TweetFollow Us on Twitter

Jul 85 Letters
Volume Number:1
Issue Number:8
Column Tag:Letters

Letters

Startup Disk

David Dunham

Maitreya Design

Goleta, CA.

I'd be willing to submit a DA that changes the default drive, but you should know that the default drive has absolutely nothing to do with the start-up disk [MacTutor, June 1985, p. 24]. To change the start-up disk, you'd need to close the open system file and open a new one. This could present problems, since the application may have handles to purged resources from the system file. I don't know what happens if the file's closed from under it. What are your writer's guidelines and how much do you pay? Nothing for tips in letters, I know from experience...

[Typical pay is $100 for a column. Another $50 if you become a regular contributing editor. We hope that some things (like letter tips) people will donate for the good of the cause; we only have so much $$ to go around...-Ed.]

MicroFinder Bug Fix

Shawn Mikiten

San Antonio, Tx.

MicroFinder [June MacTutor 1-7] works well as long as you do not select a file on the other disk drive. The bug appears in the way the _Launch trap runs the application. The filename is properly passed but not the volumne the file is on. The _Launch trap will automatically attempt to run the application on the disk the MicroFinder was started from because the filename did not have the volumne specifier before it. The solution lies in the _Pack3 reply record. The variable vRefNum contains the disk drive number of the file when it returns from a successful call. Using the vRefNum value obtained, it is put in a parameter block for the File Manager call _SetVol. The parameter used is ioDrvNum. The following are directions for patching the source code so that it will work (See File Manager /OS/FS.A.1, page 26 & 33 in the new "Inside Macintosh" phone book.)

Add _SetVol trap value:

.TRAP      _SetVol               $A015

The code following _PaintRect is to be added:

_PaintRect

;   Launch Routine here

LEA          PARMBLK, A0         ;get pointer
LEA           vRefNum, A1           ; get addr. of vRefNum
MOVE.W   (A1), 22(A0)           ; put vRefNum into the
                                                               ; ioDrvNum 
parameter.
_SetVol                                            ; set it. (note A0 
points to
                                                             ; the param. 
block!)

LEA        SFileName, A1          ; get addr. of filename

Next, add the data structures necessary for the Reply record and parameter block. Add vRefNum in the Reply record:

SFREPLY:         DC.B      0,0       ; good, copy 
                 DC.B      'TYPE'    ; FType     (ostype)
 vRefNum:        DC.W       0,0      ;  vRefNum, version 
SFILENAME:       DCB.B    63,0       ; fname (string[63]) 

And now the parameter block, to be added after the WHITEPAT definition (Note that the file name pointer must be nil to force invocation of vRefNum inserted into ioDrvNum.):

;  standard 8 field parameter block for setvol.

PARMBLK:           DC.L       0            ;ioLink ptr.
                                    DC.W      0           ; ioType
                                    DC.W      0           ; ioTrap
                                    DC.W      0          ; ioCmdAddr
                                    DC.L         0          ; ioCompletion 
ptr.
                                    DC.W        0          ; ioResult
                                    DC.L          0          ; ioFileName 
ptr.
                                    DC.W        0          ; ioDrvNum

I hope this bug fix will offset the cost of the MDS software I am about to purchase. I havebeen using a friends copy and find it the easiest assembler I have used in 7 years of Apple II's, Digital 2065, IBM PC and VAX computers!

[Shawn wins the $50 for being first with his bug fix. Thank you to the four other people who submitted a fix: Loftus Becker Jr. of Hartford, CT, who submitted a similar solution to Shawn's; Tom Taylor of Provo Utah and Neal Lebedin of Palm Bay, FL., both of whom submitted similar solutions but slightly different from Shawn's; And Paul Snively of Columbus, IN. in MacAsm...-Ed.]

More Bug Fix Comments

Loftus E. Becker, Jr.

Hartford, CT.

The bug in Chris Yerga's microfinder program (ID=26) is "failure to launch". This stems from the fact that the lanuch routine will look for the named file on the default volume unless it is told otherwise. Hence, when the microfinder program is run from the default volume (usually drive 1) and tries to launch a program on drive 2, Launch gets the filename, doesn't know it's on drive 2, and tries to launch from drive 1!

Two points may be of some interest. First this is a bomb that is not trapped by Macsbug. Second, a similar bug appears in the MDS development system: If you are developing a program with the .asm, .link, and other files on the external drive, but the program itsef on the internal drive, an attempt to run it from the TRANSFER menu in the linker will produce the same error.My compliments on a magzine that has gotten better with every issue.

