TweetFollow Us on Twitter

Aug 97 MacTech Online

Volume Number: 13 (1997)
Issue Number: 8
Column Tag: MacTech Online

MacTech Online

by Nicholas C. "nick.c" DeMello <online@mactech.com>

It's Called MacsBug

Not MacBug, not MacBugs. The acronym stands for "Motorola advanced computer systems debugger." This powerful system extension allows developers to view and manipulate the contents of the Macintosh ram. You can download the latest version from Apple's Developer World ftp site, but if that (or any Apple ftp server) is busy check out Apple's "Software Home" page. The Software Home allows you to search for the latest version of any software Apple distributes.

MacsBug can be installed by simply dragging its file into your system folder (not your control panels folder, not your system extensions folder). When you restart your "Welcome to Macintosh" screen will display "debugger installed" if MacsBug loads (or the phrase "...carry a big stick" if you have a beta OS). Once installed, you can drop into MacsBug by hitting the command and power (triangle) keys together. Older systems require a system extension called programmers key to drop into MacsBug. Dropping into MacsBug suspends all processes and allows you direct access to all values in memory (great for pausing Doom). To return to the finder hit command-G, or to restart your Mac type "rs."

One way to learn more about using MacsBug is to drop into it and type "help" (or if you'd rather get the same information without wandering around your system memory visit Thomas Kimpton's MacsBug Help page). The Code Mechanic, Dave Evans, has at least three develop articles about wielding MacsBug (my favorite was "Stalking the Wild Defect"). In the September 1994 MacTech tips and tidbits there is a nice example of how to build a MacsBug macro, and the neat trick of making it execute automatically, every time MacsBug is entered. Check it out on the MacTech website.

Sleuthing through your systems memory is only half the fun though. When you've built up enough confidence to try and manipulate some memory see the Kool MacsBug Tricks page.

Download MacsBug from Devworld
ftp://ftp.apple.com/devworld/Tool_Chest/Testing_-_Debugging/Debuggers_-_dcmds/
Find the Latest Apple Software at Apple's "Software Home"
http://support.info.apple.com/ftp/swhome.html
Download Programmers Key or EvenBetterBusError
ftp://ftp.apple.com/devworld/Tool_Chest/Testing_-_Debugging/General_tools/
MacsBug Help
http://www.ambrosiasw.com/~dnebing/macsbug.html
Stalking the Wild Defect
http://devworld.apple.com/dev/techsupport/develop/issue27/balance.html
The MacsBug "Every time" Macro, MacTech Archives
www.mactech.com/articles/mactech/Vol.10/10.09/Sep94Tips/index.html
Kool MacsBug Tricks
http://gossamer.wheatonma.edu/users/bcote/syzgycult/Macsbug.html

EvenBetterBusError -- The Art of the Controlled Crash

EvenBetterBusError crashes your Mac. Unlike most software though, Greg Marriott's system extension does so on purpose. When you have EBBE installed, if your code dereferences a NIL pointer, writes to a NIL pointer, or attempts to execute code at NIL EBBE will crash your Mac (dropping you into MacsBug). Greg has put EBBE and three other stress testing tools that he developed at Apple on the web. Greg warns that some these tools are showing a little age, and recommends folks consider Onyx technologies commercial stress testing tools. Onyx's QC is an established and well respected stress tester. If you want to shake your code -- hard: give it to QC.

Oh, and those of you looking for the fourth generation of Mr. BusError can find YetEvenBetterBusError (aka DavesBetterBusError) beta on Dave Evan's web site. This more aggressive version of EBBE, announced in the May 1997 MacTech, can also be found on the MacTech ftp site along with the Tidy Heap C++ class library (for tracking proper use of new and delete).

