TweetFollow Us on Twitter

Nov 90 Letters
Volume Number:6
Issue Number:11
Column Tag:Letters

SteveForth Corrections

By Kirk Chase, Editor, MacTutor

SteveForth Correction

Steve Hawley

Mountain View, CA

Recently I discovered that SteveForth, a FORTH system that I wrote, had been given a brief write-up in MacTutor Magazine by Jörg Langowski [April 1990-ed.]. I am elated that my work has received a certain measure of exposure in your journal, and I am grateful for the positive marks from Mr. Langowski.

I am at the same time distressed because SteveForth is also misrepresented in the very first paragraph. Mr. Langowski write: “There is a new public domain Forth available in NetLand: SteveForth ” I would like to point out that SteveForth is NOT public domain, nor is it shareware. It is currently in Beta release and is not entirely stable. I do not feel it is ready for a general release, which is why the following paragraph appears in the documentation:

“Thanks for volunteering to beta-test SteveForth. I really appreciate it, and as a token of my appreciation, I have made the source code available to you. I must point out that I do not want SteveForth to be given away until it has been thrashed sufficiently by you. I wrote SteveForth in the space of a semester completely by myself along with a full course load. There’s no possible way it could be completely stable. I’d like to know who my beta-testers are so I can provide them with patches and bug fixes as soon as possible. Giving SteveForth to someone else at this stage isn’t fair to who you give it to, and it isn’t fiar to me, so please don’t do it.”

I am dismayed that Mr. Langowski completely ignored this paragraph (although it is apparent he read the documentation), and offered to give SteveForth away himself without contacting me for approval.

SteveForth is currently on the back burner, as I am busy with other projects and no longer have the convenient access to a Macintosh for development. I anticipate that it will be ready for shareware release sometime in 1991.

Steve Hawley

hawley@adobe.com

Tool Window Manager - Pascal

Brendan Murphy

Palatine, IL 60067

Included on the source code disk for this month (#62) is a Pascal version of the Tool Window Manager written by Mr. Fruin [for the December 1989 issue. I have also included the source on that source code disk, #39-ed]. It was written in TML Pascal II and I have used it with Think Pascal. I translated it from C to Pascal a month after the article came out. I thought of sending it in, but then I read the comment Mr. Fruin made about a Pascal version being forth coming and decided it was not needed. There are no comments in the file--one of life little pleasures! It seems to be fairly well debugged, but there are some flaws in the original design of the unit. For example, being able to float a modeless dialog. The dialog manager gets in the way. Also it is not flexible enough (makes to many assumptions about how people want to have there windows float). Future enhancements could include multiple layered groupings of windows and a more sophisticated multiple active window scheme. Even though I’ve used this unit, I recommend that people use Think’s Class Library instead because it has floating windows and you gain all of there other classes! Besides, it is a good idea to get on the object-oriented programming band wagon before it runs you over. I highly suggest that MacTutor take a more aggressive role in supporting TCL like MacApp Developers Association supports MacApp. I don’t see TCL competing with MacApp, but filling a need where MacApp would be over kill by a factor of ten (which is most of the time).

Pearl Lisp Update

Stephen E. Miner

Mountain View, CA

Your reader might want to know that my article, “Objects in Pearl Lisp” which appeared in the August 1990 issue of your magazine, was submitted a while ago. Since that time, Apple has acquired Coral and discontinued the Pearl Lisp product. Coral’s Common Lisp product is now known as Macintosh Allegro Common Lisp, and is available from APDA.

Although the current version of Macintosh Allegro Common Lisp (MACL) still uses “Object Lisp” implementation of object-oriented programming, the future belongs to the Common Lisp Object System (CLOS) standard. (See Common Lisp: The Language, Second Edition, by Guy L. Steele, Jr. for more information on the CLOS standard.) Apple promises to implement CLOS in the next version of MACL. In the meantime, an implementation of Portable CommonLoops (PCL), which is evolving towards the CLOS standard, is available by anonymous FTP from Arisia.xerox.com or by ordering through APDA.

On a personal note, I’m now working as a Macintosh software consultant at the Institute for Research on Learning in Palo Alto.

B-Tree References

Melvyn D. Magree

Plymouth, MN

I would like to add some references and thoughts to Clifford Story’s article, Language Translation, Binary Trees.

