TweetFollow Us on Twitter

Midi 2
Volume Number:1
Issue Number:12
Column Tag:Sound Lab

The Midi Connection, Part II

By Kirk Austin, San Anselmo, CA.

As you may recall from last issue all we need to get MIDI up and running on the Macintosh now that we have the necessary hardware are the driver routines for the serial ports. Fear not fellow coders, the coveted routines have arrived.

The normal device driver model for the Macintosh has too much overhead associated with it to make it approriate for use with MIDI which transfers data at a rate of 31.25K bits per second. Usually, real time applications need all the extra time they can get. This is particularly true of sequencer type applications that do MIDI "multi-track recording" while simultaneously maintaining a graphics display of some sort. routines that directly access the 8530 SCC chip have been utilized in order to minimize the time taken up by the serial I/O. I have tried to make things as easy as possible by providing "building block" style routines that follow the guidelines of the Lisa Pascal interface. This is the reason for the LINK and UNLNK instructions which aren't really necessary otherwise. You can basically treat RxMIDI as a Pascal function that accepts no arguments and returns a word of data as a result that is either a valid MIDI byte or else a flag indicating that no MIDI data is available. TxMIDI can be treated as a Pascal procedure that accepts a word of data containing the MIDI byte to be transmitted as an argument. Both of these routines are stack based.

Since these routines include interrupt handlers with pointers placed in low memory the routines cannot be in a relocatable block. One easy way of insuring this is to place them in your first code segment. If your code only consists of one segment you don't have anything to worry about, but if there is more than one segment the memory manager may move things around on you when you don't expect it. If your interrupt handlers are in one of these relocatable segments the pointers to them can be invalidated which would cause the program to crash.

Okay, let's get down to it. First the SCC chip has to be initialized by calling either SCCinitA or SCCinitB (this should be done when your application initializes quickdraw and the various managers). The initialization ends up being quite a bit of code actually, and if not done properly will mess things up but good! The 8530 can only be accessed at a maximum rate of every 2.2 microseconds. I know, this sounds unbelievable for a sophisticated piece of modern hardware, but it's true. This is the reason for all of the MOVE.L (SP),(SP) instructions. They don't accomplish anything, but they take a little more than a couple of microseconds to execute which is just the amount of delay that we need (silly huh?). As I mentioned in the article on the hardware interface the SCC chip can accept three different external clock frequencys to produce the desired baud rate. The appropriate divisor must be selected in the initialize routine. By the way, these routines are written so you can use either the modem port or the printer port, but if you want to use both simultaneously and keep the ports completely independant you will have to duplicate everything for each port. If you are writing an application of that complexity I think you can handle rewriting these routines.

The transmit and receive routines each maintain circular queues of outgoing and incoming data respectively. These queues can be of any length, but I have arbitrarily set them at $100 bytes each. To change the size of the queues just change the values in the equate table. There is no error detection code for a queue overrun condition so you will have to make sure that your application runs fast enough to avoid this. If an overrun condition occurs you will lose data. If you want to dump huge files all at once (if you are writing a patch librarian for example) just make the queue big enough to handle the entire file and you can do it without worrying about overruns.

The TxMIDI routine is the most complicated one, so let's have a look at it. When this routine receives a byte to transmit (in the lower byte of the word left on the stack by the calling routine) it first must check the queue to see if it is empty or not. If the queue is not empty the byte is simply added to the queue. If the queue is empty the routine checks the SCC chip to see if its transmit buffer is empty. If the transmit buffer is not empty the byte is just added to the queue. But, if the transmit buffer is empty the routine must write the byte to the SCC chip to transmit it.

The RxMIDI routine is more straightforward. It checks to see if there is any data in the queue, and if there is it returns it on the stack (the space for the result must be allocated by the calling routine). If there is no data available the routine returns $FFFF as its result.

