TweetFollow Us on Twitter

Aug 92 Letters
Volume Number:8
Issue Number:4
Column Tag:Letters

Letters

By Neil Ticktin, Editor

Higher quality, larger Magazine for less money

May I first say that I love your magazine (I love anything about the Mac!). I’m a professional programmer for Xerox Corporation, but I do Mac programming for fun. I have some criticisms that I think could improve your magazine.

1) Remove the beginner section - there are a bunch of books out there that treat this subject - the reason that I came to your magazine is because it “pushed the envelope” and had complex, advanced algorithms in it.

2) Change the glossy paper to recycled paper, triple the size of the magazine, and then charge $5.00!

3) How about an article about the “ins” and “outs” of writing Printer Drivers?... or ...”Why It Takes Three Man-Years to Write a Mac Printer Driver” ???

...remember, I think your program should out teach basic programming skills, but should assume the audience is made up of average-to-advanced programmers... the personal attitude which should lead people to your magazine is motivation, not a general “how does one start programming the Mac?”

- Andy Ritz, El Segundo, CA

[Andy, in regards to the “beginner” section, most of our readers tell us that even though they thought they knew a topic, they found something new and interesting in Dave Mark’s articles. I understand that books are out there, in fact I urge people to buy them. I also understand that this column will not only help the new programmers, but also those who want to clean up their style.

Regarding the changing of the stock, increasing the size, and charging less. Please call me with the name of the printer that you know can do this. As far as we know, this isn’t possible without a drastic increase in price.

Finally, I would encourage someone to write an article on printer drivers. Right now, we don’t have such an article scheduled, but if you know of someone, let me know. MacTutor’s editorial goal is to provide information to all levels of programmer, from beginners to advanced. We’ll continue to make all efforts to reach this goal. - Ed.]

Less Is Better!

Thank you for the new-look MacTutor. Like many other subscribers, I was beginning to wonder what had happened to MacTutor - having assumed that my subscription had lapsed. Never mind! The replacement of the old with the new is often a good thing.

I was particularly pleased with your policy decision not to print vast amounts of code. In the future, articles which focus on particular coding tricks or secrets or useful but not well-known techniques would be most welcome. Such articles should be succinct and to the point and present only the code snippets necessary to explain the idea.

Many of the past MacTutor articles have hidden gems of knowledge inside very specialized solutions or inside programming frameworks which are not used by the everyday reader. For example I am using the THINK Class Library these days and any other “framework” is of no direct relevance to me. However, particular techniques of, say, using the toolbox, are. If these could be presented in a more generic way so that they could be easily adapted to different frameworks and programming environments, then this would be very useful. Wishing you every success with the new MacTutor.

- Paul Howson, Queensland, Australia

[Part of the purpose of Dave Mark’s article is to address how to properly access parts of the toolbox. Even if you are not a novice programmer, skim his articles and compare it with your own style. We’ll try to continue doing things in a general fashion. - Ed.]

MacApp and A/UX

I agree with you about the Tools. I need some. I understand what you're saying about POSITIVE and NEGATIVE requests. I hear and understand.

I would like some beginner's code on using MacApp. I know, you've beaten this one to a pulp. But version 3 is out, and I wasn't listening before.

I would like some coverage on programming stuff to specific A/UX and MacOS integration problems.

What a thrill to get mail from someone I just saw on a magazine editor's spot. This InterNET keeps on giving me chills (I had many conversations with Frank Da Cruz & Yoshi...WOW).

- Steven Woolgar, CHUS-FAMUS

[Steven, we’ll work to get some good quality starter articles on MacApp as well as advanced ones. As far as A/UX. I’ve heard this request a couple times. Who else is interested? More specifically, what would you like to see? - Ed.]

Glad to see you back

First of all I'm glad MacTutor is back in business! I like the renewed lay-out, the editor's intentions seem OK. I’m just wondering when you will release version 2.0.1 or the Tune-Up.

• Don't forget us Pascal programmers out here, we're still alive and kicking!

• I always enjoyed the MouseHole Report. It adresses real problems. Why not start a "Talk show" on AppleLink?

• I agree on the reduction of printed code, there's indeed no need to print yet another "DoNothing" shell.

• You could pay more attention to the international side of programming. There are still programmers abound who think that the world is flat and lies between Boston and L.A.

• If possible I'd like to receive my subscription copy before the issue appears in the local window display.

Oh and yes I will renew my subscription Can this be done through AppleLink?

So keep it going, we really need you. I learned and still learn more from MacTutor than from any other source available.

- Luc Roels, Diegem, Belgium

[Luc, as far as the talk show, AppleLink is very expensive to do this and doesn’t make sense for us. We are looking into other solutions so stay tuned. I hear you on the localization topic. I’ll look for articles.

As far as delivery. It will almost always show up in the stores a bit before your mailbox. The reason is that shippers are faster than the postal service in any country. The only way to avoid this would be to delay shipment to the dealers. But, we’ll continue to look for faster delivery methods.

Can you subscribe via AppleLink? Yes, see the front of the magazine for info on communication with us. - Ed.]