First, Niklaus Wirth’s Algorithms + Data Structures = Programs has a good discussion of tree structures and includes the procedures in Pascal. He discusses Optimal Trees (which he uses for a compiler example), Balanced Binary Tree, and B-Trees among others.

I used Wirth’s B-Tree algorithms as the starting point for B-Tree HELPER™, extending it with reading and writing pages of the tree to a file, managing keys and records separately, getting and releasing file space in a random file, and searching for keys less than or greater than a given key.

Second, D. Comer’s “The Ubiquitous B-Tree” gives a history, rationale, and explanation of B-Trees. His article appears in ACM Computing Surveys, Vol. 11, No. 2, June 1979. He also includes an extensive bibliography.

Comer also explains B*-Trees and B+-Trees. B*-Trees were named by Donald Knuth in The Art of Computer Programing, Vol. 3, Searching and Sorting. Knuth proposed that B*-Trees had nodes that were at least 2/3 full rather than 1/2 full. Many people use the name B*-Tree for another B-Tree variation proposed by Knuth. Comer says that Knuth did not name this variation, but Comer chooses to call it B+-Tree. B+-Trees have all keys in the leaves of the tree. The leaves are also linked from left-to-right making B+-Tree ideal for sequential search. The disadvantage is that some keys are duplicated several times, but there are ways to reduce the storage requirement. I did not use B+-Trees in B-Tree HELPER.

If any reader is looking for a good research topic for a paper or article, consider doing an update on “The Ubiquitous B-Tree”.

Mac286

Orange Micro, Inc.

1400 N. Lakeview

Anaheim, CA 92807

(714) 779-2772

You can now have the best of both worlds. Orange Micro’s Mac286 is a 8MHz, Intel 08286 board fro the Mac II. It literally is a second computer in your Macintosh. With the Mac286, you can execute DOS applications in one window, while you run Mac Programs in another. The Mac286 makes your Mac a full AT compatible. And since this is a hardware/software solution, you will get higher performance than just software solutions. There is also Mac86, a XT compatible board for the Mac SE.

New Product Compatibility Checklist

Kirk Chase

MacTutor

With Apple’s introduction of new products, Apple sent a compatibility letter over AppleLink. The new CPUs will be running System 6.0.6. For those who are not on AppleLink, here is a brief synopsis of the compatibility check list found in that letter.

1. Your application should not write directly to hardware (especially ADB or SCSI). It should call the appropriate system software managers.

2. Do not assume the presence of a floating point unit (FPU) on 68020 and 68030 machines. Always check for it explicitly. The July 1990 issue of Apple Direct (FYI on page 4) discusses this and has more information about how to check for the presence of an FPU.

3. Do not assume monitor pixel resolution (particularly for the color monitor). Check explicitly for the monitor resolution. See “Inside Macintosh”, Volume V, chapters ‘Color QuickDraw’ and ‘Graphics Devices’ for more information.

4. Do not assume the dimension of a monitor (i.e. 640x480). Check explicitly for the monitor size. Always follow the Apple guidelines and size windows automatically according to Technical Note #2.

5. System Software 6.0.6 and System Software 7.0 share the same Sound Manager. Every effort has been made to keep applications that properly addressed the old Sound Manager from breaking. You should carefully check your application with System 6.0.6 for compatibility. MacinTalk will NOT work with System 6.0.6 or System 7.0. If your application requires Macintalk, you will need to rewrite the sound portion of your application for the new Sound Manager.

5a. There is Sound Manager incompatibility between HyperCard 1.2.5 and the Sound Manager in System Software 6.0.6. This sound incompatibility will exist with the Sound Manager in all System Software releases beginning with System Software 6.0.6. However, HyperCard 1.2.5 can run under System Software 6.0.6 if the sound is set to 0 in the Sound CDEV before starting HyperCard. This incompatibility is fixed in HyperCard 2.0.

6. Macintosh SE/30 expansion card developers need to check for several things:

• Cards should be clock/speed independent

• Cards should take CPUCLK off of pin A38 and take C16M off of pin C38

• Cables should be at least 8.6 inches long

• Cards need to fit the latest form factor guidelines described in “Designing Cards and Drivers for the Macintosh Family, Second Edition”.

7. Nubus expansion card developers need to check for several things:

• Cards should be within the NuBus power specification for ONE slot

• Those cards which exceed the power specification for ONE slot should come with documentation that alerts customers that the card should be used in a machine with multiple slots.