EvenBetterBusError & Other Kool Tools by Greg Marriott
http://www.spies.com/~greg/tools.html
About QC...
http://www.onyx-tech.com/faq/current_QC_faq.html
Dave Evans & DavesBetterBusError
http://ng.netgate.net/~tilde/mechanic/
YEBBE & Tidy Heap
ftp://ftp.mactech.com//mactech/src/13.05/

Parting Shots

Next month MacTech Online is going to get serious about Java -- really. One last debugging tool you should check out before then is the Zone Ranger. Zone Ranger is a valuable tool for the counts and total sizes of the free blocks, pointers, handles, locked handles, purgeable handles, and resource handles that can be found on the Metrowerks web site. See you next month.

-- nick.c <online@mactech.com>

Joshua Golub's Zone Ranger
http://www.metrowerks.com/tools/software/zoneranger.html
 
AAPL
$104.83
Apple Inc.
+1.84
MSFT
$45.02
Microsoft Corpora
+0.64
GOOG
$543.98
Google Inc.
+11.27

MacTech Search:
Community Search:

Software Updates via MacUpdate

Delicious Library 3.3.2 - Import, browse...
Delicious Library allows you to import, browse, and share all your books, movies, music, and video games with Delicious Library. Run your very own library from your home or office using our... Read more
Art Text 2.4.8 - Create high quality hea...
Art Text is an OS X application for creating high quality textual graphics, headings, logos, icons, Web site elements, and buttons. Thanks to multi-layer support, creating complex graphics is no... Read more
Live Interior 3D Pro 2.9.6 - Powerful an...
Live Interior 3D Pro is a powerful yet very intuitive interior designing application. View Video Tutorials It has every feature of Live Interior 3D Standard, plus some exclusive ones: Create multi... Read more
The Hit List 1.1.7 - Advanced reminder a...
The Hit List manages the daily chaos of your modern life. It's easy to learn - it's as easy as making lists. And it's powerful enough to let you plan, then forget, then act when the time is right.... Read more
jAlbum Pro 12.2.4 - Organize your digita...
jAlbum Pro has all the features you love in jAlbum, but comes with a commercial license. With jAlbum, you can create gorgeous custom photo galleries for the Web without writing a line of code!... Read more
jAlbum 12.2.4 - Create custom photo gall...
With jAlbum, you can create gorgeous custom photo galleries for the Web without writing a line of code! Beginner-friendly, with pro results Simply drag and drop photos into groups, choose a design... Read more
ExpanDrive 4.1.7 - Access remote files o...
ExpanDrive builds cloud storage in every application, acts just like a USB drive plugged into your Mac. With ExpanDrive, you can securely access any remote file server directly from the Finder or... Read more
OmniOutliner Pro 4.1.3 - Pro version of...
OmniOutliner Pro is a flexible program for creating, collecting, and organizing information. Give your creativity a kick start by using an application that's actually designed to help you think. It'... Read more
Evernote 5.6.2 - 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
OmniOutliner 4.1.3 - Organize your ideas...
OmniOutliner is a flexible program for creating, collecting, and organizing information. Give your creativity a kick start by using an application that's actually designed to help you think. It's... Read more