Correctly Efficient

I just got the second issue of the new MacTutor. I haven’t quite finished reading it all yet, but from my initial skim through it it looks like every article has something of interest to me-which is great!

I’ve just finished Mike Scanlin’s article on “Efficient 68000 Programming”. It’s got lots of useful tips that I will endeavour to keep in mind. However, one of his code samples annoys me, because it repeats a mistake that a lot of Mac assembly-language hackers seem to make.

On page 40 he gives the following replacement for a _BlockMove call:

Subq #1,Dx
@1 Move.B (A0)+,(A1)+
Dbra Dx,@1

Now, it’s a well-known feature of the DBcc group of instructions on the 68000 processor family that they terminate the loop when the count reaches -1, rather than zero. What’s not so well-known is that this is no accidental quirk, but a carefully-thought-out design feature. It allows you to automatically handle the case where the loop count is initially zero, without having to put in a separate test before entering the loop.

Here is an example of the right way to use a DBRA to move a block of bytes:

 move.w count, d0
 bra.s  @9
@1 move.b (a0)+, (a1)+
@9 dbra d0, @1

Notice how the loop is entered by branching to its end? That causes an extra initial execution of the DBRA instruction. This subtracts 1 from the loop count (adjusting for the termination on -1 instead of zero), and it will fall through without actually entering the loop if the count was initially zero. Elegant, huh?

It is also possible to use DBRA with a 32-bit loop count. Here is an example skeleton loop:

 move.l count, d0
 bra.s  @9
@1 swap d0
@2
; .. body of loop ..
@9 dbra d0, @2
 swap d0
 dbra d0, @1

Basically this is a DBRA loop within a DBRA loop: the outer loop counts down the high word of the 32-bit count, while the inner one handles the low word. Since the SWAPs and the outer DBRA are only executed once every 64K iterations of the inner loop, you’re still effectively getting the full speed of a simple DBRA loop.

There-now I’ve got that off my chest, I must finish the rest of the magazine.

- Lawrence D’Oliveiro, New Zealand

More Pascal!

For your information, the journal is quite interesting. I believe it could be a bit more technical, and would also like to see more Pascal programs. (I know, few times Pascal and “Technical” appear in the same sentence; however, I believe that Symantec’s Pascal has become powerful enough to write full fledge applications.) Overall, the magazine is quite useful, as well as helpful. Try to keep it oriented towards programmers.

- Edward Wolpert, Knoxville, TX

[Edward, great suggestion. I too would like to see more Pascal articles. They are getting harder and harder to find because of the incredible success of C and C++. I will keep vigilant in my search for more Pascal articles! - Ed.]

 
AAPL
$102.50
Apple Inc.
+0.25
MSFT
$45.43
Microsoft Corpora
+0.55
GOOG
$571.60
Google Inc.
+2.40

MacTech Search:
Community Search:

Software Updates via MacUpdate

Skype 6.19.0.450 - Voice-over-internet p...
Skype allows you to talk to friends, family and co-workers across the Internet without the inconvenience of long distance telephone charges. Using peer-to-peer data transmission technology, Skype... Read more
VueScan 9.4.41 - Scanner software with a...
VueScan is a scanning program that works with most high-quality flatbed and film scanners to produce scans that have excellent color fidelity and color balance. VueScan is easy to use, and has... Read more
Cloud 3.0.0 - 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
LibreOffice 4.3.1.2 - Free Open Source o...
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
SlingPlayer Plugin 3.3.20.505 - Browser...
SlingPlayer is the screen interface software that works hand-in-hand with the hardware inside the Slingbox to make your TV viewing experience just like that at home. It features an array of... Read more
Get Lyrical 3.8 - Auto-magically adds ly...
Get Lyrical auto-magically add lyrics to songs in iTunes. You can choose either a selection of tracks, or the current track. Or turn on "Active Tagging" to get lyrics for songs as you play them.... Read more
Viber 4.2.2 - Send messages and make cal...
Viber lets you send free messages and make free calls to other Viber users, on any device and network, in any country! Viber syncs your contacts, messages and call history with your mobile device,... Read more
Cocktail 7.6 - General maintenance and o...
Cocktail is a general purpose utility for OS X that lets you clean, repair and optimize your Mac. It is a powerful digital toolset that helps hundreds of thousands of Mac users around the world get... Read more
LaunchBar 6.1 - Powerful file/URL/email...
LaunchBar is an award-winning productivity utility that offers an amazingly intuitive and efficient way to search and access any kind of information stored on your computer or on the Web. It provides... Read more
Maya 2015 - Professional 3D modeling and...
Maya is an award-winning software and powerful, integrated 3D modeling, animation, visual effects, and rendering solution. Because Maya is based on an open architecture, all your work can be scripted... Read more

