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

Things 3.1.3 - Elegant personal task man...
Things is a task management solution that helps to organize your tasks in an elegant and intuitive way. Things combines powerful features with simplicity through the use of tags and its intelligent... Read more
BetterTouchTool 2.292 - 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
Bookends 12.8.3 - Reference management a...
Bookends is a full-featured bibliography/reference and information-management system for students and professionals. Bookends uses the cloud to sync reference libraries on all the Macs you use.... Read more
Mellel 3.5.5 - The word processor for sc...
Mellel is the leading word processor for OS X and has been widely considered the industry standard since its inception. Mellel focuses on writers and scholars for technical writing and multilingual... Read more
Mellel 3.5.5 - The word processor for sc...
Mellel is the leading word processor for OS X and has been widely considered the industry standard since its inception. Mellel focuses on writers and scholars for technical writing and multilingual... Read more
Bookends 12.8.3 - Reference management a...
Bookends is a full-featured bibliography/reference and information-management system for students and professionals. Bookends uses the cloud to sync reference libraries on all the Macs you use.... Read more
Carbon Copy Cloner 4.1.18 - Easy-to-use...
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
Hopper Disassembler 4.2.14- - Binary dis...
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
BetterTouchTool 2.291 - 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
Sound Studio 4.8.11 - Robust audio recor...
Sound Studio lets you easily record and professionally edit audio on your Mac. Easily rip vinyls and digitize cassette tapes, or record lectures and voice memos. Prepare for live shows with live... Read more

You can now apply to be Clash of Clans...
Earlier this month, word got out that the Builder, the trusty handiman who tirelessly built every single building inevery singleClash of Clansbase had called it quits. Sick of seeing his work destroyed endless, the Builder has set out for our world... | Read more »
Meshi Quest beginner's guide - how...
Meshi Quest is Square Enix's newest free-to-play release, and it's a real charmer. You start off as the head of a sushi restaurant, upgrading your food and equipment as you serve visitors heaping helpings of your delicious meals. As you progress,... | Read more »
BUST-A-MOVE JOURNEY (Games)
BUST-A-MOVE JOURNEY 1.0.0 Device: iOS Universal Category: Games Price: $4.99, Version: 1.0.0 (iTunes) Description: BUST-A-MOVE Features:- Shoot bubbles and match 3 or more bubbles of the same color to make them pop!- Complete your... | Read more »
The best card combos in Clash Royale
Clash Royale is all about building a deck of units that synergise well. To help you get off to a flying start, we've put together a list of unit combinations that are incredibly effective. Looking for some choice 2v2 combos? Check out our guide. [... | Read more »
The best 2v2 card combos in Clash Royale
2v2 is making it's grand return toClash Royalequite soon. 2v2 has quickly become one of the game's most popular gameplay modes, though they still have yet to make it a permanent fixture in the game. 2v2 is exciting and adds some new flavor to... | Read more »
The best games we played this week - Aug...
Another busy week has come to a close. We played a lot of excellent games this week and now it's time to look back and reflect on some our favorites. Here are our picks for the week of August 18. [Read more] | Read more »
War Wings beginner's guide - how to...
War Wings is the newest project from well-established game maker Miniclip. It's a World War II aerial dogfighting game with loads of different airplane models to unlock and battle. The game offers plenty of single player and multiplayer action. We... | Read more »
How to win every 2v2 battle in Clash Roy...
2v2 is coming back to Clash Royale in a big way. Although it's only been available for temporary periods of time, 2v2 has seen a hugely positive fan response, with players clamoring for more team-based gameplay. Soon we'll get yet another taste of... | Read more »
Roll to Win with Game of Dice’s new upda...
Joycity’s hit Game of Dice gets a big new update this week, introducing new maps, mechanics, and even costumes. The update sets players loose on an exciting new map, The Cursed Tower, that allows folks to use special Runes mid-match. If you feel... | Read more »
Bottom of the 9th (Games)
Bottom of the 9th 1.0.1 Device: iOS iPhone Category: Games Price: $4.99, Version: 1.0.1 (iTunes) Description: Play the most exciting moment of baseball in this fast-paced dice and card game! | Read more »