The interrupt handlers do exactly what you might expect them to. When a byte is received by the SCC chip a receive interrupt is generated which calls the RxIntHand routine. This routine simply takes the byte from the SCC register and places it in the receive queue. The TxIntHand routine is called when the SCC chip's transmit buffer is empty. It takes a byte from the transmit queue if one is available and writes it to the SCC register. If no data is available it clears the interrupt and returns. One thing about the interrupt handlers that was not obvious to me when I was first coding them was the fact that register A5 must be saved at the beginning of the routines and its value loaded from the system variable CurrentA5 in order to insure that it is pointing to the application's globals area.

Only one thing left to do, and that is reset the 8530 before you quit the application or try to print (if you are using the printer port for MIDI too). Just call SCCResetA or SCCResetB and your application will exit gracefully.

; MIDI PORT ROUTINES
; copyright Kirk Austin 1985

; Transmit and Receive queue length equates

TxQSize EQU $100
RxQSize EQU $100

; Serial Chip Addresses, offsets, and system equates

sccRBaseEQU $9FFFF8
sccWBaseEQU $BFFFF9
Lvl2DT  EQU $1B2
aData EQU 6
aCtl    EQU 2
bData EQU 4
bCtl    EQU 0
TBEEQU  2
CurrentA5 EQU  $904

; This is an example of how to use the routines.
; If this were placed in your event loop your application would
; receive  MIDI data and echo it back out.
;
;MIDIThru
;CLR    -(SP)    ; clear space for result
;BSR    RxMIDI ; fetch data
;MOVE   (SP)+,D0
;CMPI   #$FFFF,D0; any bytes available?
;BEQ    NoMIDI ; if not, exit
;MOVE   D0,-(SP) ; if so, transmit them
;BSR    TxMIDI
;BRA    MIDIThru ; check for more
;NoMIDI
;
; -------------------------------------------------------------------------

; This section contains the necessary routines for MIDI
;
; These are the initialization routines which should be called
; when you  initialize quickdraw and the various managers. 
; Call SCCInitA to use the  modem port, and SCCInitB to use 
; the printer port.

SCCInitA
 MOVE   #aCtl,CtlOffset(A5) ; set up globals for Chn A
 MOVE   #aData,DataOffset(A5)
 MOVE.B #%10000000,ChnReset(A5)
 MOVE   #24,RxIntOffset(A5)
 MOVE   #16,TxIntOffset(A5)
 MOVE   #28,SpecRecCond(A5)
 BRA    SCCInit

SCCInitB
 MOVE   #bCtl,CtlOffset(A5) ; set up globals for Chn B
 MOVE   #bData,DataOffset(A5)
 MOVE.B #%01000000,ChnReset(A5)
 MOVE   #8,RxIntOffset(A5)
 MOVE   #0,TxIntOffset(A5)
 MOVE   #12,SpecRecCond(A5)

SCCInit
 MOVE   SR,-(SP) ; Save interrupts
 MOVEM.LD0/A0-A1,-(SP)  ; Save registers
 ORI    #$0300,SR; Disable interrupts
 
 MOVE.L #sccRBase,A1 ; Get base Read address
 ADD    CtlOffset(A5),A1  ; Add offset for control
 MOVE.B (A1),D0  ; Dummy read
 MOVE.L (SP),(SP); Delay
 MOVE.L #sccWBase,A0 ; Get base Write address
 ADD    CtlOffset(A5),A0  ; Add offset for control
 MOVE.B #9,(A0)  ; pointer for SCC reg 9
 MOVE.L (SP),(SP); Delay
 MOVE.B ChnReset(A5),(A0) ; Reset channel
 MOVE.L (SP),(SP); Delay
 MOVE.B #4,(A0)  ; pointer for SCC reg 4
 MOVE.L (SP),(SP); Delay
; This is where you determine the external clock rate

