic when speed is a concern, since Basic was first derived as a subset of FORTRAN. Basic programmers who find they need faster running programs will probably find it easier to convert to FORTRAN than to learn C.

Third, if you crunch numbers, this is your language. MacFortran does not use SANE, the 80 bit software floating point built into the Mac. MacFortran has its own floating point; 32 bit single precision and 64 bit double precision. This floating point is fast, easily the fastest available on the Macintosh. Specific benchmarks are given below.

The language does has limitations, which show up mostly in the ancient lineage of FORTRAN. The most glaring limitation is the inability to create data types which correspond to Pascal records or C structures. The closest that MacFortran comes to this is simple arrays. This means that when dealing with complex data structures, the programmer, rather than the compiler, is forced to do some of the bookkeeping about where various data elements are located.

Toolbox Support

Of course the crucial element of a language for the Macintosh is how well it can interface to the Toolbox routines provided in the Mac ROMS. MacFortran provides direct access to almost all of the Toolbox routines, including Quickdraw, access to serial ports, Window and Menu creation, the font manager, the standard file package, Text edit, use of Desk accesories from inside FORTRAN programs, and more. Missing so far are access to the control and memory manager. Although not all of the Toolbox is directly supported from FORTRAN, MacFortran allows calls to assembly language subroutines which can obviously access any routine.

MacFortran calls Macintosh routines through a single subroutine, TOOLBX. The first parameter passed to this subroutine is an upper case character string which is the name of the Mac routine being called. The parameters which follow are the arguments that the Mac routine needs. TOOLBX is a 'glue' routine which takes care of putting the arguments onto the stack or into the cpu registers.

There is one main complication in using MacFortran to access Mac Toolbox routines. As mentioned earlier, FORTRAN does not support data types such as Pascal records or C structures. Since such data structures are used by many of the Toolbox routines, how can these routines be supported from MacFortran? The answer is simple, the data structures are just mapped onto a MacFortran array, and the array is then passed to TOOLBX, which handles the mapping from array elements onto stack locations or 68000 registers. With this type of approach, MacFortran can handle all of the Mac Toolbox with equal facility.

Using MacFortran

The MacFortran system comes with compiler, linker, librarian, and source code debugger. Apple's Edit and Rmaker programs are also included. The compiler and debugger have full Mac-style interfaces with pull-down menus and the usual dialogue boxes for file selection and compiler options. Suprisingly, the linker and librarian retain Unix type interfaces.

The compiler is organized into 3 overlays: (1) parsing and preliminary reduction of tokens into object code, (2) resolution of backwards jumps and some final code generation (3) setting up pointers for a runtime linkage. The overall compilation speed for large programs is 500-1000 lines/minute. Due to disc overhead swapping the compiler overlays, small programs (under 100 lines) will seem much slower, perhaps 50-200 lines/minute.

As mentioned above, the third compiler pass actually sets up pointers for a runtime link. In a program which does not call previously compiled subroutines this justs sets a pointer to load the MacFortran runtime library. At runtime, the library and any other needed subroutines, will be autoloaded when called. At runtime, first the default disc and then the internal disc are searched for needed subroutines. During development, this saves having to crank up the linker every time a change is made in the code. On the down side, subroutines are not locked in memory after they are called once; they are reloaded at each call. Clearly, you don't want runtime linking for subroutines which are called more than a few times. Also, the search path can lead to some confusion. If an application program is executed from the internal drive and the runtime library is in the external drive, the runtime library is not found, since the internal drive is now also the default drive. The internal drive is first searched as the internal drive and then as the default drive, missing the runtime library. [Isn't this a bug? -Ed.]

Easily the most impressive component of the package is the source code Debugger. This utility brings up a window of the MacFortran source code being debugged, a window to display variables and a 5 line MacFortran output window. The source code can be single stepped, breakpoints can be set and changed, and variables can be continuously monitored. This is almost like having a FORTRAN interpreter! Getting code working is very greatly simplified by this debugger.

The linker and librarian are certainly functional, but do not have a Macintosh type interface. The worst part of this is having to remember file names. On the plus side, the linker supports creation of 'scripts', files which contain canned linker 'programs'. This simplifies linking since many of the same libraries and subroutines are linked to different programs. According to Absoft there are two reasons for the non-Mac interface: (1) to provide the large table space that the linker needs and still fit into a 128K machine it was necessary to use a primitive interface, and (2) the interface remained unchanged in 2.1 since the programming effort was put into changing the linker to support linking on an entry point, rather than a filename basis. In 2.0, the ENTRY statement in FORTRAN was effectively disenfranchised since linking was done on only a filename basis. I still don't like the user interface, but the functionality of supporting the ENTRY statement is certainly more important. [In otherwords, the linker isn't finished yet! -Ed.]

