TweetFollow Us on Twitter

Apr 91 Letters
Volume Number:7
Issue Number:4
Column Tag:Letters

Overseas Letters and Required OOP

By Kirk Chase, Editor

December 1990 comments

Jon Kleiser

Oslo, Norway

Some comments/answers to articles/letters in the December issue.

• On page 76, Modula-2 Mods / Discrete-Event Simulations, Allen Stenger says:

“But the language of choice for simulation work is an old one, SIMULA 67.

...

As far as I know, none of these specialized simulation languages is available on the Macintosh.”

My comment:

A SIMULA compiler for the Macintosh is available from

Lund Software House

P.O. Box 7056

S-220 07 LUND

Sweden

UUCP address: ...MCVAX!ENEA!DNA!BORIS

Telephone: +46-46-108044 Telefax: +46-46-131021

It requires MPW. The price (if any!) is unknown.

One of the creators of Simula, professor Kristen Nygaard at the University of Oslo, has now created a new programming language called BETA. As far as I know, BETA covers most or all of SIMULA, and much more. BETA is also available for the Macintosh, partly thanks to Apple, Cupertino.

An extensive article about BETA appeared in the Salamanca EUC Conference Proceedings (1990). You may get more info about BETA from

Mjølner Informatics ApS

(Attn.: J. Lindskov Knudsen, O. Lehrmann Madsen)

Science Park Aarhus

Gustav Wieds Vej 10

DK-8000 AARHUS C

Denmark

E-mail addresses: mjolner@mjolner.dk

jlknudsen@daimi.dk

olmadsen@daimi.dk

Telephone: +45-86-202000

In the future we may see regular articles about SIMULA or BETA in MacTutor. (Who knows?)

• Page 92, Mousehole Report, From: Derek, Re: BBS Writing ...

My comment:

I had much the same needs as Derek, and I decided to write my own BBS software. Since I am very fond of HyperCard, I used that, and I am quite pleased with the results. My BBS has been in use at a test site for about four months. However, it’s all Norwegian. I may translate it into English one day, but I can’t say when.

Simula-67 For The Mac

Erik Svensson

FOA 22 (National Defense Research Est.)

Stockholm, Sweden

In the December issue of MacTutor, there was an article by Mr. Allen Stenger. In the article, he mentions Simula-67 and professes to no Simula-67 available for MPW. It’s sold (and Made) by Lund Software House AB (full address at the end). The compiler confirms to the SIMULA standard and has no restrictions. The data segment is restricted to 32K, and this places some restrictions on the total size of the program. The data segment is used for:

1: local variables of the run-time system

2: for templates (a description of a block used by the RTS)

3: for strings and floating-point numbers used in the program

This means that a SIMULA program can’t be bigger than between 4000-10000 lines of source.

Also the generated code for a block may not be bigger than 32K, but in practice this is not a problem. Note the above applies to version 4.07. There might well have been changes to newer versions.

I might add that FOA, a long time user of Simula for both event-driven simulations and general programming is converting (or has converted) to Ada, mostly due to industry demands.

The address to Lund Software House is

Lund Software House AB

Box 7056

S-200 07 Lund

Sweden

Smalltalk Benchmarks

Jean-Luc Schmitt

Héry, France

As the OOP stream is going stronger in the Mac world, MacTutor forgets Smalltalk and specially the implementation from DIGITALK. I have tried the benchmarks you ran for Prograph. For the accuracy test, it took 0.733 seconds, and for the sieve test, 16.866 seconds on an SE/30 (without any add-on). As long as the tests are meaningful, the results are good if you consider that Smalltalk/V is not native 680X0 code but uses a virtual machine and byte-code.