; %01000100 = 500K
; %10000100 = 1 Meg
; %11000100 = 2 Meg

 MOVE.B #%01000100,(A0) ; 16x clock, 1 stop bit
 MOVE.L (SP),(SP); Delay
 MOVE.B #1,(A0)  ; pointer for SCC reg 1
 MOVE.L (SP),(SP); Delay
 MOVE.B #%00000000,(A0) ; No W/Req
 MOVE.L (SP),(SP); Delay
 MOVE.B #3,(A0)  ; pointer for SCC reg 3
 MOVE.L (SP),(SP); Delay
 MOVE.B #%00000000,(A0) ; Turn off Rx
 MOVE.L (SP),(SP); Delay
 MOVE.B #5,(A0)  ; pointer for SCC reg 5
 MOVE.L (SP),(SP); Delay
 MOVE.B #%00000000,(A0) ; Turn off Tx
 MOVE.L (SP),(SP); Delay
 MOVE.B #11,(A0) ; pointer for SCC reg 11
 MOVE.L (SP),(SP); Delay
 MOVE.B #%00101000,(A0) ; Make TRxC clock sourc
 MOVE.L (SP),(SP); Delay
 MOVE.B #14,(A0) ; pointer for SCC reg 14
 MOVE.L (SP),(SP); Delay
 MOVE.B #%00000000,(A0) ; Disable BRGen
 MOVE.L (SP),(SP); Delay
 MOVE.B #3,(A0)  ; pointer for SCC reg 3
 MOVE.L (SP),(SP); Delay
 MOVE.B #%11000001,(A0) ; Enable Rx
 MOVE.L (SP),(SP); Delay
 MOVE.B #5,(A0)  ; pointer for SCC reg 5
 MOVE.L (SP),(SP); Delay
 MOVE.B #%01101010,(A0) ; Enable Tx and drivers
 MOVE.L (SP),(SP); Delay
 MOVE.B #15,(A0) ; pointer for SCC reg 15
 MOVE.L (SP),(SP); Delay
 MOVE.B #%00001000,(A0) ; Enable DCD int for 
 ; mouse
 MOVE.L (SP),(SP); Delay
 MOVE.B #0,(A0)  ; pointer for SCC reg 0
 MOVE.L (SP),(SP); Delay
 MOVE.B #%00010000,(A0) ; Reset EXT/STATUS
 MOVE.L (SP),(SP); Delay
 MOVE.B #0,(A0)  ; pointer for SCC reg 0
 MOVE.L (SP),(SP); Delay
 MOVE.B #%00010000,(A0) ; Reset EXT/STATUS 
 MOVE.L (SP),(SP); Delay
 MOVE.B #1,(A0)  ; pointer for SCC reg 1
 MOVE.L (SP),(SP); Delay
 MOVE.B #%00010011,(A0) ; Enable interrupts
 MOVE.L (SP),(SP); Delay
 MOVE.B #9,(A0)  ; pointer for SCC reg 9
 MOVE.L (SP),(SP); Delay
 MOVE.B #%00001010,(A0) ; Set master int enable
 MOVE.L (SP),(SP); Delay
 
 MOVE.L #Lvl2DT,A0 ; get dispatch table 
 ; pointer
 MOVE   RxIntOffset(A5),D0; get offset to Rx vector
 LEA    RxIntHand,A1 ; set Rx vector
 MOVE.L A1,0(A0,D0)
 MOVE   TxIntOffset(A5),D0; get offset to Tx vector
 LEA    TxIntHand,A1 ; set Tx vector
 MOVE.L A1,0(A0,D0)
 MOVE   SpecRecCond(A5),D0; get offset to 
 ; Special vector
 LEA    Stub,A1
 MOVE.L A1,0(A0,D0)
 
 CLR    RxByteIn(A5) ; init flags & pointers
 CLR    RxByteOut(A5)
 MOVE.B #$FF,RxQEmpty(A5)
 CLR    TxByteIn(A5)
 CLR    TxByteOut(A5)
 MOVE.B #$FF,TxQEmpty(A5)

 MOVEM.L(SP)+,D0/A0-A1  ; Restore registers
 MOVE   (SP)+,SR ; Restore interrupts
 RTS    ; and return

; This is the routine to transmit a MIDI byte of data.  To use this
; place the byte to be transmitted as the lower 8 bits of a word
; routine on the stack, then BSR to TxMIDI.