The linker also makes no discrimination about what parts of the runtime library are actually used by a program; the entire library is linked in regardless. This means that the smallest MacFortran program will be about 18K, a real detriment to writing desk accessories in this language. On the other hand, several programs can be completely linked except for the runtime libary and share a single copy of the runtime library through runtime linking. Also, applications that do anything more involved than "hello, world" are likely to bring in large fractions of the Runtime library anyway. Runtime linking is certainly not required. The linker and librarian manage pre-compiled object code and standalone applications are easily created.

Portability Considerations

As mentioned earlier, one of the main attractions of FORTRAN is the portability of the language. I have ported several large applications down from a VAX 11/780 and have learned some of the pitfalls to watch out for when porting code down to the Mac. Since the use of existing code, particularly mathematical software, is a major incentive for using Macfortran, it is worth describing the portability considerations in detail. All of the non-portable code that I have downloaded to the Mac has turned out to be due to the use of non-standard features in VAX FORTRAN.

First, it is essential to use the SAVE statement in order to preserve variables between calls to a subroutine. This was mentioned in last months column, but the impression was given that this is a quirk of Macfortran. It is not. It is standard FORTRAN, although VAX and most mainframes do not require it. On a small machine such as the Macintosh, the use of the SAVE statement allows you to write larger programs by disposing of unneeded variable space. The main caution is that COMMON blocks must be SAVE-d between calls to a subroutine. This is conterintuitive, but it is standard FORTRAN.

Second, DATA statements must follow all declarations (REAL, COMPLEX, etc.). Again, this is standard FORTRAN, but is relaxed on most large machines. The main place to look out for this is when using INCLUDE statements to enter the COMMON variables in a group of subroutines that share COMMON blocks.

Third, watch out for READ/WRITE statements that use system dependent logical units. The way to avoid this problem is to use PARAMETER statements to assign logical units. For instance, to avoid the problems described last month with units 5 and 6 in Macfortran I use on the Macintosh:

LU6=9
LU5=9
WRITE(LU6,*)
READ(LU5,*)

On the VAX I use the same code, but set:

LU5=5
LU6=6

It is also possible to use the compiler option which maps READ* and PRINT* statements to unit 9 to resolve all the problems associated with list directed READ and WRITE statements.

Extensions and Enhancements in 2.1

The major news for the 2.1 revision is that the compiler has been licensed to Microsoft. This should mean that there will now develop a much larger user community for this language. In evaluating the 2.1 revision I have been working from a (slightly) modified version of the 2.0 documentation. According to Absoft, the new manual has been completely rewritten by Microsoft, and is much more Mac specific than the old documentation. The manual is 400 pages, organized into a Users guide and a Reference manual. It also reflects an orientation towards a less sophisticated user with less prior knowledge of FORTRAN.

In addition to Macintosh specific enhancements, there are some extensions in the Absoft FORTRAN which are very nice. Probably the most powerful is the addition of recursion to the language. Some programs are very difficult to write without recursion and are very natural when recursion is used. As an example of recursion, and to illustrate the drawing speed of Macfortran a short example which draws fractals is given below.

Other extensions include a CASE statement for multi-way branches, DO loops that are terminated with a REPEAT statement, and a generalized looping statement, WHILE(condition)....REPEAT. The WHILE statement is especially useful, since it gives much more flexible looping to FORTRAN; one no longer has to map all loops onto arithmetic progressions.

The compiler still operates in the same way as before. The user selects a file from the standard file box and then chooses among options such as Compile, Compile and Execute, Compile and Debug, etc. A nice human engineering change is that the compiler options can now be saved so that they do not need to be reset after every compile. The user still has to explicitly choose an option before anything happens. I do not find this flexibility confining.

The standard file package, Text edit utilities, and Desk accessory support (Systemclick and Systemtask) are now accessible from Fortran. The glaring things still missing are access to the Control and memory managers. By using the compile to assembly source to observe what code is generated for, say, the Window Manager it should be possible to figure out what to do for the Control Manager. It is aggravating to have to do this; hopefully we will soon get full documentation on all the Toolbox.

There is now a compiler option to map lower case onto upper case. This is very useful since only upper case characters are recognized by an ANSI standard compiler. Differences betwen VAX and Macfortran about character case have caused problems porting code. This option switch solves those problems.