The following is the Smalltalk/V code:

“accuracy test” | x s start stop|
start := MTrap TickCount.
x := 0.0. s:= 0.0.
1000 timesRepeat: [ s:= s + (x * x). x := x + 0.00123].
stop := MTrap TickCount. ^(stop - start)/60

“Sieve test”
| flags k count k prime start stop|
start := MTrap TickCount.
10 times Repeat:
[flags := Array new : 8191. count := 0.
1 to:8191 do: [:i|flags at:i put: 1].
1 to:8191 do: [:i|(flags at: i) = 0
 ifFlase: [prime := i + i + 3. k := i + prime.
 [k <= 8190]
 whileTrue:[flags at: k put: 0. k:= k + prime].
count := count + 1]]].
stop := MTrap TickCount. ^(stop - start)/60

Benchmark Challenge or Brain Challenge?

Conrad Weyns

Oslo, Norway

About “Benchmark Challenge. Walt Davis, Steve Bayer” in the September issue.

Looking at their Table1 and Graph1, I ponder upon two questions, both to do with the results of the “Case” examples:

- Does the processing time get close to zero if the control variable “b” were to increase further?? (Hurry and buy Symantec’s Pascal in that “case”)

- Why is the processing time in the Case-examples constant?

Please publish a disassembly of the produced code. It should be most enlightening!

And let me congratulate: A timing of 20 seconds for either 1x1million or 15x1million useless Pascal Case-tests on a MacPlus is about 3 times better than I can manage with assembly .

Here is a list of the Mach2 Forth Case-equivalents. (I won’t divulge what the If-Else-Then equivalent used: too much parameter fetching, pushing and popping). Run on a MacPlus, in Secs & Ticks, with 60 Ticks = 1 sec.

b Forth-Case my-poor-Assembler-Case

1 18-56 9-43

2 23-57 13-19

3 29-26 16-47

4 34-22 20-21

5 39-17 23-53

14 85-26 55-27

15 90-13 59-08

>15 88-15 59-06


Included in both the Forth and the Assembler “Case” is the time used by the MACH2 Forth DO-LOOP construct which was a constant of 3 secs and 44 ticks.

My Assembler is lousy, or my MacPlus is living a life of its own.

Still, I took up the challenge, didn’t I ? With many regards to MacTutor, I would not miss it for the world.

On Location Helps Developers

David Kramer

Montréal, Canada

I recently purchased On Location, and I’ve found an interesting way that programmers can use this indexing utility. I have about 4Mb of sample source code scattered through thousands of files (TML Source Code, Apple DTS code, etc.). I’ve used On Location to fully index these files. Now, when I need an example of how to use any function, I just call up On Location and search for all of these references to this function from my source code collection. In addition, I can view the text in each sample source code file and cut & paste into my own program. It’s fast, and it’s a great way of learning.

Required OOP

Jeffrey Evans

Kirkland, WA

Several times I’ve started to write about this, but have always preferred to spend my time on other things. Seeing yet another discussion of Apple’s supposed intent to require object programming has finally gotten me into the word processor.

Many times in the last year I’ve heard this talk: programmers will eventually be required to use object programming to work on the Mac. People have gone on and on about it.

The whole thing started with an article in Apple Direct in which a certain Apple guru made the announcement that future operating systems would require OOP. He was very explicit, even saying, “there-we can’t be any more clear about it,” or words to that effect, and added that those who don’t learn OOP now will have to learn it later. At the time I discussed this with a friend, and, dumb guys that we may be, neither of us could figure out a way that such a trick could be accomplished without leaving behind ALL existing Macintosh software, something no sane company would consider doing. So I wrote the author of said article and, guess what-he replied that he didn’t really mean it.

What he really meant was that he thinks object programming is neat and that, in the future, those who use it will be more successful, so that everyone else will “have to” use it in order to compete. In a manner of speaking.

Clearly, this is not the same thing as saying that “Apple will require OOP in future operating systems.” In fact, it’s the same sort of thing that could be said by any committed fan of any programming environment. But no correction has ever been issued, and editor and readers everywhere apparently have swallowed this dubious-sounding proposition without a trace of doubt. It ain’t true.