TxMIDI
 LINK   A6,#0    ; set frame pointer
 MOVE   SR,-(SP) ; Save interrupts
 MOVEM.LD0/A0-A2,-(SP)  ; Save registers
 ORI    #$0300,SR; Disable interrupts

 TST.B  TxQEmpty(A5) ; is TxQueue empty?
 BNE    TxQE; if so branch
 MOVE   TxByteIn(A5),D0 ; if not add byte to queue
 LEA    TxQueue(A5),A2  ; point to queue
 MOVE.B 9(A6),0(A2,D0)  ; place byte in queue
 ADDQ   #1,D0    ; update TxByteIn
 CMP    #TxQSize,D0
 BNE    @1
 MOVE   #0,D0
@1   MOVE D0,TxByteIn(A5)
 BRA    TxExit   ; and exit
 
TxQE  
 MOVE.L #sccRbase,A0 ; get SCC Read Address
 MOVE.L #sccWbase,A1 ; get SCC Write address
 MOVE   CtlOffset(A5),D0  ; get index for Ctl
 BTST.B #TBE,0(A0,D0); transmit buffer empty?
 BNE    FirstByte; if so branch
 MOVE   TxByteIn(A5),D0 ; if not add to queue
 LEA    TxQueue(A5),A2  ; point to queue
 MOVE.B 9(A6),0(A2,D0)  ; place byte in queue
 ADDQ   #1,D0    ; update index
 CMP    #TxQSize,D0
 BNE    @1
 MOVE   #0,D0
@1  MOVED0,TxByteIn(A5)
 MOVE.B #0,TxQEmpty(A5) ; reset queue empty flag
 BRA    TxExit   ; and exit
 
FirstByte
 MOVE   DataOffset(A5),D0 ; get index to data
 MOVE.L (SP),(SP); delay
 MOVE.B 9(A6),0(A1,D0)  ; write data to SCC
 MOVE.L (SP),(SP); Delay
 

TxExit  
 MOVEM.L(SP)+,D0/A0-A2  ; Restore registers
 MOVE   (SP)+,SR ; Restore interrupts
 UNLK   A6; release frame pointer
 MOVE.L (SP)+,A1 ; save return address
 ADD.L  #2,SP    ; move past data word
 MOVE.L A1,-(SP) ; put address back on stack
 RTS    ; and return

; This is the routine to receive a byte of MIDI data.  To use this
; routine treat it like a Pascal function.  Leave space on the
; stack for a word of data before BSR'ing to this routine.  If the
; routine executes is $FFFF there was no MIDI data available.
; If the upper byte is clear then a valid MIDI byte is in the lower 
; 8 bits.

RxMIDI
 LINK   A6,#0    ; set frame pointer
 MOVE   SR,-(SP) ; Save interrupts
 MOVEM.LD0-D1/A0-A2,-(SP) ; Save registers
 ORI    #$0300,SR; disable interrupts

 TST.B  RxQEmpty(A5) ; any data available?
 BEQ    @1; if so, branch
 MOVE   #$FFFF,8(A6) ; if not, return with $FFFF
 BRA    RxExit
@1  MOVERxByteOut(A5),D0  ; get index to byte out
 LEA    RxQueue(A5),A2  ; point to queue
 MOVE.L #0,D1    ; clear data register
 MOVE.B 0(A2,D0),D1; get MIDI data
 MOVE   D1,8(A6) ; place it on stack for return 
 ADDQ   #1,D0    ; update index
 CMP    #RxQSize,D0
 BNE    @2
 MOVE   #0,D0
@2   MOVE D0,RxByteOut(A5)
 MOVE   RxByteIn(A5),D1
 CMP    D0,D1    ; is queue empty?
 BNE    RxExit   ; if not exit
 MOVE.B #$FF,RxQEmpty(A5) ; if empty, set flag

RxExit  
 MOVEM.L(SP)+,D0-D1/A0-A2 ; Restore registers
 MOVE   (SP)+,SR ; restore interrupts
 UNLK   A6
 RTS    ; and return
 
; This is the interrupt routine for receiving a byte of MIDI data. 
; It places the received byte in a circular queue to be
; accessed later by the application.


