TweetFollow Us on Twitter

System Queues
Volume Number:5
Issue Number:1
Column Tag:Forth Forum

System Queues

By Jörg Langowski, MacTutor Editorial Board

Note: Source code files accompanying article are located on MacTech CD-ROM or source code disks.

“Looking at system queues”

The utility that I’m going to describe this month can be used to look at various queues of the Macintosh operating system. I was always curious to know what’s going on in the background of my machine while I’m working away; that’s how this example came to be. At the same time, the program contains another example of popup menus (for which the correct trap call has been added in Mach2.14), and how to use the userData field in the user variable area to display messages in a task window.

A number of queues are maintained by the Mac operating system; the example won’t list all of them, but some of the more important ones. Queues are linked lists of information blocks. Each block contains the address of the next list element in its first four bytes, a 16-bit number indicating the queue type in its next 2 bytes, and variable length information thereafter, as indicated below:

Fig.1: general structure of a Macintosh queue

The first element of a queue is called the queue header and the last one the queue tail. The queue tail has a link address of zero, meaning no more elements will follow. One can access the elements of a queue through a pointer to its header which is usually kept in a low memory global variable. For some of the queues the tail’s location is kept in another global variable for faster access.

The low memory addresses of the queues that our utility will display - vertical blanking queue, volume control block queue, drive queue, file system queue, event queue, deferred task queue and time manager queue - are defined at the beginning of the listing. (Since the address of the TM queue is not given in IM, I dug it out of a disassembly of the _InsTime trap.)

Structure of the program

We’ll set up a Mach 2 terminal task that contains the usual Apple, File and Edit menus (for desk accessories). The task window will contain a bar display for each queue which gives a visual indication of the size of the queue. The display bars are ‘click-sensitive’; when the mouse is clicked on one of them, a popup menu is displayed which shows the name of the queue. When this name is selected, a second window will be opened with information about the queue elements. That second window will disappear on a mouse click.

Inter-task communication in Mach2

I was happily hacking away on the example, got the rectangles drawn in the right places, the popup menus setup (note the slight difference in the interface that’s used here - built-in - from my code in MT V4#4), when I got a row of bad bombs trying to write text into a second window from the queue-monitoring task. Just ADDing a new window, then doing a _SetPort and using the Mach2 text I/O routines wouldn’t work at all. When it finally dawned on me what was I actually doing? The main task detects a mouse down in the content region of its window and calls the content handler (see listing) to find out which rectangle it has been clicked in, which menu to display, and to output the text in the second window. Now that is a totally trivial piece of code in a single task program like one would write in C or Pascal most of the time. In Mach2, things are different.

The mouse down event is not detected by the task that is supposed to handle it, but by the (in)famous I-O task, present in any Mach2 application. That task calls WaitNextEvent, detects which window the mouse was clicked in, and calls the event handler of the task that owns the window. So while we’re executing the event handler, we’re actually in the context of the I-O task! The standard Mach2 console output would be sent to the window associated with the I-O task. Unfortunately, there is no such window - therefore bomb.

The bottom line is that you can’t use the Forth text I-O routines from event handlers that are called through the I-O task. You have to rely on the means that Mach2 provides to do inter-task communication and make a terminal task do the text output.

Mach2 text output from event handlers

How is this achieved? The User area of a Mach2 task contains two locations, UserData and UserVector. When a non-zero value is stored in UserData, the routine pointed to by UserVector will be executed. So all we need to do is define a user vector handling routine, and have the content handler of the task store some message in UserData.

The content handler of our main window simply stores the menu ID of the selected popup menu in UserData. The user vector handler finds this menu ID (it gets passed on the stack), and calls the corresponding queue display routine.

The queue display routines use a second window, qInfo. In order to have the output appear in that window and not on top of our bar display, we have to change the task window pointer momentarily; this is done by storing the qInfo window pointer in the user variable taskWindowPointer, doing the output and later restoring the original pointer.

Queues displayed

The utility displays seven queues (and you can easily add more): vertical blanking, volume control block, drive, event, file system, deferred task, and time manager queues, in that order. The display bars are not labeled, but the popup menu will show you the name of the queue when you click on a bar.