February Correction

A line, at the bottom of page 22 in the February 1991 issue was inadvertently left off. The line reads as follows:

"The cursorEvt event informs the EA that the cursor is inside"

 

Community Search:
MacTech Search:

Software Updates via MacUpdate

CrossOver 14.1.3 - Run Windows apps on y...
CrossOver can get your Windows productivity applications and PC games up and running on your Mac quickly and easily. CrossOver runs the Windows software that you need on Mac at home, in the office,... Read more
Little Snitch 3.5.3 - Alerts you about o...
Little Snitch gives you control over your private outgoing data. Track background activity As soon as your computer connects to the Internet, applications often have permission to send any... Read more
OmniGraffle Pro 6.2.3 - Create diagrams,...
OmniGraffle Pro helps you draw beautiful diagrams, family trees, flow charts, org charts, layouts, and (mathematically speaking) any other directed or non-directed graphs. We've had people use... Read more
OmniFocus 2.2 - GTD task manager with iO...
OmniFocus helps you manage your tasks the way that you want, freeing you to focus your attention on the things that matter to you most. Capturing tasks and ideas is always a keyboard shortcut away in... Read more
Cocktail 8.4 - 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
PDFKey Pro 4.3 - Edit and print password...
PDFKey Pro can unlock PDF documents protected for printing and copying when you've forgotten your password. It can now also protect your PDF files with a password to prevent unauthorized access and/... Read more
Kodi 15.0.beta1 - Powerful media center...
Kodi (was XBMC) is an award-winning free and open-source (GPL) software media player and entertainment hub that can be installed on Linux, OS X, Windows, iOS, and Android, featuring a 10-foot user... Read more
DiskCatalogMaker 6.4.12 - Catalog your d...
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... Read more
Macs Fan Control 1.3.0.0 - Monitor and c...
Macs Fan Control allows you to monitor and control almost any aspect of your computer's fans, with support for controlling fan speed, temperature sensors pane, menu-bar icon, and autostart with... Read more
Lyn 1.5.11 - Lightweight image browser a...
Lyn is a lightweight and fast image browser and viewer designed for photographers, graphic artists and Web designers. Featuring an extremely versatile and aesthetically pleasing interface, it... Read more

Battle of Gods: Ascension (Games)
Battle of Gods: Ascension 1.0 Device: iOS Universal Category: Games Price: $2.99, Version: 1.0 (iTunes) Description: TURN-BASED TACTICAL COMBATFight tactical battles against the forces of Hades! In Battle of Gods: Ascension you play... | Read more »
Shadowmatic's Latest Update Adds a...
Shadowmatic's shadowy shadow-ness is getting a little shadowy-er thanks to a recent update that adds an Arcade Mode. [Read more] | Read more »
Sunrise Calendar and Slack Have Assimila...
Wunderlist is perhaps one of the most populat and beloved productivity apps on the App Store - and now it's gone and incorporated itself into other useful services like Sunrise Calendar and Slack. [Read more] | Read more »
Crossy Road Devs Hipster Whale are Bring...
Hipster Whale, the minds behind the rather popular (and rather great) Crossy Road, have teamed-up with Bandai Namco to create PAC-MAN 256: an absolutely bonkers looking maze runner chaser thing. | Read more »
Meet the New Spotify Music
Spotify Music  has a lot going on. They're introducing 3 new modes to serve all your musical needs, with the "Now" start page  gives you curated playlists based on your particular tastes. As you listen the app will learn more about your tastes and... | Read more »
What the Apple Watch Gets Right, and Wha...
| Read more »
Celebrate PAC-MAN's 35th Birthday W...
BANDAI NAMCO Entertainment America is celebrating PAC-MAN's 35th anniversary by releasing updates for PAC-MAN and PAC-MAN Lite for iOS. [Read more] | Read more »
Strike Wing Episode 2 has Landed on the...
Strike Wing: Raptor Rising is an exciting space combat simulator by Crescent Moon Games, which was recently updated to continue the story with Episode 2. [Read more] | Read more »
Kiqplan Expands its Interactive Coaching...
The makers of Fitbug have been hard at work on their Kiqplan lineup, and have added four new summer themed plans to help you get the most out of your workout. [Read more] | Read more »
Make a Photobook in Minutes with Pictyea...
What happens when you can't stop taking photos and have an urge to create a photobook? Pictyear saves the day. [Read more] | Read more »