Price Scanner via MacPrices.net

Free Instant Translator 2.0 App For iOS Relea...
Mobile application development company, Neoappz has announced the release and immediate availability of Instant Translator 2.0 for iOS devices. Instant Translator is a user-friendly application which... Read more
2017 15-inch MacBook Pros on sale for $200 of...
Amazon has 2017 15″ MacBook Pros on sale for $200 off MSRP. Shipping is free: – 15″ 2.8GHz MacBook Pro Space Gray: $2199.99, $200 off MSRP – 15″ 2.8GHz MacBook Pro Silver: $2296, $103 off MSRP – 15″... Read more
Apple’s 2017 Back to School Promotion: Free B...
Purchase a new Mac using Apple’s Education discount, and take up to $300 off MSRP. All teachers, students, and staff of any educational institution qualify for the discount. Shipping is free. As part... Read more
Clearance 2016 12-inch Retina MacBooks, Apple...
Apple has Certified Refurbished 2016 12″ Retina MacBooks available starting at $1019. Apple will include a standard one-year warranty with each MacBook, and shipping is free. The following... Read more
15-inch 2.2GHz Retina MacBook Pro, Apple refu...
Apple has Certified Refurbished 2015 15″ 2.2GHz Retina MacBook Pros available for $1699. That’s $300 off MSRP, and it’s the lowest price available for a 15″ MacBook Pro. An Apple one-year warranty is... Read more
Apple refurbished Mac minis available startin...
Apple has Certified Refurbished Mac minis available starting at $419. Apple’s one-year warranty is included with each mini, and shipping is free: – 1.4GHz Mac mini: $419 $80 off MSRP – 2.6GHz Mac... Read more
Apple refurbished iPad Pros available startin...
Apple has Certified Refurbished 2016 12″ WiFi iPad Pros available starting at $589. An Apple one-year warranty is included with each model, and shipping is free: – 32GB 12″ iPad Pro WiFi: $589... Read more
Weekend sale: 13-inch MacBook Pros for up to...
Amazon has new 2017 13″ MacBook Pros on sale today for up to $200 off MSRP, each including free shipping: – 13″ 3.1GHz/256GB Space Gray MacBook Pro (MPXV2LL/A): $1599.99 $200 off MSRP – 13″ 3.1GHz/... Read more
Back To School With The Edge Desk All-in-one...
Back to school is just around the corner, and the ergonomically correct Edge Desk all-in-one portable kneeling desk is ideal for students living in dorms and small apartments, Edge Desk features:... Read more
Norton Core Secure Wi-Fi Router Now Available...
First introduced at the 2017 Consumer Electronics Show (CES), Norton Core, a secure, high-performance Wi-Fi router, fundamentally changed the concept of Wi-Fi routers by making security the primary... 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
Development Operations and Site Reliability E...
Development Operations and Site Reliability Engineer, Apple Payment Gateway Job Number: 57572631 Santa Clara Valley, California, United States Posted: Jul. 27, 2017 Read more
Frameworks Engineering Manager, *Apple* Wat...
Frameworks Engineering Manager, Apple Watch Job Number: 41632321 Santa Clara Valley, California, United States Posted: Jun. 15, 2017 Weekly Hours: 40.00 Job Summary Read more
*Apple* Solutions Consultant - Apple Inc. (U...
…about helping others on a team while also delighting customers? As an Apple Solutions Consultant (ASC), you will discover customers needs and help connect them Read more
*Apple* Solutions Consultant - Apple Inc. (U...
Job Summary As an Apple Solutions Consultant, you'll be the link between our future customers and our products. You'll showcase your entrepreneurial spirit as you Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.