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.

 

Community Search:
MacTech Search:

Software Updates via MacUpdate

Live Home 3D Pro 3.6.2 - $49.99
Live Home 3D Pro is powerful yet intuitive home design software that lets you build the house of your dreams right on your Mac, iPhone or iPad. It has every feature of Live Home 3D, plus some... Read more
RapidWeaver 8.2 - Create template-based...
RapidWeaver is a next-generation Web design application to help you easily create professional-looking Web sites in minutes. No knowledge of complex code is required, RapidWeaver will take care of... Read more
Opera 60.0.3255.109 - High-performance W...
Opera is a fast and secure browser trusted by millions of users. With the intuitive interface, Speed Dial and visual bookmarks for organizing favorite sites, news feature with fresh, relevant content... Read more
DEVONthink Pro 3.0beta2 - Knowledge base...
DEVONthink Pro is your essential assistant for today's world, where almost everything is digital. From shopping receipts to important research papers, your life often fills your hard drive in the... Read more
Tunnelblick 3.7.9 - GUI for OpenVPN.
Tunnelblick is a free, open source graphic user interface for OpenVPN on OS X. It provides easy control of OpenVPN client and/or server connections. It comes as a ready-to-use application with all... Read more
Carbon Copy Cloner 5.1.9 - Easy-to-use b...
Carbon Copy Cloner backups are better than ordinary backups. Suppose the unthinkable happens while you're under deadline to finish a project: your Mac is unresponsive and all you hear is an ominous,... Read more
Dropbox 73.4.118 - Cloud backup and sync...
Dropbox is an application that creates a special Finder folder that automatically syncs online and between your computers. It allows you to both backup files and keeps them up-to-date between systems... Read more
Postbox 6.1.18 - Powerful and flexible e...
Postbox is a new email application that helps you organize your work life and get stuff done. It has all the elegance and simplicity of Apple Mail, but with more power and flexibility to manage even... Read more
Wireshark 3.0.2 - Network protocol analy...
Wireshark is one of the world's foremost network protocol analyzers, and is the standard in many parts of the industry. It is the continuation of a project that started in 1998. Hundreds of... Read more
BetterTouchTool 2.856 - Customize multi-...
BetterTouchTool adds many new, fully customizable gestures to the Magic Mouse, Multi-Touch MacBook trackpad, and Magic Trackpad. These gestures are customizable: Magic Mouse: Pinch in / out (zoom... Read more

AFK Arena guide - Everything you need to...
Ok, so if you're like me, you've been playing (and sometimes waiting) your way through AFK Arena, only to learn there's a lot more to it than there appears on the surface. There's guilds, a PvP arena, and all sorts of other systems and game modes... | Read more »
Explore an epic fantasy world in MMORPG...
Webzen have just announced the official launch date for its stunning MMORPG ‘MU Origin 2’ which will arrive for iOS and Android on May 28th. It will be the second spinoff from the classic PC-based MU Online, and it looks to further refine the... | Read more »
Solar Explorer: New Dawn guide - Tips an...
Solar Explorer: New Dawn is a lunar lander game that really ratchets the intensity up to 11. With all of the asteroids flying around as you fly around at seemingly breakneck speeds, it can be easy to feel overwhelmed bythe whole thing. | Read more »
The Dalaran Heist - How Hearthstone...
I am someone who wrote Hearthstone off a while ago. It was hard not to try and stick with it. The game has incredible production values and a core of really great talent working on the game continuously to keep it feeling fresh and fun (full... | Read more »
Steam Link App - Everything You Need to...
Steam Link has finally released for iOS! That’s right, you can play your epic backlog of PC games on the go now. Well… sort of. While the Steam Link app was announced seemingly ages ago, it only got actual approval for release last night. Check out... | Read more »
Pre-register now for endless superhero r...
Talking Tom Hero Dash is set to take the ever-popular Talking Tom and Friends franchise in a brand new direction as it opens pre-registration to players worldwide. Not only does it promise to be a beautifully rendered, fast-paced, action-packed... | Read more »
AFK Arena - Guild Wars guide
Ok, so if you're like me, you've been playing (and sometimes waiting) your way through AFK Arena, only to learn there's a lot more to it than there appears on the surface. There's guilds, a PvP arena, and all sorts of other systems and game modes... | Read more »
Superhero-themed Talking Tom Hero Dash i...
One of the exciting releases that we’re looking forward to is Talking Tom Hero Dash, an upcoming superhero-themed runner created by Outfit7. This new game is an action-packed endless runner that takes you on an epic adventure to assemble the... | Read more »
Kingdom Rush Vengeance Update Guide 2 -...
Kingdom Rush: Vengeance just got updated once again to add more content to the game. This addition, called The Frozen Nightmare, adds three new levels, five new enemies, two new heroes, and some new achievements. | Read more »
Save the world with SCIENCE in the upcom...
Previous versions of space colonization game TerraGenesis encouraged you to explore the galaxy and settle its planets. The eagerly-awaited 5.0 update will try to smash them to bits. Yep, with a new "world killers" setting, you can unleash... | Read more »