• Cards need to fit the latest form factor guidelines described in “Designing Cards and Drivers for the Macintosh Family, Second Edition”.

• Do not assume that memory is a contiguous physical range. Logical addresses may not be the same as physical addresses. Master NuBus cards that may make accesses to the Macintosh RAM space need to be aware of this and use the appropriate Virtual Memory Manager calls to determine the physical memory locations. See “Inside Macintosh”, Volume VI for more details.

 
AAPL
$116.47
Apple Inc.
+0.16
MSFT
$47.98
Microsoft Corpora
-0.72
GOOG
$537.50
Google Inc.
+2.67

MacTech Search:
Community Search:

Software Updates via MacUpdate

Cobook 3.0.7 - Intelligent address book....
Cobook Contacts is an intuitive, engaging address book. Solve the problem of contact management with Cobook Contacts and its simple interface and powerful syncing and integration possibilities.... Read more
StatsBar 1.9 - Monitor system processes...
StatsBar gives you a comprehensive and detailed analysis of the following areas of your Mac: CPU usage Memory usage Disk usage Network and bandwidth usage Battery power and health (MacBooks only)... Read more
Cyberduck 4.6 - FTP and SFTP browser. (F...
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
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
Evernote 6.0.1 - Create searchable notes...
Evernote allows you to easily capture information in any environment using whatever device or platform you find most convenient, and makes this information accessible and searchable at anytime, from... Read more
calibre 2.11 - Complete e-library manage...
Calibre is a complete e-book library manager. Organize your collection, convert your books to multiple formats, and sync with all of your devices. Let Calibre be your multi-tasking digital... Read more
Herald 5.0.1 - Notification plugin for M...
Note: Versions 2.1.3 (for OS X 10.7), 3.0.6 (for OS X 10.8), and 4.0.8 (for OS X 10.9) are no longer supported by the developer. Herald is a notification plugin for Mail.app, Apple's Mac OS X email... Read more
Firetask 3.7 - Innovative task managemen...
Firetask uniquely combines the advantages of classical priority-and-due-date-based task management with GTD. Stay focused and on top of your commitments - Firetask's "Today" view shows all relevant... Read more
TechTool Pro 7.0.6 - Hard drive and syst...
TechTool Pro is now 7, and this is the most advanced version of the acclaimed Macintosh troubleshooting utility created in its 20-year history. Micromat has redeveloped TechTool Pro 7 to be fully 64... Read more
PhotoDesk 3.0.1 - Instagram client for p...
PhotoDesk lets you view, like, comment, and download Instagram pictures/videos! (NO Uploads! / Image Posting! Instagram forbids that! AND you *need* an *existing* Instagram account). But you can do... Read more

Latest Forum Discussions

See All

Ubisoft Gives Everyone Two New Ways to E...
Ubisoft Gives Everyone Two New Ways to Earn In-Game Stuff for Far Cry 4 Posted by Jessica Fisher on November 21st, 2014 [ permalink ] | Read more »
Golfinity – Tips, Tricks, Strategies, an...
Dig this: Would you like to know what we thought of being an infinite golfer? Check out our Golfinity review! Golfinity offers unlimited ways to test your skills at golf. Here are a few ways to make sure your score doesn’t get too high and your... | Read more »
Dark Hearts, The Sequel to Haunting Meli...
Dark Hearts, The Sequel to Haunting Melissa, is Available Now Posted by Jessica Fisher on November 21st, 2014 [ permalink ] Universal App - Designed for iPhone and iPad | Read more »
Meowza! Toyze Brings Talking Tom to Life...
Meowza! | Read more »
Square Enix Announces New Tactical RPG f...
Square Enix Announces New Tactical RPG for Mobile, Heavenstrike Rivals. Posted by Jessica Fisher on November 21st, 2014 [ permalink ] With their epic stories and gorgeous graphics, | Read more »
Quest for Revenge (Games)
Quest for Revenge 1.0.0 Device: iOS Universal Category: Games Price: $4.99, Version: 1.0.0 (iTunes) Description: The great Kingdom of the west has fallen. The gods ignore the prayers of the desperate. A dark warlord has extinguished... | Read more »
Threadz is a New Writing Adventure for Y...
Threadz is a New Writing Adventure for You and Your Friends Posted by Jessica Fisher on November 21st, 2014 [ permalink ] In the tradition of round-robin storytelling, | Read more »
SteelSeries Stratus XL Hardware Review
Made by: SteelSeries Price: $59.99 Hardware/iOS Integration Rating: 4 out of 5 stars Usability Rating: 4.5 out of 5 stars Reuse Value Rating: 4.25 out of 5 stars Build Quality Rating: 4.5 out of 5 stars Overall Rating: 4.31 out of 5 stars | Read more »
ACDSee (Photography)
ACDSee 1.0.0 Device: iOS iPhone Category: Photography Price: $1.99, Version: 1.0.0 (iTunes) Description: Capture, perfect, and share your photos with ACDSee. The ACDSee iPhone app combines an innovative camera, a powerful photo... | Read more »
ProTube for YouTube (Entertainment)
ProTube for YouTube 2.0.2 Device: iOS Universal Category: Entertainment Price: $1.99, Version: 2.0.2 (iTunes) Description: ProTube is the ultimate, fully featured YouTube app. With it's highly polished design, ProTube offers ad-free... | Read more »