When a popup menu has been selected, a queue list is displayed in a second window. The first two columns are the element number and queue type for each list element. The remaining columns vary according to the queue displayed. For the VBL queue, the VBL procedure pointer, the tick count and the ‘phase’ are listed. The VCB queue gives the name of each mounted volume, its drive number, driver and volume reference numbers, total number of allocation blocks, allocation block size and free blocks. The drive queue will give the drive number, driver reference number, file system ID, total number of blocks, and the status of the drive (locked disk, disk inserted, single or double sided for floppies). The status information is kept in the four bytes preceding the queue element (see IM II-128).

The event queue listing contains the what, message, when, where, and modifiers fields of the event. However, I’m sorry to say that in this case the listing window is next to useless, because the list is always empty when it is displayed. I’ll let you think of a reason why. The bar display sometimes shows queued events, when the display window is brought to the front from a partially covered position (its activate and update events).

Since I never found any pending asynchronous file system requests, I could not test the display for the FS queue, so that display routine is empty, just like the deferred task display. The time manager queue list shows the procedure pointer and count field for each time manager task.

In my system (MacII, 80MB hard disk, 5 MB memory, Appletalk and file server installed) I found a total of 8 VBL tasks, 2 time manager tasks, 2 mounted volumes (hard disk and Alisashare volume), and, interestingly, 5 different drives. I could make sense of three drives (SCSI disk, floppy drive and Alisashare disk), and can guess that a fourth ‘drive’, with the same file system ID as the Alisashare volume, might have something to do with the server. The fifth entry, with a queue type of 3, file system ID of $43C, and driver reference number of zero, doesn’t make sense to me. If someone has something to say about that point I’d be happier.


The crucial question - what is this utility good for? Besides satisfying the general curiosity of a system hacker, one important thing that I can imagine it would be helpful in is the detection of - you guessed it - viruses. At least background routines that install VBL or time manager tasks to do their malicious job might be spotted a lot easier when the queue display suddenly starts changing.

I did not add information about working directory control blocks, but you may do so if you like. The working directory queue header pointer is at $372.

Mach2 news

Finally, Palo Alto Shipping has published a trap compiler that allows you to add new traps to the Mach2 system without writing assembly code. The code is freely accessible on the Mach2 GEnie roundtable, but for those of you who don’t have access to GEnie, I’m including it on the source code disk together with some trap fixes for version 2.14. Sorry we can’t print the complete code here because it is too long; also you’ll have a lot of glue code typed in and debugged before you have finished typing the trap compiler in by hand. I’ll nevertheless print a short extract of the description:

This utility allows you to define your own trap “glue.” Thus as new system traps become available, you will be able to define their high-level interface symbolically (without using assembly language). It will also allow you to define a substitute syntax to the CALL interface, in case you need to modify (fix?) one of the existing traps. Note that in the latter case, you do not actually change the existing CALL, you simply define a new syntax which can be used in place of the CALL sequence.

One might wonder whether it makes good sense to include a 2K utility in an application when all you need is a few trap calls (but, see my comments below). However, for casual use you might consider putting this code in your workspace, along with your commonly used constants, mach words, and other compiler utilities (that way they will always be available during your “experimental” sessions). If you are working on a serious application, I would suggest the following approach. Place all variables, mach words, and compiler utilities (such as this trap compiler) in a separate segment and when you finish your application use ResEdit to remove that very same segment from your finished application.

This will work because mach words, variables, and compiler utilities (such as this trap compiler) do NOT need to be in memory during the execution of the code which they produce. Generally speaking, any word which only produces in-line code, most immediate words, or any child word which does not reference its parent at run-time can safely be removed from a finished application. If you are really concerned about making the smallest possible applications, then this is a technique which you should always use (as a final step, when you are completely finished with your program). If it seems risky to remove a segment from a finished application, just remember that there is NO WAY you can run code in another segment if that segment has NO jump-table entries (i.e. if you can’t get to the code, why include it in your application?)

Mach words, variables, and (most) compiler words don’t use or create jump-table entries. This same principle is why you never have to mark mach words or variables as GLOBAL (there is one exception, if you write a CODE word which explicitly states “JSR <mach word>” or “LEA <mach word>” then the defined instance of that <mach word> must be in memory at run-time. Thus if <mach word> exists in another segment, it will need to be marked GLOBAL (however, it’s always ok to say LEA <variable> or MOVE.L <variable>, thus variables “never” need to be marked as GLOBAL).