There are several new demo programs, including a Fortran version of the Edit program from Inside Macintosh. On the subject of Edit, it is not Absoft's fault that the MDS Editor contains hardwired references to its transfer points. This is not even a resource that can be changed with the resource editor! Instead, references to EXEC, etc. are embedded in the code in the MDS Editor. The simple (but not elegant) solution is to rename Fortran as EXEC on the desktop. This allows transfers back and forth between Macfortran and Edit.

There is now access to the A5 register and Quickdraw globals via a call to GETGLOBALS.

Performance

As mentioned earlier, one reason for using this language is speed. The code is fully translated into 68000 object code for fast execution. For instance, the Sieve of Eratosthenes runs in 6.8 seconds, about as fast as Mac C compilers (without register variables). It is harder to find such universal benchmarks for floating point, but MacFortran executes single precision floating point 5-10 times faster than Mac languages that use the 80 bit SANE package. Some of the Mac C compilers also have their own floating point packages, but MacFortran is 2 times faster than the fastest of these.

To give some idea of floating point speed I ran two benchmarks that have had some runs on other machines (mostly IBM and clones). I ran Jerry Pournelle's benchmark which fills and multiplies two 20x20 matrices, with an execution time of 2.9 seconds. This is very fast, since an 8 Mhz 8088 with 8087 runs the same benchmark in 3.9 seconds using Pascal MT+. In addition, I ran the benchmark 'float' from the Aug, 85 issue of Byte magazine, page 133. Here, an IBM XT with 8087 recorded a time of 11.7 seconds using Microsoft Fortran and an IBM AT with an 80287 and Digital Research Fortran came in at 17.7 seconds. Using MacFortran, the Macintosh comes in at 7.7 seconds. When compared to a VAX 11/780 for large application programs such as matrix inversion, Fourier transforms, and optical ray tracing Macfortran delivers about 4-7% of the 780 performance. Of course, what a user cares about is how long he waits for the results. On a moderately loaded VAX I find that the difference in execution time drops to a factor of 2-5 between the Mac and the VAX.

I won't belabor the comparisons any more since the conclusion is clear; MacFortran is very, very fast for floating point operations. For a reasonable mix of floating and fixed point operations, MacFortran is at least as fast as any other language on the Mac. It is also faster than the main microcomputer competitor even when compared with hardware floating point. For crunching numbers, this language is unbeatable.

There are some caveats. The above benchmarks compare the default precision of each language. In MacFortran this is 32 bit single precision, providing only 5-6 decimal digits of accuracy, so is it 'fair' to compare this with the 80 bit software floating point of SANE or the 80 bit hardware floating point of the 8087? Yes, it is. Languages which do all floating point as 80 bit calculations give the user no choice, frequently providing more precision than is needed. In MacFortran you choose; if you need more accuracy, use double precision (64 bit), while if speed is the main concern, stay with single precision. Usually single precision is fine.

A Pair of Examples

The examples below are intended to illustrate a small part of the Macfortran interface to the Mac Toolbox routines. These show about the simplest level at which a FORTRAN program can interface with the Macintosh. The 'user interface' in these examples is not via Menus and dialogue boxes, but these routines do show off the graphics capability available from Macfortran and illustrate the use of recursion for drawing fractals (see Aug, 85 Macworld for the same example in MacPascal).

 program ranplt
*
* This illustrates the use of some Quickdraw routines for 
*  plotting on the screen and erasing areas of the screen. This
*  routine is intended to show the drawing speed on the screen
* and to illustrate the use of the internal random number
* generator, TOOLBX(RANDOM). Since the coordinate arrays
* are filled before plotting starts, this routine gives a measure
* of the raw plotting speed from inside Macfortran. Toolbox
*  routines used are:

* ERASERECT
* RANDOM
* LINE
* MOVETO

* Storage for the starting position
      INTEGER XSTART
      INTEGER YSTART
      
* For random coordinates
      INTEGER*4 IXRAND(3000), IYRAND(3000)
      INTEGER*4 TOOLBX
      
* Declarations for calculating elapsed time for plot
      INTEGER TIME1, TIME2
      
* Include the Toolbox Call Parameter file.
      INCLUDE TOOLBX.PAR
      
* Rectangle stuff for erasing the screen
      INTEGER*2 BIGRECT(4), SMLRECT(4)
      DATA BIGRECT /0,0,512,512/
      DATA SMLRECT /0,0,60,100/

