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

Ableton Live 9.7.5 - Record music using...
Ableton Live lets you create and record music on your Mac. Use digital instruments, pre-recorded sounds, and sampled loops to arrange, produce, and perform your music like never before. Ableton Live... Read more
Maintenance 2.3.5 - System maintenance u...
Maintenance is a system maintenance and cleaning utility. It allows you to run miscellaneous tasks of system maintenance: Check the status of the hard disk Repair permissions Run periodic scripts... Read more
OnyX 3.3.8 - Maintenance and optimizatio...
OnyX is a multifunction utility that you can use to verify the startup disk and the structure of its system files, to run miscellaneous maintenance and cleaning tasks, to configure parameters in the... Read more
Merlin Project 4.3.1 - $289.00
Merlin Project is the leading professional project management software for OS X. If you plan complex projects on your Mac, you won’t get far with a simple list of tasks. Good planning raises... Read more
WhatsApp 0.2.6426 - 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
DiskCatalogMaker 7.2.5 - Catalog your di...
DiskCatalogMaker is a simple disk management tool which catalogs disks. Simple, light-weight, and fast Finder-like intuitive look and feel Super-fast search algorithm Can compress catalog data for... Read more
BBEdit 12.0.1 - Powerful text and HTML e...
BBEdit is the leading professional HTML and text editor for the Mac. Specifically crafted in response to the needs of Web authors and software developers, this award-winning product provides a... Read more
Hazel 4.2.2 - Create rules for organizin...
Hazel is your personal housekeeper, organizing and cleaning folders based on rules you define. Hazel can also manage your trash and uninstall your applications. Organize your files using a familiar... Read more
Hopper Disassembler 4.3.3- - Binary disa...
Hopper Disassembler is a binary disassembler, decompiler, and debugger for 32- and 64-bit executables. It will let you disassemble any binary you want, and provide you all the information about its... Read more
Adobe InCopy CC 2018 13.0.0.123 - Create...
InCopy CC 2018 is available as part of Adobe Creative Cloud for as little as $19.99/month (or $9.99/month if you're a previous InCopy customer). Adobe InCopy CC 2018, ideal for large team projects... Read more

Guns Royale guide - beginner tips and tr...
If you've been itching to find a mobile battle royale game like Player Unknown's Battlegrounds, you're finally in luck. Guns Royale is a new survival shooter that takes all of the things you love about good ol' PUBG and puts it in a tidy mobile... | Read more »
What we know about Animal Crossing on mo...
At last, we'll be receiving some news about the mobile version of Animal Crossing in a special Nintendo Director at11 PM on October 24. There's been little word on the game since it was first announced, having been met with a series of delays.... | Read more »
Darts of Fury guide - how to rise in the...
Darts of Fury is a new, immensely absorbing darts game from indie studio Yakuto. It's darts in its purest form, but collectible darts and other upgrades give this game an addictive edge that's hard to shake. As your progress out of the beginner... | Read more »
ICEY (Games)
ICEY 1.0 Device: iOS Universal Category: Games Price: $2.99, Version: 1.0 (iTunes) Description: ICEY is a 2D side-scrolling action game. As you follow the narrator's omnipresent voice, you will see through ICEY's eyes and learn the... | Read more »
The best new games we played this week -...
We've made it, folks. Another weekend is upon us. It's time to sit back and relax with the best new releases of the week. Puzzles, strategy RPGs, and arcade games abound this week. There's a lot of quality stuff to unpack this week, so let's hop... | Read more »
Wheels of Aurelia (Games)
Wheels of Aurelia 1.0.1 Device: iOS Universal Category: Games Price: $3.99, Version: 1.0.1 (iTunes) Description: | Read more »
Halcyon 6: Starbase Commander guide - ti...
Halcyon 6 is a well-loved indie RPG with stellar tactical combat and some pretty good writing, too. It's now landed on the App Store, so mobile fans, if you're itching for a good intergalactic adventure, here's your game. Being a strategy RPG, the... | Read more »
Game of Thrones: Conquest guide - how to...
Fans of base building games might be excited to know that yet another entry in the genre has materialized - Game of Thrones: Conquest. Yes, you can now join the many kingdoms of the famed book series, or create your own, as you try to conquer... | Read more »
Halcyon 6: Starbase Commander (Games)
Halcyon 6: Starbase Commander 1.4.2.0 Device: iOS Universal Category: Games Price: $6.99, Version: 1.4.2.0 (iTunes) Description: An epic space strategy RPG with base building, deep tactical combat, crew management, alien diplomacy,... | Read more »
Legacy of Discord celebrates its 1 year...
It’s been a thrilling first year for fans of Legacy of Discord, the stunning PvP dungeon-crawling ARPG from YOOZOO Games, and now it’s time to celebrate the game’s first anniversary. The developers are amping up the festivities with some exciting... | Read more »