Price Scanner via MacPrices.net

15″ 2.2GHz Retina MacBook Pro on sale for $17...
 B&H Photo has the 2014 15″ 2.2GHz Retina MacBook Pro on sale today for $1749. Shipping is free, and B&H charges NY sales tax only. B&H will also include free copies of Parallels Desktop... Read more
27-inch 3.5GHz 5K iMac in stock today and on...
 B&H Photo has the new 27″ 3.5GHz 5K iMac in stock today and on sale for $2299 including free shipping plus NY sales tax only. Their price is $200 off MSRP, and it’s the lowest price available... Read more
21-inch 1.4GHz iMac on sale for $979, save $1...
B&H Photo has the new 21″ 1.4GHz iMac on sale for $979.99 including free shipping plus NY sales tax only. Their price is $120 off MSRP. B&H will also include free copies of Parallels Desktop... Read more
13-inch 1.4GHz/256GB MacBook Air on sale for...
B&H Photo has lowered their price on the 13″ 1.4GHz/256GB MacBook Air to $1059.99 including free shipping plus NY sales tax only. Their price is $140 off MSRP, and it’s the lowest price for this... Read more
Save up to $400 with Apple refurbished 2014 1...
The Apple Store has restocked Apple Certified Refurbished 2014 15″ Retina MacBook Pros for up to $400 off the cost of new models. An Apple one-year warranty is included with each model, and shipping... Read more
New 13-inch 1.4GHz MacBook Air on sale for $8...
 Adorama has the 2014 13″ 1.4GHz/128GB MacBook Air on sale for $899.99 including free shipping plus NY & NJ tax only. Their price is $100 off MSRP. B&H Photo has the 13″ 1.4GHz/128GB MacBook... Read more
Apple Expected to Reverse Nine-Month Tablet S...
Apple and Samsung combined accounted for 62 percent of the nearly 36 million branded tablets shipped in 3Q 2014, according to early vendor shipment share estimates from market intelligence firm ABI... Read more
Stratos: 30 Percent of US Smartphone Owners t...
Stratos, Inc., creator of the Bluetooth Connected Card Platform, has announced results from its 2014 Holiday Mobile Payments Survey. The consumer survey found that nearly one out of three (30 percent... Read more
2014 1.4GHz Mac mini on sale for $449, save $...
 B&H Photo has lowered their price on the new 1.4GHz Mac mini to $449.99 including free shipping plus NY tax only. Their price is $50 off MSRP, and it’s the lowest price available for this new... Read more
Check Apple prices on any device with the iTr...
MacPrices is proud to offer readers a free iOS app (iPhones, iPads, & iPod touch) and Android app (Google Play and Amazon App Store) called iTracx, which allows you to glance at today’s lowest... Read more

Jobs Board

*Apple* Solutions Consultant (ASC) - Apple (...
**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 (ASC)- Retail S...
**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
Project Manager, *Apple* Financial Services...
**Job Summary** Apple Financial Services (AFS) offers consumers, businesses and educational institutions ways to finance Apple purchases. We work with national and Read more
*Apple* Store Leader Program - College Gradu...
Job Description: Job Summary As an Apple Store Leader Program agent, you can continue your education as you major in the art of leadership at the Apple Store. You'll 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
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.