Waymen @ PASC

Thanks for that utility and the comments on segmentation.

Till next month.

Listing 1: System queue display

\ mini task to display system queues
\ © 1988 J. Langowski / MacTutor

only forth also assembler also mac

$160 constant vblqhdr
$356 constant vcbqhdr
$308 constant drvqhdr
$14a constant evtqhdr
$360 constant fsqhdr
$d92 constant dtqhdr
$b30 constant timevars
$11c constant utablebase

 72 user taskwindowpointer
 92 user (type)
108 user taskmenubar
144 user uservector
148 user userdata
152 user content-hook
164 user goaway-hook
168 user update-hook
172 user activate-hook

 2 CONSTANT Message
14 CONSTANT Modifiers
 1 CONSTANT ActivateMask

300 constant appleid
301 constant fileid
302 constant editid

152 CONSTANT WrefCon

create rect1 20 w, 20 w, 90 w, 28 w,
create rect2 20 w, 35 w, 90 w, 43 w,
create rect3 20 w, 50 w, 90 w, 58 w,
create rect4 20 w, 65 w, 90 w, 73 w,
create rect5 20 w, 80 w, 90 w, 88 w,
create rect6 20 w, 95 w, 90 w, 103 w,
create rect7 20 w, 110 w, 90 w, 118 w,


NEW.MBAR queueBar

NEW.MENU AppleMenu
“ About Queues ...;(-” AppleMenu ITEMS

“ File” FileMenu TITLE
0 FileID FileMenu BOUNDS
“ Quit” FileMenu ITEMS

“ Edit” EditMenu TITLE
“ (Undo/Z;(-;(Cut/K;(Copy/C;(Paste/V;(Clear” EditMenu ITEMS

NEW.MENU vblmenu
“ vbl” vblmenu TITLE
-1 150 vblmenu BOUNDS
“ VBL Tasks;(-” vblmenu ITEMS

NEW.MENU vcbmenu
“ vcb” vcbmenu TITLE
-1 151 vcbmenu BOUNDS
“ Vol contrl blks;(-” vcbmenu ITEMS

NEW.MENU drvmenu
“ drv” drvmenu TITLE
-1 152 drvmenu BOUNDS
“ Drives;(-” drvmenu ITEMS

NEW.MENU evtmenu
“ evt” evtmenu TITLE
-1 153 evtmenu BOUNDS
“ Events [???];(-” evtmenu ITEMS

NEW.MENU fsmenu
“ fs” fsmenu TITLE
-1 154 fsmenu BOUNDS
“ File System;(-” fsmenu ITEMS

NEW.MENU dtmenu
“ dt” dtmenu TITLE
-1 155 dtmenu BOUNDS
“ Def Tasks;(-” dtmenu ITEMS

NEW.MENU tmmenu
“ tm” tmmenu TITLE
-1 156 tmmenu BOUNDS
“ Time manager;(-” tmmenu ITEMS

“ System Queues” SysQueue TITLE
250 50 350 250 SysQueue BOUNDS
Rounded Visible CloseBox GrowBox SysQueue ITEMS

“ Queue Info” qInfo TITLE
50 50 250 500 qInfo BOUNDS
NoGrow Invisible NoCloseBox NoGrowBox qInfo ITEMS

500 2000 terminal queues

CODE unpack
 MOVE.L (A6),D0
 CLR.L   D1
 CLR.W  D0
 MOVE.L D0,(A6)
 MOVE.L D1,-(A6)

: beep ( n )
 0 do 1 call sysbeep loop 

: wait { #ticks | time -- }
 call tickcount #ticks + -> time
 begin pause
 call tickcount time > 

: { menu pt | point -- menuID item# }
 pt -> point 
 ^ point call localtoglobal 
 menu @ point unpack 1
 call popupmenuselect