*Stuff default values for NSTEPS and ISCALE
      NSTEPS = 1000
      ISCALE = 6
      
* Set up number of steps and stepsize
      PRINT*, 'Number of steps ? (3000 maximum, 1000 default)'
      READ*,   NSTEPS
      PRINT*,'Approximate step size in pixels ? (5 default)'
      READ*, ISCALE
      ISCALE = 32000 / ISCALE

* Clear the screen
      CALL TOOLBX(ERASERECT,BIGRECT)

* Get the starting time (in ticks)
* Note that this is a system global!
      TIME1=LONG(362)

* Stuff the random coordinate arrays
* TOOLBX(RANDOM) returns a random integer between 
* -32768 and 32767, inclusive
      DO ( I=1,NSTEPS )
        IXRAND(I) = TOOLBX(RANDOM) / ISCALE
        IYRAND(I) = TOOLBX(RANDOM) / ISCALE
      REPEAT

* Move to center of screen
        XSTART = ( BIGRECT(1) + BIGRECT(3) ) / 2
        YSTART = ( BIGRECT(2) + BIGRECT(4) ) / 2
        CALL TOOLBX (MOVETO,XSTART,YSTART)

* Draw the next line.
        DO ( I=1, NSTEPS )
          CALL TOOLBX (LINE,IXRAND(I),IYRAND(I) )
        REPEAT

* Get the ending time and print deltat
      CALL TOOLBX(ERASERECT,SMLRECT)
      CALL TOOLBX(MOVETO,10,10)
      
* Ending time in ticks
      TIME2 = LONG(362)
      DELTAT = (TIME2 - TIME1) / 60.
      PRINT*,'ELAPSED TIME = ',DELTAT
      PAUSE
      END

         program snowflake
* Draws a fractal pattern using Toolbox calls and recursion.
* Calls
* ERASERECT
* MOVETO
* LINETO
*
      include quickdraw.inc
      integer x1,y1,x2,y2,n
      integer xorig,yorig,scaling
      integer*2 rect(4)
      xorig = 250
      yorig = 230
      scaling = 100
      rect(1)=0; rect(2)=0; rect(3)=340; rect(4)=510
      do
        call toolbx(ERASERECT,rect)
        call toolbx(MOVETO,3,12)
        type "order= (0 to quit)"; accept n
        if(order.eq.0) then 
           go to 20
        endif
        call toolbx(ERASERECT,rect)
        x1 =  xorig - scaling
        y1 =  yorig
        x2 =  xorig + scaling
        y2 =  yorig
        call snowr(x1,y1,x2,y2,n)
        pause
        repeat
  20  continue  
     end
 
      subroutine snowr(x1,y1,x12,y12,n)
      include quickdraw.inc
      integer x1,y1,x12,y12,n
      integer xdiff,ydiff,x(2:12),y(2:12)
      s = 0.5573
      x(12) = x12
      y(12) = y12
      xdiff = x12 - x1
      ydiff = y12 - y1
      x(10) = x1 + xdiff/3
      y(10) = y1 + ydiff/3
      x(11) = x1 + xdiff*2/3
      y(11) = y1 + ydiff*2/3
      x(3)  = x(10) + ydiff*s
      y(3)  = y(10) - xdiff*s
      x(9)  = x(10) + ydiff*s/3.0
      y(9)  = y(10) - xdiff*s/3.0
      x(8)  = x(10) + ydiff*s*2.0/3.0
      y(8)  = y(10) - xdiff*s*2.0/3.0
      x(2)  = (x1+x(3))/2
      y(2)  = (y1+y(3))/2
      x(4)  = x(11) + ydiff*s
      y(4)  = y(11) - xdiff*s
      x(6)  = x(11) + ydiff*s*2.0/3.0
      y(6)  = y(11) - xdiff*s*2.0/3.0
      x(5)  = (x12+x(4))/2
      y(5)  = (y12+y(4))/2
      x(7)  = (x(8)+x(4))/2
      y(7)  = (y(8)+y(4))/2
      if (n=1) then
         call toolbx(MOVETO,x1,y1)
         do (i=2,11)
           call toolbx(LINETO,x(i),y(i))
         repeat
         call toolbx(LINETO,x12,y12)
      else
      call snowr(x(2),y(2),x1,y1,n-1)
      call snowr(x(2),y(2),x(3),y(3),n-1)
      call snowr(x(3),y(3),x(4),y(4),n-1)
      call snowr(x(4),y(4),x(5),y(5),n-1)
      call snowr(x(5),y(5),x(6),y(6),n-1)
      call snowr(x(7),y(7),x(6),y(6),n-1)
      call snowr(x(7),y(7),x(8),y(8),n-1)
      call snowr(x(9),y(9),x(8),y(8),n-1)
      call snowr(x(9),y(9),x(10),y(10),n-1)
      call snowr(x(11),y(11),x(10),y(10),n-1)
      call snowr(x(11),y(11),x(12),y(12),n-1)
    end if
   end
 