RxIntHand
 ORI    #$0300,SR; disable interrupts
 MOVEM.LD0-D1/A0-A2/A5,-(SP); save registers
 MOVE.L CurrentA5,A5 ; make sure A5 is correct
 MOVE.L #sccRBase,A0 ; get SCC address
 MOVE.L #sccWBase,A1
 
 MOVE   DataOffset(A5),D0 ; get data offset
 MOVE.B 0(A0,D0),D1; read data from SCC
 MOVE.L (SP),(SP); Delay
 LEA    RxQueue(A5),A2  ; point to queue
 MOVE   RxByteIn(A5),D0 ; get offset to next cell
 MOVE.B D1,0(A2,D0); put byte in queue
 MOVE.B #0,RxQEmpty(A5) ; reset queue empty flag
 ADDQ   #1,D0    ; update index
 CMP    #RxQSize,D0
 BNE    @1
 MOVE   #0,D0
@1   MOVE D0,RxByteIn(A5)
 
 MOVEM.L(SP)+,D0-D1/A0-A2/A5; restore registers
 ANDI   #$F8FF,SR; enable interrupts
 RTS    ; and return
 
; This is the interrupt routine for transmitting a byte of MIDI
; data.  It  checks to see if there is any data to send.  If there is
; it sends it to the SCC.  If there isn't it resets the TBE interrupt 

; in the SCC and exits.


TxIntHand
 ORI    #$0300,SR; disable interrupts
 MOVEM.LD0-D1/A0-A2/A5,-(SP); save registers
 MOVE.L CurrentA5,A5
 MOVE.L #sccRBase,A0 ; get SCC address
 MOVE.L #sccWBase,A1
 
 TST.B  TxQEmpty(A5) ; Is queue empty?
 BEQ    @1; if not branch
 MOVE   CtlOffset(A5),D0  ; get offset for control
 MOVE.B #$28,0(A1,D0); if so, reset TBE 
 ; interrupt
 MOVE.L (SP),(SP); Delay
 BRA    TxIExit  ; and exit
@1  MOVETxByteOut(A5),D0  ; get index to next data 
 ; byte
 LEA    TxQueue(A5),A2  ; point to queue
 MOVE   DataOffset(A5),D1 ; get data offset
 MOVE.B 0(A2,D0),0(A1,D1) ; write data to SCC
 MOVE.L (SP),(SP); Delay
 ADDQ   #1,D0    ; update index
 CMP    #TxQSize,D0
 BNE    @2
 MOVE   #0,D0
@2   MOVE D0,TxByteOut(A5)
 MOVE   TxByteIn(A5),D1
 CMP    D0,D1    ; is TxQueue empty?
 BNE    TxIExit  ; if not exit
 MOVE.B #$FF,TxQEmpty(A5) ; if empty set flag

TxIExit 
 MOVEM.L(SP)+,D0-D1/A0-A2/A5; restore registers
 ANDI   #$F8FF,SR; enable interrupts
 RTS    ; and return
 
; This routine must be called when the application quits or the
; system will crash due to the interrupt handling pointers 
; becoming invalid.