: do.content  {  | pt --  }
 CALL FrontWindow CALL SetPort
 qInfo call HideWindow
 EVENT-RECORD Where + @ -> pt
 ^ pt CALL GlobalToLocal

 pt rect1 CALL PtInRect
 IF drop vblmenu THEN
 pt rect2 CALL PtInRect
 IF drop vcbmenu THEN
 pt rect3 CALL PtInRect
 IF drop drvmenu THEN
 pt rect4 CALL PtInRect
 IF drop evtmenu THEN
 pt rect5 CALL PtInRect
 IF drop  fsmenu THEN
 pt rect6 CALL PtInRect
 IF drop  dtmenu THEN
 pt rect7 CALL PtInRect
 IF drop  tmmenu THEN
 ?dup IF ( rectangle was selected)

 IF   ( popup selection was made )
 ( menuID ) userData task-> queues !
: draw.rects
 rect1 call framerect
 rect2 call framerect
 rect3 call framerect
 rect4 call framerect
 rect5 call framerect
 rect6 call framerect
 rect7 call framerect

: clr.rects
 rect1 call eraserect
 rect2 call eraserect
 rect3 call eraserect
 rect4 call eraserect
 rect5 call eraserect
 rect6 call eraserect
 rect7 call eraserect

: blackBar { rect pixels | locBR locTL }
 rect ^ locTL 8 cmove
 ^ locBR w@ ( bottom ) pixels -
 ^ locTL w!
 ^ locTL call paintrect

: #elems { qhdr | elems -- #.of.queue.elements }
 0 -> elems
 2 +> qhdr
 qhdr @ ?dup while
 -> qhdr
 1 +> elems
: display.queues {  | -- }
 rect1 vblqhdr #elems 4* blackBar
 rect2 vcbqhdr #elems 4* blackBar
 rect3 drvqhdr #elems 4* blackBar
 rect4 evtqhdr #elems 4* blackBar
 rect5  fsqhdr #elems 4* blackBar
 rect6  dtqhdr #elems 4* blackBar
 rect7 timevars @ 8 + #elems 4* blackBar

: dsp.vbl { | qelemPtr n -- }
 qinfo “ Vertical Blanking Tasks” 
 call SetWTitle
 .” ----------------------------------------------------------------” 
 .” task# qtype  ProcPtr Count Phase” cr
 .” ----------------------------------------------------------------” 
 vblqhdr 2+ -> qelemptr
 1 -> n
 qelemptr @ ?dup while
 -> qelemptr
 n 3 .r 3 spaces 
 qelemptr 4 + w@ 5 .r space
 qelemptr 6 + @ 8 .r space
 qelemptr 10 + w@ 5 .r space
 qelemptr 12 + w@ 5 .r cr
 1 +> n 

: dsp.vcb { | qelemPtr n -- }
 qinfo “ Volume Control Blocks” 
 call SetWTitle
 .” --------------------------------------------------------------------------------------------------------------------------------------------------” 
 .”  vcb# qtype Volume name Drive dRef# vRef# #blks blksz free” cr
 .” --------------------------------------------------------------------------------------------------------------------------------------------------” 
 vcbqhdr 2+ -> qelemptr
 1 -> n
 qelemptr @ ?dup while
 -> qelemptr
 n 3 .r 3 spaces 
 qelemptr 4 + w@ 5 .r space
 qelemptr 44 + count dup rot swap type
 27 swap - spaces
 qelemptr 72 + w@ 5 .r space
 qelemptr 74 + w@ 5 .r space
 qelemptr 78 + w@ 5 .r space
 qelemptr 26 + w@ 5 .r space
 qelemptr 28 +  @ 5 .r space 
 qelemptr 42 + w@ 4 .r cr
 1 +> n 

: dsp.drv { | qelemPtr n -- }
 qinfo “ Drives” 
 call SetWTitle
 .” ------------------------------------------------------------------------------------------” 
 .”  drv# qtype Drive dRef# FSID    #blks l dd ss” cr
 .” ------------------------------------------------------------------------------------------” 
 drvqhdr 2+ -> qelemptr
 1 -> n
 qelemptr @ ?dup while
 -> qelemptr
 n 3 .r 3 spaces 
 qelemptr 4 + w@ 5 .r space
 qelemptr 6 + w@ 5 .r space
 qelemptr 8 + w@ 5 .r space
 qelemptr 10 + w@ 4 .r space
 qelemptr 12 + w@
 qelemptr 4 + w@ 1 = IF 
 qelemptr 14 + w@ 65536 * + 
 8 .r space
 qelemptr 4- c@ $80 AND 
 IF ascii y emit ELSE ascii n emit THEN space
 qelemptr 3- c@ 2 .r 2 spaces 
 qelemptr 1- c@ $80 AND 
 IF ascii n emit ELSE ascii y emit THEN cr
 1 +> n 