Alternate Bug Fix

Tom Taylor

Provo, UT

This is similar in function , but uses the stack for the parameter block...

ioVQElSize           EQU   $40     ;io param blk length
ioCompletion       EQU   $C       ;offset (ptr.)
ioVNPtr                   EQU   $12     ;offset (ptr. or nil)
ioVRefNum          EQU   $16     ;offset (word)

SUB.L    #ioVQElSize, SP    ;allocate block on stack
MOVE.L  SP, A0                        ;block ptr. to A0
CLR.L     ioCompletion(A0)  ; I always clear this
LEA         SFReply, A1             ; reply record ptr to A0
MOVE.W 6(A1), ioVRefNum(A0)  
CLR.L      ioVNPtr(A0)             ;clear name ptr.

_SetVol                                           ; go for it...
ADD.L      #ioVQElSize, SP  ; dump block

MacAsm Version of Bug Fix

Paul Snively

Columbus, IN

Apparently the standard file package, even though it automatically senses the presence of a second disk drive and, if one is present, gives you the "Drive" button in the standard dialog box, does not automatically change the default volume if the "Drive" button is hit. Where I come from, features like this are called "bugs." In other words, as far as I'm concerned, the bug is in the standard file package, not Chris' code

.

01150 *--------------------------------
01160 *        Launch Routine (MacAsm)
01170 *--------------------------------
01180          LEA     ParamBlock(PC),A0       ;File Manager paramBlock
01190          LEA     vRefNum(PC),A1          ;Volume Reference Number
01200          MOVE.W  (A1),22(A0)             ;Move to paramBlock
01210          OST     SetVol                  ;Make the default volume
01220          LEA     SFileName(PC),A1        ;Get address of file name
01230          LEA     LaunchPtr(PC),A0        ;Get address of launch 
ptr
01240          MOVE.L  A1,(A0)                 ;Move pointer to name
01250          TBX     Launch                  ;And call Launch...

Don't Like Glossy Look

Warren Michelsen

Page, Az.

I may as well comment on your new glossy look. In a word, YUCK! The gloss degrades the readability. The older stock could be viewed at any angle without glare. The older stock holds up better too; (they receive very heavy use as I refer back to them constantly). [We agree; how do you like this look? -Ed.]

Need Pascal Detective on this Bug!

Jack Cassidy

San Diego, CA.

Put a MacPascal detective on this one! The program below causes a system error (ID=02). Needless to say, I discovered this bug in a much longer program and was very confused.

program SystemBomb;
type
   count = (one, two, three, four, five);
var
   simple:array[count] of integer;

begin
    simple[five]:=31;
end.

[We'll ask our resident guru, Steve Brecher to research out this one!]

Mental Starvation of MacWorld

Rick Barrett

Dallas, TX.

AH! EUREKA,

This is the publication that I've been looking for. It's not glossy [well...-Ed.], slick, or condescending. It's meat, fact, it's wonderful! Keep up the good work...I've been rescued from the mental starvation of MacWorld.

Desperately Seeking Chief Wizard

James Muirhead

I was dissappointed to see Chris Derossi's Pascal Procedures column missing from the last issue. I was all psyched for learning window dynamics and then there was a no-show. His column is a must. Please let him know that he is sorely needed and most appreciated.

[Chris has stopped writing for reasons known only to him; perhaps your plea will awaken him...-Ed.]

MacTutor leaves me Codeless

R. Onzo

FW. Inc.

I have just recieved your complimentary issue of MacTutor and I must admit that it was an immediate sale. Your "Journal" is certainly unique compared to anything I've ever seen and the anticipation of finally being able to associate myself with a first rate tech journal leaves me almost "codeless". You've honestly made me feel like I've been trapped inside my Mac. You seemd to have just peeked inside, found me there tangled in the chips and guided me to the nearest exit showing me in the interum, the vast highways leading outward (and subsequently, inward). [Wow! we did all that? Thanks for those kind words...-Ed.]

Changing Basic Poke Codes

Terry Bartelmey

Chicago, Il.

My print routines are set up with pokes to change PRINT to LPRINT and back. I have inquired with Microsoft as to the poke locations required for the Mac, but to no avail. Could you help? [YES! See Mike Steiner's column on the structure of a Basic Program. It has all the info you need to change PRINT to LPRINT under program control.-Ed.]

Imagewrite Cutesy, but...

David Haupt

Littleton, CO.

It is cutesy to have the magazine printed out on an imagewriter but unprofessional in appearance. It is not as easy to read as a typset style woulld be. One would think that any magazine would be able to at least afford 7 grand for the Apple laser printer, wouldn't one? That would drastically increase the readability and the perceived professional level of MacTutor simultaneously.