Price Scanner via MacPrices.net

27″ 3.4GHz iMac on sale for $1699, save $100
Amazon has the 27″ 3.4GHz iMac (MNE92LL/A) on sale today for $1699 including free shipping. Their price is $100 off MSRP, and it’s the lowest price available for this model (except for Apple’s $1529... Read more
Clearance 2016 15″ MacBook Pros available for...
B&H Photo has leftover 2016 15″ MacBook Pros available for up to $700 off original MSRP. Shipping is free, and B&H charges NY & NJ sales tax only: – 15″ 2.7GHz Touch Bar MacBook Pro Space... Read more
Save $100 on 13″ MacBook Airs, prices start a...
Adorama has 2017 13″ MacBook Airs on sale today for $100 off MSRP including free shipping. Adorama charges NY & NJ sales tax only: – 13″ 1.8GHz/128GB MacBook Air (MQD32LL/A): $899, $100 off MSRP... Read more
1.4GHz Mac mini available for $399, $100 off...
TigerDirect has the 1.4GHz Mac mini on sale today for $399 including free shipping. Their price is $100 off MSRP, and it’s the lowest price available for this model. Although currently out of stock,... Read more
21″ 2.3GHz iMac on sale for $999, save $100
MacMall has the 21″ 2.3GHz iMac (MMQA2LL/A) on sale today for $999 including free shipping. Their price is $100 off MSRP, and it’s the lowest price available for this model. Read more
12″ iPad Pros on sale for $50 off MSRP, no ta...
Adorama has 12″ iPad Pros on sale today for $50 off MSRP. Shipping is free, and Adorama charges sales tax in NY & NJ only: – 12″ 64GB iPad Pro: $749, save $50 – 12″ 256GB iPad Pro: $899, save $50... Read more
9″ iPads on sale for $30 off, starting at $29...
MacMall has 9″ iPads on sale for $30 off including free shipping: – 9″ 32GB iPad: $299 – 9″ 128GB iPad: $399 Read more
Apple restocks full line of refurbished 13″ M...
Apple has restocked a full line of Apple Certified Refurbished 2017 13″ MacBook Pros for $200-$300 off MSRP. A standard Apple one-year warranty is included with each MacBook, and shipping is free.... Read more
13″ 3.1GHz/256GB MacBook Pro on sale for $167...
Amazon has the 2017 13″ 3.1GHz/256GB Space Gray MacBook Pro on sale today for $121 off MSRP including free shipping: – 13″ 3.1GHz/256GB Space Gray MacBook Pro (MPXV2LL/A): $1678 $121 off MSRP Keep an... Read more
13″ MacBook Pros on sale for up to $120 off M...
B&H Photo has 2017 13″ MacBook Pros in stock today and on sale for up to $120 off MSRP, each including free shipping plus NY & NJ sales tax only: – 13-inch 2.3GHz/128GB Space Gray MacBook... Read more

Jobs Board

*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
Project Engineer, *Apple* Education Profess...
Project Engineer, Apple Education Professional Services Job Number: 113143353New York City, New York, United StatesPosted: Oct. 17, 2017Weekly Hours: 40.00 Job Read more
Commerce Software Engineer, *Apple* Media P...
Commerce Software Engineer, Apple Media Products Job Number: 113092072New York City, New York, United StatesPosted: Oct. 19, 2017Weekly Hours: 40.00 Job Summary With Read more
Engineering Manager, *Apple* Retail Enginee...
# Engineering Manager, Apple Retail Engineering Job Number: 58139948 Santa Clara Valley, California, United States Posted: 20-Oct-2017 Weekly Hours: 40.00 **Job 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
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.