: dsp.evt { | qelemPtr n -- }
 qinfo “ Queued Events” 
 call SetWTitle
 .” ------------------------------------------------------------------------------------------------” 
 .”  drv# qtype What  Message   When     Where  Mods” cr
 .” ------------------------------------------------------------------------------------------------” 
 evtqhdr 2+ -> qelemptr
 1 -> n
 qelemptr @ ?dup while
 -> qelemptr
 n 3 .r 3 spaces 
 qelemptr 4 + w@ 5 .r space
 qelemptr 6 + w@ 5 .r space
 qelemptr 8 +  @ 8 .r space
 qelemptr 12 + @ 8 .r space
 qelemptr 16 + @ 8 .r space
 qelemptr 20 + w@ 4 .r cr
 1 +> n 

: dsp.fs 
 qinfo “ File System Requests” 
 call SetWTitle

: dsp.dt
 qinfo “ Deferred Tasks”
 call SetWTitle
: { | qelemPtr n -- }
 qinfo “ Time manager”
 call SetWTitle
 .” ----------------------------------------------------” cr
 .” task# qtype  ProcPtr Count” cr
 .” ----------------------------------------------------” cr
 timeVars @ 10 + -> qelemptr
 1 -> n
 qelemptr @ ?dup while
 -> qelemptr
 n 3 .r 3 spaces 
 qelemptr 4 + w@ 5 .r space
 qelemptr 6 +  @ 8 .r space
 qelemptr 10 + w@ 5 .r cr
 1 +> n 

: do.user
 qInfo dup call showwindow call selectwindow
 qInfo taskwindowpointer !
 ( menuID ) CASE
 150 OF dsp.vbl ENDOF
 151 OF  dsp.vcb ENDOF
 152 OF dsp.drv ENDOF
 153 OF  dsp.evt ENDOF
 154 OF dsp.fs  ENDOF
 155 OF  dsp.dt  ENDOF
 156 OF  ENDOF
 SysQueue taskwindowpointer !

: do.update  {  | pt  --  }
 sysQueue call setport

: do.activate
 event-record modifiers + w@ 
 1 AND  \ Activate event?
 call DrawMenuBar

: do.close

 queueBar ADD
 queueBar APPLEMENU ADD   
 queueBar FileMenu  ADD
 queueBar EditMenu  ADD 
 queueBar vblmenu add
 queueBar vcbmenu add
 queueBar drvmenu add
 queueBar evtmenu add
 queueBar fsmenu add
 queueBar dtmenu add
 queueBar tmmenu add

: DO-APPLE   { item# | [ 32 lallot ] daName -- }
 item# 1 =  
 IF3 beep

 ELSE AppleMenu @
 item# ^ DAName CALL GetItem
 ^ DAName CALL OpenDeskAcc DROP

: do-file
 drop bye

: MBAR-HANDLER  ( item# menuID -  )

: go.queue { | mb -- }

 [‘] do.content content-hook !
 [‘] do.update update-hook ! 
 [‘] mbar-handler menu-vector !
 [‘] do.activate activate-hook !
 [‘] do.close goaway-hook !
 [‘] do.user uservector !

 sysQueue call setport
 60 wait

: start
 SysQueue add
 QInfo add
 SysQueue queues build
 SysQueue WRefCon + @
 QInfo WRefCon + !
 SysQueue dup call selectwindow call setport
 queueBar queues mbar>task
 queues go.queue


Community Search:
MacTech Search:

Software Updates via MacUpdate

Cloud 4.1.1 - File sharing from your men...
Cloud is simple file sharing for the Mac. Drag a file from your Mac to the CloudApp icon in the menubar and we take care of the rest. A link to the file will automatically be copied to your clipboard... Read more
OmniFocus 2.7.1 - GTD task manager with...
OmniFocus helps you manage your tasks the way that you want, freeing you to focus your attention on the things that matter to you most. Capturing tasks and ideas is always a keyboard shortcut away in... Read more
CleanApp 5.1.1 - Application deinstaller...
CleanApp is an application deinstaller and archiver.... Your hard drive gets fuller day by day, but do you know why? CleanApp 5 provides you with insights how to reclaim disk space. There are... Read more
ForkLift 3.0 Beta 2 - Powerful file mana...
ForkLift is a powerful file manager and ferociously fast FTP client clothed in a clean and versatile UI that offers the combination of absolute simplicity and raw power expected from a well-executed... Read more
Sublime Text 3126 - Sophisticated text e...
Sublime Text is a sophisticated text editor for code, markup, and prose. You'll love the slick user interface, extraordinary features, and amazing performance. Features Goto Anything. Use Goto... Read more
1Password 6.3.3 - Powerful password mana...
1Password is a password manager that uniquely brings you both security and convenience. It is the only program that provides anti-phishing protection and goes beyond password management by adding Web... Read more
WhatsApp 0.2.1880 - Desktop client for W...
WhatsApp is the desktop client for WhatsApp Messenger, a cross-platform mobile messaging app which allows you to exchange messages without having to pay for SMS. WhatsApp Messenger is available for... Read more
NeoFinder 6.9.3 - Catalog your external...
NeoFinder (formerly CDFinder) rapidly organizes your data, either on external or internal disks, or any other volumes. It catalogs all your data, so you stay in control of your data archive or disk... Read more
Amadeus Pro 2.3.1 - Multitrack sound rec...
Amadeus Pro lets you use your Mac computer for any audio-related task, such as live audio recording, digitizing tapes and records, converting between a variety of sound formats, etc. Thanks to its... Read more
Yasu 4.0.0 β - System maintenance app; p...
Yasu was created with System Administrators who service large groups of workstations in mind, Yasu (Yet Another System Utility) was made to do a specific group of maintenance tasks quickly within a... Read more

Our 5 Favorite iMessage Sticker Packs
At long last, iMessage joins the ranks of messaging apps the likes of LINE and Whatsapp, adding an impressive collection of stickers. They’re a great way to add a little something extra to your daily conversations. [Read more] | Read more »
How to get past Vulture Island's tr...
Vulture Island is a colorful and quirky mish-mash of platforming and puzzles. It’s creative and fresh, but sometimes the game can throw a curveball at you, leaving you stuck as to how you should progress. These tips will help you explore smoothly... | Read more »
The new Clash of Kings is just for Weste...
If you’ve played the original Clash of Kings, you’ll probably recognise the city building, alliance forging and strategic battles in Clash of Kings: The West. What sets this version apart is that it’s tailor made for a Western audience and the... | Read more »
Frost - Survival card game (Games)
Frost - Survival card game 1.12.1 Device: iOS Universal Category: Games Price: $3.99, Version: 1.12.1 (iTunes) Description: *Warning: the game will work on iPhone 5C and above and iPad Pro / 4. Other devices are not supported* | Read more »
How to build and care for your team in D...
Before you hit the trail and become a dog sledding legend, there’s actually a fair bit of prep work to be done. In Dog Sled Saga, you’re not only racing, you’re also building and caring for a team of furry friends. There’s a lot to consider—... | Read more »
How to win every race in Dog Sled Saga
If I had to guess, I’d say Dog Sled Saga is the most adorable racing game on the App Store right now. It’s a dog sled racing sim full of adorable, loyal puppies. Just look at those fluffy little tails wagging. Behind that cute, pixelated facade is... | Read more »
Let the war games commence in Gunship Ba...
Buzz Lightyear famously said, “This isn’t flying, this is falling – with style!” In the case of Gunship Battle: Second War, though, this really is flying - with style! The flight simulator app from Joycity puts you in control of 20 faithfully... | Read more »
How to get a high score in Fired Up
Fired Up is Noodlecake Games’ high score chasing, firefighting adventure. You take control of a wayward firefighter who propels himself up the side of a highrise with blasts of water. Sound silly? It is. It’s also pretty difficult. You can’t... | Read more »
NBA 2K17 (Games)
NBA 2K17 1.0 Device: iOS iPhone Category: Games Price: $7.99, Version: 1.0 (iTunes) Description: Following the record-breaking launch of NBA 2K16, the NBA 2K franchise continues to stake its claim as the most authentic sports video... | Read more »
Dog Sled Saga (Games)
Dog Sled Saga 1.0.1 Device: iOS Universal Category: Games Price: $3.99, Version: 1.0.1 (iTunes) Description: A game by Dan + Lisa As a rookie musher, foster a dogsledding team whose skills will grow if they're treated right. Week by... | Read more »