Latest Forum Discussions

See All

Rhonna Designs Magic (Photography)
Rhonna Designs Magic 1.0 Device: iOS Universal Category: Photography Price: $1.99, Version: 1.0 (iTunes) Description: Want to sprinkle *magic* on your photos? With RD Magic, you can add colors, filters, light leaks, bokeh, edges,... | Read more »
This Week at 148Apps: August 25-29, 2014
Shiny Happy App Reviews   | Read more »
Qube Kingdom – Tips, Tricks, Strategies,...
Qube Kingdom is a tower defense game from DeNA. You rally your troops – magicians, archers, knights, barbarians, and others – and fight against an evil menace looking to dominate your kingdom of tiny squares. Planning a war isn’t easy, so here are a... | Read more »
Qube Kingdom Review
Qube Kingdom Review By Nadia Oxford on August 29th, 2014 Our Rating: :: KIND OF A SQUARE KINGDOMUniversal App - Designed for iPhone and iPad Qube Kingdom has cute visuals, but it’s a pretty basic tower defense game at heart.   | Read more »
Fire in the Hole Review
Fire in the Hole Review By Rob Thomas on August 29th, 2014 Our Rating: :: WALK THE PLANKUniversal App - Designed for iPhone and iPad Seafoam’s Fire in the Hole looks like a bright, 8-bit throwback, but there’s not enough booty to... | Read more »
Alien Creeps TD is Now Available Worldwi...
Alien Creeps TD is Now Available Worldwide Posted by Ellis Spice on August 29th, 2014 [ permalink ] Universal App - Designed for iPhone and iPad | Read more »
Dodo Master Review
Dodo Master Review By Jordan Minor on August 29th, 2014 Our Rating: :: NEST EGGiPad Only App - Designed for the iPad Dodo Master is tough but fair, and that’s what makes it a joy to play.   | Read more »
Motorsport Manager Review
Motorsport Manager Review By Lee Hamlet on August 29th, 2014 Our Rating: :: MARVELOUS MANAGEMENTUniversal App - Designed for iPhone and iPad Despite its depth and sense of tactical freedom, Motorsport Manager is one of the most... | Read more »
Motorsport Manager – Beginner Tips, Tric...
The world of Motorsport management can be an unforgiving and merciless one, so to help with some of the stress that comes with running a successful race team, here are a few hints and tips to leave your opponents in the dust. | Read more »
CalPal Update Brings the App to 2.0, Add...
CalPal Update Brings the App to 2.0, Adds Lots of New Stuff Posted by Ellis Spice on August 29th, 2014 [ permalink ] | Read more »

Price Scanner via MacPrices.net

Apple now offering refurbished 21-inch 1.4GHz...
The Apple Store is now offering Apple Certified Refurbished 21″ 1.4GHz iMacs for $929 including free shipping plus Apple’s standard one-year warranty. Their price is $170 off the cost of new models,... Read more
Save $50 on the 2.5GHz Mac mini, on sale for...
B&H Photo has the 2.5GHz Mac mini on sale for $549.99 including free shipping. That’s $50 off MSRP, and B&H will also include a free copy of Parallels Desktop software. NY sales tax only. Read more
Save up to $300 on an iMac with Apple refurbi...
The Apple Store has Apple Certified Refurbished iMacs available for up to $300 off the cost of new models. Apple’s one-year warranty is standard, and shipping is free. These are the best prices on... Read more
The Rise of Phablets
Carlisle & Gallagher Consulting Group, a businesses and technology consulting firm focused solely on the financial services industry, has released an infographic depicting the convergence of... Read more
Bad Driver Database App Allows Good Drivers t...
Bad Driver Database 1.4 by Facile Group is a new iOS and Android app that lets users instantly input and see how many times a careless, reckless or just plain stupid driver has been added to the... Read more
Eddy – Cloud Music Player for iPhone/iPad Fre...
Ukraine based CapableBits announces the release of Eddy, its tiny, but smart and powerful cloud music player for iPhone and iPad that allows users to stream or download music directly from cloud... Read more
A&D Medical Launches Its WellnessConnecte...
For consumers and the healthcare providers and loved ones who care for them, A&D Medical, a leader in connected health and biometric measurement devices and services, has launched its... Read more
Anand Lal Shimpi Retires From AnandTech
Anand Lal Shimpi, whose AnandTech Website is famous for its meticulously detailed and thoroughgoing reviews and analysis, is packing it in. Lal Shimpi, who founded the tech site at age 14 in 1997,... Read more
2.5GHz Mac mini, Apple refurbished, in stock...
The Apple Store has Apple Certified Refurbished 2.5GHz Mac minis available for $509, $90 off MSRP. Apple’s one-year warranty is included, and shipping is free. Read more
13-inch 2.5GHz MacBook Pro on sale for $999,...
B&H Photo has the 13″ 2.5GHz MacBook Pro on sale for $999.99 including free shipping plus NY sales tax only. Their price is $100 off MSRP. Read more

Jobs Board

*Apple* Retail - Multiple Positions (US) - A...
Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, you're also the Read more
*Apple* Retail - Multiple Positions (US) - A...
Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, you're also the Read more
*Apple* Retail - Multiple Positions (US) - A...
Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, you're also the Read more
*Apple* Retail - Multiple Positions (US) - A...
Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, you're also the Read more
Senior Event Manager, *Apple* Retail Market...
…This senior level position is responsible for leading and imagining the Apple Retail Team's global event strategy. Delivering an overarching brand story; in-store, Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.