[MacTutor is run by individuals, who, like any of us, are poor! Seven grand is seven grand, no matter if you publish a magazine or not! However, we have sacrificed the baby's milk money and now have the laser, after a three month delivery delay from Apple! How do you like it now?-Ed.]

Untested Code?

Inexcuseable is the only word for publishing untested code. Just plain sloth. Yet that is exactly what Robert Denny confesses to print [in the May issue]. I like his column on C, but I am startled at his lack of professional pride.

[ I think your letter was a little hard on us; Bob's code was taken from a much longer program that is running, but the code fragments were not re-assembled into a program just to test them specifically, hence the warning. -Ed.]

 

Community Search:
MacTech Search:

Software Updates via MacUpdate

Logic Pro X 10.1.1 - Music creation and...
Apple 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... Read more
VLC Media Player 2.2.0 - Popular multime...
VLC Media Player is a highly portable multimedia player for various audio and video formats (MPEG-1, MPEG-2, MPEG-4, DivX, MP3, OGG, ...) as well as DVDs, VCDs, and various streaming protocols. It... Read more
Sound Studio 4.7.8 - Robust audio record...
Sound Studio lets you easily record and professionally edit audio on your Mac. Easily rip vinyls and digitize cassette tapes, or record lectures and voice memos. Prepare for live shows with live... Read more
LibreOffice 4.4.1.2 - Free, open-source...
LibreOffice is an office suite (word processor, spreadsheet, presentations, drawing tool) compatible with other major office suites. The Document Foundation is coordinating development and... Read more
Freeway Pro 7.0.3 - Drag-and-drop Web de...
Freeway Pro lets you build websites with speed and precision... without writing a line of code! With its user-oriented drag-and-drop interface, Freeway Pro helps you piece together the website of... Read more
Cloud 3.3.0 - 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
Cyberduck 4.6.5 - FTP and SFTP browser....
Cyberduck is a robust FTP/FTP-TLS/SFTP browser for the Mac whose lack of visual clutter and cleverly intuitive features make it easy to use. Support for external editors and system technologies such... Read more
Firefox 36.0 - Fast, safe Web browser. (...
Firefox for Mac offers a fast, safe Web browsing experience. Browse quickly, securely, and effortlessly. With its industry-leading features, Firefox is the choice of Web development professionals and... Read more
Thunderbird 31.5.0 - Email client from M...
As of July 2012, Thunderbird has transitioned to a new governance model, with new features being developed by the broader free software and open source community, and security fixes and improvements... Read more
VOX 2.4 - Music player that supports man...
VoxIt just sounds better! The beauty is in its simplicity, yet behind the minimal exterior lies a powerful music player with a ton of features & support for all audio formats you should ever need... Read more

Get The Whole Story – Lone Wolf Complete...
Get The Whole Story – Lone Wolf Complete is Now Available and On Sale Posted by Jessica Fisher on February 27th, 2015 [ permalink ] Universal App - Designed for iPhone and iPad | Read more »
Who Wore it Best? The Counting Dead vs....
Like it or not, the “clicker” genre, popularized by cute distractions like Candy Box and Cookie Clicker, seems like it’s here to stay. So Who Wore it Best? takes a look at two recent examples: The Counting Dead and AdVenture Capitalist. | Read more »
Card Crawl, the Mini Deck Building Game,...
Card Crawl, the Mini Deck Building Game, is Coming Soon Posted by Jessica Fisher on February 27th, 2015 [ permalink ] Tinytouchtales and Mexer have announced their new game, | Read more »
Witness an all new puzzle mechanic in Bl...
Well, BlastBall MAX is not one of those games and is bucking trends such as timers, elements of randomness, and tacked-on mechanics in favor of pure puzzle gameplay. When you first boot up the game you’ll see a grid made up of squares that are each... | Read more »
This Princess Has a Dragon and She isn’t...
This Princess Has a Dragon and She isn’t Afraid to Useit. | Read more »
Mecha Showdown Review
Mecha Showdown Review By Lee Hamlet on February 27th, 2015 Our Rating: :: IN A SPINUniversal App - Designed for iPhone and iPad Mecha Showdown replaces traditional buttons with a slot machine mechanic in this robot fighting game,... | Read more »
Reliance Games and Dreamworks Unveil Rea...
Reliance Games and Dreamworks Unveil Real Steel Champions Posted by Ellis Spice on February 27th, 2015 [ permalink ] Reliance Games and Dreamworks have announced that a third game in | Read more »
Sum Idea Review
Sum Idea Review By Jennifer Allen on February 27th, 2015 Our Rating: :: TAXING NUMBERSUniversal App - Designed for iPhone and iPad Sum Idea is a fairly charming but taxing puzzle game.   | Read more »
A New Badland Update Brings Daydream Lev...
A New Badland Update Brings Daydream Levels to Co-Op Posted by Ellis Spice on February 27th, 2015 [ permalink ] Universal App - Designed for iPhone and iPad | Read more »
Slashing Demons Review
Slashing Demons Review By Lee Hamlet on February 27th, 2015 Our Rating: :: IT'S A LONG WAY TO THE TOPUniversal App - Designed for iPhone and iPad Slashing Demons lacks the depth or scope to take it beyond the point of being just... | Read more »