Price Scanner via MacPrices.net

What Would the ideal Apple Productivity Platf...
For the past four years I’ve kept a foot in both the Mac and iPad camps respectively. my daily computing hours divided about 50/50 between the two devices with remarkable consistency. However, there’... Read more
PageMeUp 1.2.1 Ten Dollar Page Layout Applica...
Paris, France-based Softobe, an OS X software development company, has announced that their PageMeUp v. 1.2.1, is available on the Mac App Store for $9.99. The license can be installed on up to 5... Read more
Eight New Products For USB Type-C Application...
Fresco Logic, specialists in advanced connectivity technologies and ICs, has introduced two new product families targeting the Type-C connector recently introduced across a number of consumer... Read more
Scripps National Spelling Bee Launches Buzzwo...
Scripps National Spelling Bee fans can monitor the action at the 2015 Spelling Bee with the new Buzzworthy app for iOS, Android and Windows mobile devices. The free Buzzworthy app provides friendly... Read more
13-inch 2.5GHz MacBook Pro on sale for $120 o...
B&H Photo has the 13″ 2.5GHz MacBook Pro on sale for $979 including free shipping plus NY sales tax only. Their price is $120 off MSRP, and it’s the lowest price for this model (except for Apple’... Read more
27-inch 3.3GHz 5K iMac on sale for $1899, $10...
B&H Photo has the new 27″ 3.3GHz 5K iMac on sale for $1899.99 including free shipping plus NY tax only. Their price is $100 off MSRP. Read more
Save up to $50 on iPad Air 2, NY tax only, fr...
B&H Photo has iPad Air 2s on sale for up to $50 off MSRP including free shipping plus NY sales tax only: - 16GB iPad Air 2 WiFi: $469 $30 off - 64GB iPad Air 2 WiFi: $549.99 $50 off - 128GB iPad... Read more
Updated Mac Price Trackers
We’ve updated our Mac Price Trackers with the latest information on prices, bundles, and availability on systems from Apple’s authorized internet/catalog resellers: - 15″ MacBook Pros - 13″ MacBook... Read more
New 13-inch 2.9GHz Retina MacBook Pro on sale...
B&H Photo has the 13″ 2.9GHz/512GB Retina MacBook Pro on sale for $1699.99 including free shipping plus NY tax only. Their price is $100 off MSRP, and it’s the lowest price for this model from... Read more
Apple refurbished 2014 MacBook Airs available...
The Apple Store has Apple Certified Refurbished 2014 MacBook Airs available starting at $679. An Apple one-year warranty is included with each MacBook, and shipping is free: - 11″ 1.4GHz/128GB... Read more

Jobs Board

Senior Software Engineer - *Apple* SIM - Ap...
Changing the world is all in a day039s work at Apple . If you love innovation, here039s your chance to make a career of it. You039ll work hard. But the job comes with Read more
Lead *Apple* Solutions Consultant - Retail...
**Job Summary** Job Summary The Lead ASC is an Apple employee who serves as the Apple business manager and influencer in a hyper-business critical Reseller's store Read more
Architect / Senior Software Engineer, *Apple...
Changing the world is all in a day039s work at Apple . If you love innovation, here039s your chance to make a career of it. You039ll work hard. But the job comes with Read more
*Apple* Pay Support Readiness Project Manage...
Changing the world is all in a day039s work at Apple . If you love innovation, here039s your chance to make a career of it. You039ll work hard. But the job comes with Read more
Hardware Design Validation Engineer - *Apple...
**Job Summary** The Apple Watch team is looking for a Hardware Design Validation Engineer. This person will be part of the Apple Watch hardware team with Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.