Price Scanner via MacPrices.net

12″ 1.2GHz MacBooks on sale for $999, $300 of...
Amazon has current-generation 12″ 1.2GHz Retina MacBooks on sale for $300 off Apple’s MSRP. Shipping is free: 12″ 1.2GHz Space Gray MacBook: $999.99 $300 off MSRP 12″ 1.2GHz Silver MacBook: $999.99 $... Read more
Here’s how to save $200 on Apple’s new 8-Core...
Apple has released details of their Education discount associated with the new 2019 15″ 6-Core and 8-Core MacBook Pros. Take $200 off the price of the new 8-Core model (now $2599) and $150 off the 15... Read more
Price drops! 2018 15″ 2.2GHz 6-Core MacBook P...
Amazon has dropped prices on clearance 2018 15″ 2.2GHz 6-Core Touch Bar MacBook Pros by $300 with models now available for $2099. These are the same models sold by Apple in their retail and online... Read more
Apple drops prices on 2018 13″ 2.3GHz Quad-Co...
Apple has dropped prices on Certified Refurbished 2018 13″ 2.3GHz 4-Core Touch Bar MacBook Pros with prices now starting at $1489. Apple’s one-year warranty is included, shipping is free, and each... Read more
Apple drops prices on 2018 Certified Refurbis...
Apple has dropped prices on clearance 2018 15″ 6-Core Touch Bar MacBook Pro, Certified Refurbished, with models available starting at only $1999. Each model features a new outer case, shipping is... Read more
Price drops! Clearance 2018 13″ Quad Core Mac...
Amazon has dropped prices on 2018 13″ Apple Quad-Core MacBook Pros with models now available for $250 off original MSRP. Shipping is free. Select Amazon as the seller, rather than a third-party, to... Read more
How Much Is ‘Solace’ Of Mind Worth When Buyin...
COMMENTARY: 05.22.19- Smartphone cases give us peace of mind by providing ample protection for such a fragile gadget and the sky’s the limit as far as choices go with a plethora of brands, styles,... Read more
Get a 13″ Touch Bar MacBook Pro for the lowes...
Apple has Certified Refurbished 2017 13″ 3.1GHz Dual-Core i5 Touch Bar MacBook Pros available starting at $1439, ranging up to $390 off original MSRP. Each MacBook features a new outer case, shipping... Read more
Apple adds new 15″ 8-Core MacBook Pro to line...
Apple has added a new 15″ MacBook Pro to its lineup featuring a 9th generation 2.3GHz 8-Core Intel i9 processor, 16GB of RAM, a 512GB SSD, and a Radeon Pro 560X with 4GB of GDDR5 memory for $2799.... Read more
21″ 2.3GHz iMac available for $999 at B&H...
B&H Photo has the 2018 21″ 2.3GHz Apple iMac on sale for $100 off MSRP. This is the same model offering by Apple in their retail and online stores. Shipping is free: – 21″ 2.3GHz iMac (MMQA2LL/A... Read more

Jobs Board

Best Buy *Apple* Computing Master - Best Bu...
**690427BR** **Job Title:** Best Buy Apple Computing Master **Job Category:** Sales **Location Number:** 000860-Charlottesville-Store **Job Description:** **What Read more
*Apple* Mobile Master - Best Buy (United Sta...
**696430BR** **Job Title:** Apple Mobile Master **Job Category:** Store Associates **Location Number:** 001012-Bismarck-Store **Job Description:** **What does a Best Read more
Manager - *Apple* Team - SHI International...
…opportunity available in the Hardware & Advanced Solutions Department as the Manager of the Apple Team The Manager must be familiar with all aspects of Apple Read more
Best Buy *Apple* Computing Master - Best Bu...
**696375BR** **Job Title:** Best Buy Apple Computing Master **Job Category:** Sales **Location Number:** 000203-North Austin-Store **Job Description:** **What does a Read more
Geek Squad *Apple* Master Consultation Agen...
**696286BR** **Job Title:** Geek Squad Apple Master Consultation Agent **Job Category:** Services/Installation/Repair **Location Number:** 000172-Rivergate-Store Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.