Price Scanner via MacPrices.net

Apple CEO Tim Cook to Deliver 2015 George Was...
Apple CEO Tim Cook will deliver the George Washington University’s Commencement address to GWU grads on May 17, at which time he will also be awarded an honorary doctorate of public service from the... Read more
Apple restocks refurbished Mac minis for up t...
The Apple Store has restocked Apple Certified Refurbished 2014 Mac minis, with models available starting at $419. Apple’s one-year warranty is included with each mini, and shipping is free: - 1.4GHz... Read more
Save up to $50 on iPad Air 2s, NY tax only, f...
 B&H Photo has iPad Air 2s on sale for $50 off MSRP including free shipping plus NY sales tax only: - 16GB iPad Air 2 WiFi: $469.99 $30 off - 64GB iPad Air 2 WiFi: $549 $50 off - 128GB iPad Air 2... Read more
16GB iPad Air 2 on sale for $447, save $52
Walmart has the 16GB iPad Air 2 WiFi on sale for $446.99 on their online store for a limited time. Choose free shipping or free local store pickup (if available). Sale price for online orders only,... Read more
iMacs on sale for up to $205 off MSRP
B&H Photo has 21″ and 27″ iMacs on sale for up to $205 off MSRP including free shipping plus NY sales tax only: - 21″ 1.4GHz iMac: $1029 $70 off - 21″ 2.7GHz iMac: $1199 $100 off - 21″ 2.9GHz... Read more
Apple Takes 89 Percent Share of Global Smartp...
According to the latest research from Strategy Analytics, global smartphone operating profit reached US$21 billion in Q4 2014. The Android operating system captured a record-low 11 percent global... Read more
New Travel Health App “My Travel Health” iOS...
Rochester, Minnesota based Travel Health and Wellness LLC has announced that its new iOS app help safeguard the user’s health when traveling abroad — “My Travel Health” is now available on the Apple... Read more
Sale! MacBook Airs for up to $115 off MSRP
B&H Photo has MacBook Airs on sale for up to $100 off MSRP. Shipping is free, and B&H charges NY sales tax only: - 11″ 128GB MacBook Air: $799 100 off MSRP - 11″ 256GB MacBook Air: $999 $100... Read more
15-inch 2.0GHz Retina MacBook Pro (refurbishe...
The Apple Store has Apple Certified Refurbished previous-generation 15″ 2.0GHz Retina MacBook Pros available for $1489 including free shipping plus Apple’s standard one-year warranty. Their price is... Read more
Wither The iPad mini? End Of The Road Imminen...
AppleDailyReport’s Dennis Sellers predicts that the iPad mini is going to be left to wither on the vine, as it were, and then just allowed to fade away — a casualty of the IPhone 6 Plus and other... Read more

Jobs Board

Sr. Technical Services Consultant, *Apple*...
**Job Summary** Apple Professional Services (APS) has an opening for a senior technical position that contributes to Apple 's efforts for strategic and transactional Read more
Event Director, *Apple* Retail Marketing -...
…This senior level position is responsible for leading and imagining the Apple Retail Team's global engagement strategy and team. Delivering an overarching brand Read more
*Apple* Pay - Site Reliability Engineer - Ap...
**Job Summary** Imagine what you could do here. At Apple , great ideas have a way of becoming great products, services, and customer experiences very quickly. Bring Read more
*Apple* Solutions Consultant - Retail Sales...
**Job Summary** The ASC is an Apple employee who serves as an Apple brand ambassador and influencer in a Reseller's store. The ASC's role is to grow Apple Read more
*Apple* Solutions Consultant - Retail Sales...
**Job Summary** As an Apple Solutions Consultant (ASC) you are the link between our customers and our products. Your role is to drive the Apple business in a retail Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.