SCCResetA
 MOVE   #aCtl,CtlOffset(A5) ; set up globals for Chn A
 MOVE   #aData,DataOffset(A5)
 MOVE.B #%10000000,ChnReset(A5)
 MOVE   #24,RxIntOffset(A5)
 MOVE   #16,TxIntOffset(A5)
 MOVE   #28,SpecRecCond(A5)
 BRA    SCCReset

SCCResetB
 MOVE   #bCtl,CtlOffset(A5) ; set up globals for Chn B
 MOVE   #bData,DataOffset(A5)
 MOVE.B #%01000000,ChnReset(A5)
 MOVE   #8,RxIntOffset(A5)
 MOVE   #0,TxIntOffset(A5)
 MOVE   #12,SpecRecCond(A5)

SCCReset
 MOVE   SR,-(SP) ; Save interrupts
 MOVE.L A0,-(SP) ; Save register
 ORI    #$0300,SR; Disable interrupts
 
 MOVE.L #sccWBase,A0 ; Get base Write address
 ADD    CtlOffset(A5),A0  ; Add offset for control
 MOVE.B #9,(A0)  ; pointer for SCC reg 9
 MOVE.L (SP),(SP); Delay
 MOVE.B ChnReset(A5),(A0) ; Reset channel
 MOVE.L (SP),(SP); Delay
 MOVE.B #15,(A0) ; pointer for SCC reg 15
 MOVE.L (SP),(SP); Delay
 MOVE.B #%00001000,(A0) ; Enable DCD int
 MOVE.L (SP),(SP); Delay
 MOVE.B #0,(A0)  ; pointer for SCC reg 0
 MOVE.L (SP),(SP); Delay
 MOVE.B #%00010000,(A0) ; Reset EXT/STATUS
 MOVE.L (SP),(SP); Delay
 MOVE.B #0,(A0)  ; pointer for SCC reg 0
 MOVE.L (SP),(SP); Delay
 MOVE.B #%00010000,(A0) ; Reset EXT/STATUS 
 MOVE.L (SP),(SP); Delay
 MOVE.B #1,(A0)  ; pointer for SCC reg 1
 MOVE.L (SP),(SP); Delay
 MOVE.B #%00000001,(A0) ; Enable mouse 
 ; interrupts
 MOVE.L (SP),(SP); Delay
 MOVE.B #9,(A0)  ; pointer for SCC reg 9
 MOVE.L (SP),(SP); Delay
 MOVE.B #%00001010,(A0) ; Set master int enable
 MOVE.L (SP),(SP); Delay
 
 MOVE.L (SP)+,A0 ; Restore register
 MOVE   (SP)+,SR ; Restore interrupts
 RTS    ; and return

; this is the space for a special condition interrupt routine

Stub
 RTS
;-------------------------------MIDI Globals--------------------------------
CtlOffset DS.W 1 ; offset for channel control
DataOffsetDS.W 1 ; offset for channel data
ChnResetDS.B1  ; SCC channel reset select
RxIntOffset DS.W 1 ; offset for dispatch table
TxIntOffset DS.W 1 ; offset for dispatch table
SpecRecCond DS.W 1 ; offset for dispatch table

TxQueue DS.BTxQSize; transmitted data queue
TxQEmptyDS.B1  ; Transmit queue empty flag
TxByteInDS.W1  ; index to next cell in
TxByteOut DS.W 1 ; index to next cell out

RxQueue DS.BRxQSize; received data queue
RxQEmptyDS.B1  ; receive queue empty flag
RxByteInDS.W1  ; index to next cell in 
RxByteOut DS.W 1 ; index to next cell out 

End
 

Community Search:
MacTech Search:

Software Updates via MacUpdate

Yummy FTP Pro 1.11.14 - $14.99 (50% off)
Yummy FTP Pro is an advanced Mac file transfer app which provides a full-featured professional toolkit combined with blazing speeds and impeccable reliability, so whether you want to transfer a few... Read more
ExpanDrive 5.4.4 - Access cloud storage...
ExpanDrive builds cloud storage in every application, acts just like a USB drive plugged into your Mac. With ExpanDrive, you can securely access any remote file server directly from the Finder or... Read more
Dash 3.4.3 - Instant search and offline...
Dash is an API documentation browser and code snippet manager. Dash helps you store snippets of code, as well as instantly search and browse documentation for almost any API you might use (for a full... Read more
Civilization VI 1.0.2 - Next iteration o...
Sid Meier’s Civilization VI is the next entry in the popular Civilization franchise. Originally created by legendary game designer Sid Meier, Civilization is a strategy game in which you attempt to... Read more
TurboTax 2016 - Manage your 2016 U.S. ta...
TurboTax guides you through your tax return step by step, does all the calculations, and checks your return for errors and overlooked deductions. It lets you file your return electronically to get... Read more
Microsoft Office 2016 15.30 - Popular pr...
Microsoft Office 2016 - Unmistakably Office, designed for Mac. The new versions of Word, Excel, PowerPoint, Outlook and OneNote provide the best of both worlds for Mac users - the familiar Office... Read more
FotoMagico 5.3 - Powerful slideshow crea...
FotoMagico lets you create professional slideshows from your photos and music with just a few, simple mouse clicks. It sports a very clean and intuitive yet powerful user interface. High image... Read more
Acorn 5.6.1 - Bitmap image editor.
Acorn is a new image editor built with one goal in mind - simplicity. Fast, easy, and fluid, Acorn provides the options you'll need without any overhead. Acorn feels right, and won't drain your bank... Read more
iMazing 2.1.8 - Complete iOS device mana...
iMazing (was DiskAid) is the ultimate iOS device manager with capabilities far beyond what iTunes offers. With iMazing and your iOS device (iPhone, iPad, or iPod), you can: Copy music to and from... Read more
Logic Pro X 10.3 - Music creation and au...
Logic Pro X is the most advanced version of Logic ever. Sophisticated new tools for professional songwriting, editing, and mixing are built around a modern interface that's designed to get creative... Read more

Red's Kingdom (Games)
Red's Kingdom 1.0 Device: iOS Universal Category: Games Price: $4.99, Version: 1.0 (iTunes) Description: Mad King Mac has kidnapped your father and stolen your golden nut! Solve puzzles and battle goons as you explore and battle your... | Read more »
Turbo League Guide: How to tame the cont...
| Read more »
Fire Emblem: Heroes coming to Google Pla...
Nintendo gave us our first look at Fire Emblem: Heroes, the upcoming mobile Fire Emblem game the company hinted at last year. Revealed at the Fire Emblem Direct event held today, the game will condense the series' tactical RPG combat into bite-... | Read more »
ReSlice (Music)
ReSlice 1.0 Device: iOS Universal Category: Music Price: $9.99, Version: 1.0 (iTunes) Description: Audio Slice Machine Slice your audio samples with ReSlice and create flexible musical atoms which can be triggered by MIDI notes or... | Read more »
Stickman Surfer rides in with the tide t...
Stickson is back and this time he's taken up yet another extreme sport - surfing. Stickman Surfer is out this Thursday on both iOS and Android, so if you've been following the other Stickman adventures, you might be interested in picking this one... | Read more »
Z-Exemplar (Games)
Z-Exemplar 1.4 Device: iOS Universal Category: Games Price: $3.99, Version: 1.4 (iTunes) Description: | Read more »
5 dastardly difficult roguelikes like th...
Edmund McMillen's popular roguelike creation The Binding of Isaac: Rebirth has finally crawled onto mobile devices. It's a grotesque dual-stick shooter that tosses you into an endless, procedurally generated basement as you, the pitiable Isaac,... | Read more »
Last week on PocketGamer
Welcome to a weekly feature looking back on the past seven days of coverage on our sister website, PocketGamer. It’s taken a while for 2017 to really get going, at least when it comes to the world of portable gaming. Thank goodness, then, for... | Read more »
ROME: Total War - Barbarian Invasion set...
To the delight of mobile strategy fans, Feral Interactive released ROME: Total War just a few months ago. Now the game's expansion, Barbarian Invasion is marching onto iPads as a standalone release. [Read more] | Read more »
Yuri (Games)
Yuri 1.0 Device: iOS iPhone Category: Games Price: $3.99, Version: 1.0 (iTunes) Description: It's night. Yuri opens his eyes. He wakes up in a strange forest.The small, courageous explorer rides on his bed on casters in this... | Read more »