Community Search:
MacTech Search:

Software Updates via MacUpdate

Shimo 4.0 - VPN Client for Mac – for Eve...
Shimo is the most versatile VPN client for OS X and it enables really everybody to master secure network. It supports more protocols than any other VPN application out there! CiscoVPN, AnyConnect,... Read more
Capo 3.3 - Slow down and learn to play y...
Capo lets you slow down your favorite songs so you can hear the notes and learn how they are played. With Capo, you can quickly tab out your songs atop a highly-detailed OpenCL-powered spectrogram... Read more
MacUpdate Desktop 6.0.8 - Search and ins...
MacUpdate Desktop 6 brings seamless 1-click installs and version updates to your Mac. With a free MacUpdate account and MacUpdate Desktop 6, Mac users can now install almost any Mac app on macupdate.... Read more
BitTorrent Sync 2.1.1 - Sync files secur...
BitTorrent Sync allows you to sync unlimited files between your own devices, or share a folder with friends and family to automatically sync anything. File transfers are encrypted. Your information... Read more
Quicksilver 1.3.0 - Application launcher...
Quicksilver is a light, fast and free Mac application that gives you the power to control your Mac with keystrokes alone. Quicksilver allows you to find what you need quickly and easily, then act... Read more
iWatermark Pro 1.72 - Easily add waterma...
iWatermark Pro is the essential watermarking app for professional, business, and personal use. iWatermark, is the number 1 and only watermarking tool available for all 4 platforms iPhone/iPad, Mac,... Read more
RapidWeaver 6.3 - Create template-based...
RapidWeaver is a next-generation Web design application to help you easily create professional-looking Web sites in minutes. No knowledge of complex code is required, RapidWeaver will take care of... Read more
Adobe Photoshop CC 2015 16.0.1 - Profess...
Photoshop CC 2015 is available as part of Adobe Creative Cloud for as little as $19.99/month (or $9.99/month if you're a previous Photoshop customer). Photoshop CS6 is still available for purchase (... Read more
Together 3.4.6 - Store and organize all...
Together helps you organize your Mac, giving you the ability to store, edit and preview your files in a single clean, uncluttered interface. Smart storage. With simple drag-and-drop functionality,... Read more
Monosnap 3.1.0 - Versatile screenshot ut...
Monosnap lets you capture screenshots, share files, and record video and .gifs! Capture: Capture full screen, just part of the screen, or a selected window Make your crop area pixel perfect with... Read more

.Decluster Zero: Bullet Nocturne (Games...
.Decluster Zero: Bullet Nocturne 1.0.1 Device: iOS Universal Category: Games Price: $2.99, Version: 1.0.1 (iTunes) Description: LAUNCH SALE, 40% off for a limited time -- .Decluster is a Guide for Your Bullet-Hell Dream Tonight --... | Read more »
Five Nights at Freddy's 4 has Been...
In keeping with tradition, Five Nights at Freddy's 4 has made its way to the App Store with zero warning fanfare. Honestly I'd be disappointed it if happened any other way at this point. [Read more] | Read more »
Doom & Destiny Advanced (Games)
Doom & Destiny Advanced 2.3.4.0 Device: iOS Universal Category: Games Price: $.99, Version: 2.3.4.0 (iTunes) Description: ---SUPER GIGA LAUNCH DISCOUNT! Get it now for cheap or pay more later!---An additional 143 MB download is... | Read more »
Five Nights at Freddys 4 (Games)
Five Nights at Freddys 4 1.0 Device: iOS Universal Category: Games Price: $2.99, Version: 1.0 (iTunes) Description: This time, the terror has followed you home. | Read more »
This Week at 148Apps: July 27-31, 2015
Winding Down July With 148Apps How do you know what apps are worth your time and money? Just look to the review team at 148Apps. We sort through the chaos and find the apps you're looking for. The ones we love become Editor’s Choice, standing out... | Read more »
You'll Want to Keep an Eye Out for...
If you're the kind of person who had fun hunting down and completing all the codex puzzles in Assassin's Creed 2, then are you ever in for a treat. The Guides looks like it's going to be a very robust collection of similarily odd, seemingly... | Read more »
Vivid Games has Announced Real Boxing 2...
The original Real Boxing was a pretty impressive bit of fisticuffs, but if the trailer Vivid Games is showing off for GamesCom is any indication Real Boxing 2 is going to be even better. [Read more] | Read more »
PAC-MAN Championship Edition DX - Tips,...
[Read more] | Read more »
Card King: Dragon Wars - Tips, Tricks an...
[Read more] | Read more »
Pac-Man Championship Edition DX has brou...
Bandai Namco has released Pac-Man Championship Edition DX on iOS and Android, which features the classic arcade gameplay that we've all grown to love. Pac-Man Championship Edition DX can be enjoyed in much shorter bursts than the arcade versions... | Read more »