Price Scanner via

Toughbook Celebrates 20 Years of Ruggedized M...
Panasonic System Communications Company of North America, Division of Panasonic Corporation of North America (Panasonic) today celebrates the 20th anniversary of its industry-leading Toughbook mobile... Read more
13-inch 2.5GHz MacBook Pro (Apple refurbished...
Apple has Certified Refurbished 13″ 2.5GHz MacBook Pros available for $829, or $270 off the cost of new models. Apple’s one-year warranty is standard, and shipping is free: - 13″ 2.5GHz MacBook Pros... Read more
Save 30% on Camera Guard’s Secure Protection...
To celebrate the release of macOS Sierra, Miami-based security solutions company, ProtectStar has announced a special 30% discount on Camera Guard Professional for Mac 2016. This innovative security... Read more
DVDFab Special Deal – Get a 1-Year Free Licen...
Beijing, China based specialist in the field of DVD, Blu-ray and video backup solutions, Fengtao Software has launched its Autumn Special Deals 2016, giving a 1-year free license of a randomly picked... Read more
21-inch iMacs on sale for up to $120 off MSRP
B&H Photo has 21″ iMacs on sale for up to $120 off MSRP including free shipping plus NY sales tax only: - 21″ 3.1GHz iMac 4K: $1379 $120 off MSRP - 21″ 2.8GHz iMac: $1199.99 $100 off MSRP - 21″ 1... Read more
13-inch 2.7GHz/256GB Retina MacBook Pro on sa... has the 13″ 2.7GHz/256GB Retina Apple MacBook Pro on sale for $151 off MSRP including free shipping: - 13″ 2.7GHz/256GB Retina MacBook Pro (sku MF840LL/A): $1348 $151 off MSRP Read more
Apple TVs on sale for up to $50 off MSRP
Best Buy has 32GB and 64GB Apple TVs on sale for $40-$50 off MSRP on their online store. Choose free shipping or free local store pickup (if available). Sale prices for online orders only, in-store... Read more
Apple refurbished 13-inch Retina MacBook Pros...
Apple has Certified Refurbished 13″ Retina MacBook Pros available for up to $270 off the cost of new models. An Apple one-year warranty is included with each model, and shipping is free: - 13″ 2.7GHz... Read more
Duplicate Sweeper Free On Mac App Store For O...
To celebrate the launch of Apple’s latest macOS Sierra, Stafford, United Kingdom based Wide Angle Software has announced that its duplicate file finder software, Duplicate Sweeper, is now available... Read more
13-inch Retina MacBook Pros on sale for up to...
B&H Photo has 13″ Retina Apple MacBook Pros on sale for up to $150 off MSRP. Shipping is free, and B&H charges NY tax only: - 13″ 2.7GHz/128GB Retina MacBook Pro: $1174.99 $125 off MSRP - 13... Read more

Jobs Board

Sr. *Apple* Mac Engineer - Net2Source Inc....
…staffing, training and technology. We have following position open with our client. Sr. Apple Mac Engineer6+ Months CTH Start date : 19th Sept Travelling Job If Read more
*Apple* Retail - Multiple Positions-Norfolk,...
Job Description: Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, Read more
Restaurant Manager (Neighborhood Captain) - A...
…in every aspect of daily operation. WHY YOU'LL LIKE IT: You'll be the Big Apple . You'll solve problems. You'll get to show your ability to handle the stress and Read more
Lead *Apple* Solutions Consultant - Apple (...
# Lead Apple Solutions Consultant Job Number: 51829230 Detroit, Michigan, United States Posted: Sep. 19, 2016 Weekly Hours: 40.00 **Job Summary** The Lead ASC is an Read more
US- *Apple* Store Leader Program - Apple (Un...
…Summary Learn and grow as you explore the art of leadership at the Apple Store. You'll master our retail business inside and out through training, hands-on Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.