Price Scanner via MacPrices.net

13-inch 2.7GHz Retina MacBook Pro on sale for...
B&H Photo has the 2015 13″ 2.7GHz/128GB Retina Apple MacBook Pro on sale for $100 off MSRP. Shipping is free, and B&H charges NY tax only: - 13″ 2.7GHz/128GB Retina MacBook Pro (MF839LL/A): $... Read more
Laptop Market – Flight To Quality? – The ‘Boo...
Preliminary quarterly PC shipments data released by Gartner Inc. last week reveal an interesting disparity between sales performance of major name PC vendors as opposed to that of less well-known... Read more
IBM and Bell Transform Canadian Enterprise Mo...
IBM and Bell Canada have announced they are joining forces to offer IBM MobileFirst for iOS market-ready enterprise applications for iPad, iPhone or Apple Watch. Bell, Canada’s largest communications... Read more
Otter Products is Closing… For a Day of Givin...
On Thursday, Feb. 9, Otter Products is closing doors to open hearts. In partnership with the OtterCares Foundation, the company is pausing operations for a day so all employees can volunteer with... Read more
15-inch 2.2GHz Retina MacBook Pro on sale for...
Amazon has 2015 15″ 2.2GHz Retina MacBook Pros (MJLQ2LL/A) available for $1799.99 including free shipping. Apple charges $1999 for this model, so Amazon’s price is represents a $200 savings. Read more
Back in stock: Apple refurbished 13-inch Reti...
Apple has Certified Refurbished 2015 13″ Retina MacBook Pros available for up to $360 off original MSRP, starting at $1099. An Apple one-year warranty is included with each model, and shipping is... Read more
CalcTape for macOS 1.2 Adding Machine App for...
schoettler Software has announced CalcTape 1.2, an update to their desktop calculator for macOS. When it comes to adding long columns of numbers, doing complex calculations or playing around with... Read more
New MacBooks And MacBook Pros WIth Kaby Lake...
Digitimes’ Joseph Tsai cites a Chinese-language Economic Daily News (EDN) report that unnamed market watchers are predicting Apple MacBook shipments to grow 10 percent in 2017, and projecting 15... Read more
New 2016 13-inch MacBook Pros on sale for up...
B&H Photo has the new 2016 13″ MacBook Pros in stock today and on sale for up to $150 off MSRP. Shipping is free, and B&H charges NY sales tax only: - 13″ 2.9GHz/512GB Touch Bar MacBook Pro... Read more
New 15-inch Touch Bar MacBook Pros in stock a...
B&H Photo has the new 2016 15″ Apple Touch Bar MacBook Pros in stock today and on sale for up to $150 off MSRP. Shipping is free, and B&H charges NY sales tax only: - 15″ 2.7GHz Touch Bar... Read more

Jobs Board

*Apple* & PC Desktop Support Technician...
Apple & PC Desktop Support Technician job in Los Angeles, CA Introduction: We have immediate job openings for several Desktop Support Technicians with one of our Read more
*Apple* Retail - Multiple Positions - Apple,...
SalesSpecialist - Retail Customer Service and SalesTransform Apple Store visitors into loyal Apple customers. When customers enter the store, you're also the Read more
*Apple* Retail - Multiple Positions (Multi-L...
Job Description: Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, Read more
*Apple* Retail - Multiple Positions - Apple,...
Job Description: Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, Read more
*Apple* & PC Desktop Support Technician...
Apple & PC Desktop Support Technician job in Stamford, CT We have immediate job openings for several Desktop Support Technicians with one of our most well-known Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.