Price Scanner via MacPrices.net

Back to School Time: Outline for iPad Goes Fr...
Sacramento, California based Gorillized Corporation has announced a “Back to School” offer; the iPad version of Outline goes free for August 3-5. Outline is a smart digital notebook for iPad that... Read more
MacBook 12 Retina Pundit’s New Favorite Mac
If you’re eyeing the purchase of a new 12-inch Retina MacBook, but wondering if you can live with a single USB-C port, 2011-level CPU performance, and the unorthodox keyboard, you should find... Read more
15-inch 2.2GHz Retina MacBook Pro on sale for...
Adorama has the 2015 15″ 2.2GHz Retina MacBook Pro on sale for $184 off MSRP including free shipping plus NY & NJ sales tax only: - 15″ 2.2GHz Retina MacBook Pro: $1815 $184 off Adorama will also... Read more
PDF Element Tool Kit For PDF For Windows 10,...
South Surrey, British Columbia based software developer Wondershare has posted an interesting infographic tracking the development of Microsoft’s flagship Windows operating system over the years,... Read more
27-inch 3.5GHz 5K iMac on sale for $81 off MS...
Adorama has the 27″ 3.5GHz 5K iMac on sale for $2218, $81 off MSRP, including a free copy of Apple’s 3-Year AppleCare Protection Plan. Shipping is free, and Adorama charges sales tax in NY & NJ... Read more
Back-to-School with Tablet and Smartphone Acc...
Belkin helps you prepare for the coming school year with a wide variety of the latest mobile and tablet accessories to outfit both grade school and college students. The line-up includes charging... Read more
11-inch MacBook Airs on sale for $100 off MSR...
Best Buy has 11-inch MacBook Airs on sale for $100 off MSRP. Choose free shipping or free local store pickup (if available). Sale prices for online orders only, in-store prices may vary: - 11″ 1.6GHz... Read more
iPad Air 2 on sale for up to $100 off MSRP
Best Buy has iPad Air 2s on sale for up to $100 off MSRP on their online store for a limited time. Choose free shipping or free local store pickup (if available). Sale prices available for online... Read more
Sale! 13-inch MacBook Pros on sale for $100 o...
B&H Photo has 13″ MacBook Pros on sale for $100 off MSRP. Shipping is free, and B&H charges NY sales tax only: - 13″ 2.5GHz/500GB MacBook Pro: $999.99 save $100 - 13″ 2.7GHz/128GB Retina... Read more
Sale! Save $100 on 13-inch MacBook Airs this...
B&H Photo has the 13″ 1.6GHz/128GB MacBook Air on sale for $899.99 including free shipping plus NY tax only. Their price is $100 off MSRP, and it’s the lowest price available for this model.... Read more

Jobs Board

*Apple* Retail - Multiple Positions (US) - A...
Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, you're also the Read more
Infrastructure Engineer - *Apple* /Mac - Hil...
Infrastructure Engineer - Apple /Mac Job Code: 1608 # of openings: 1 Description Our fortune 500 client is looking to hire an experienced Infrastructure Engineer to join Read more
Executive Administrative Assistant, *Apple*...
…supporting presentation development for senior leadership. * User experience with Apple hardware and software is preferred. Additional Requirements The following list Read more
*Apple* Bus Company is now hirin - Apple Bus...
Apple Bus Company is now hiring school bus drivers in the Pettis County area. Class B CDL preferred. Free training provided. No nights or weekends required. Flexible Read more
*Apple* Certified Mac Technician - Updated 6...
…and friendly, hands-on technical support to customers troubleshooting and repairing Apple /Mac products with courtesy, speed and skill. Use your problem-solving skills Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.