Latest Forum Discussions

See All

Toca Boo (Education)
Toca Boo 1.0.2 Device: iOS Universal Category: Education Price: $2.99, Version: 1.0.2 (iTunes) Description: BOO! Did I scare you!? My name is Bonnie and my family loves to spook! Do you want to scare them back? Follow me and I'll... | Read more »
Intuon (Games)
Intuon 1.1 Device: iOS Universal Category: Games Price: $.99, Version: 1.1 (iTunes) Description: Join the battle with your intuition in a new hardcore game Intuon! How well do you trust your intuition? Can you find a needle in a... | Read more »
Ravenous Rampage (Games)
Ravenous Rampage 1.0 Device: iOS Universal Category: Games Price: $.99, Version: 1.0 (iTunes) Description: | Read more »
Partia 2 (Games)
Partia 2 1.0.1 Device: iOS Universal Category: Games Price: $5.99, Version: 1.0.1 (iTunes) Description: Partia 2 is a SRPG (Strategy Role-playing) video game inspired by Fire Emblem and Tear Ring Saga series. In a high fantasy... | Read more »
Puzzle to the Center of the Earth Review
Puzzle to the Center of the Earth Review By Campbell Bird on October 23rd, 2014 Our Rating: :: SPELUNKING PUZZLESUniversal App - Designed for iPhone and iPad Do some puzzles to make some platforms in this smart and fun free-to-play... | Read more »
Sleep Attack TD Review
Sleep Attack TD Review By Jennifer Allen on October 23rd, 2014 Our Rating: :: A TRUE TWISTUniversal App - Designed for iPhone and iPad Sleep Attack TD is a tower defense game with a difference – you can rotate the layout – and it’s... | Read more »
Mecanic (Education)
Mecanic 1.0 Device: iOS Universal Category: Education Price: $1.99, Version: 1.0 (iTunes) Description: Plates, screws, wheels ... Everything you need to achieve whatever you want... MECHANICWith 'MECANIC' kids will have fun... | Read more »
Earn Your Master Camper Badge in Camp Po...
Earn Your Master Camper Badge in Camp Pokemon Posted by Jessica Fisher on October 23rd, 2014 [ permalink ] Universal App - Designed for iPhone and iPad | Read more »
Garruk Gets His Revenge in a New Magic 2...
Garruk Gets His Revenge in a New Magic 2015 Expansion, Coming This November Posted by Jessica Fisher on October 23rd, 2014 [ permalink ] | Read more »
Sentinels of the Multiverse Review
Sentinels of the Multiverse Review By Rob Thomas on October 23rd, 2014 Our Rating: :: SENTINELS ASSEMBLEiPad Only App - Designed for the iPad Greater Than Games’ tabletop classic, Sentinels of the Multiverse swoops in to save the... | Read more »

Price Scanner via MacPrices.net

Save up to $125 on Retina MacBook Pros
B&H Photo has the new 2014 13″ and 15″ Retina MacBook Pros on sale for up to $125 off MSRP. Shipping is free, and B&H charges NY sales tax only. They’ll also include free copies of Parallels... Read more
Apple refurbished Time Capsules available sta...
The Apple Store has certified refurbished Time Capsules available for up to $60 off MSRP. Apple’s one-year warranty is included with each Time Capsule, and shipping is free: - 2TB Time Capsule: $255... Read more
Textilus New Word, Notes and PDF Processor fo...
Textilus is new word-crunching, notes, and PDF processor designed exclusively for the iPad. I haven’t had time to thoroughly check it out yet, but it looks great and early reviews are positive.... Read more
WD My Passport Pro Bus-Powered Thunderbolt RA...
WD’s My Passport Pro RAID solution is powered by an integrated Thunderbolt cable for true portability and speeds as high as 233 MB/s. HighlightsOverviewSpecifications Transfer, Back Up And Edit In... Read more
Save with Best Buy’s College Student Deals
Take an additional $50 off all MacBooks and iMacs at Best Buy Online with their College Students Deals Savings, valid through November 1st. Anyone with a valid .EDU email address can take advantage... Read more
iPad Air 2 & iPad mini 3 Best Tablets Yet...
The new iPads turned out to be pretty much everything I’d been hoping for and more than I’d expected.”More” particularly in terms of a drinking-from-a-firehose choice of models and configurations,... Read more
Drafts 4 Reinvents iOS Productivity App
N Richland Hills, Texas based Agile Tortoise has announced the release of Drafts 4 for iPhone and iPad. Drafts is a quick capture note taking app with flexible output actions. Drafts 4 scales from... Read more
AT&T accepting preorders for new iPads fo...
AT&T Wireless is accepting preorders for the new iPad Air 2 and iPad mini 3, cellular models, for $100 off MSRP with a 2-year service agreement: - 16GB iPad Air 2 WiFi + Cellular: $529.99 - 64GB... Read more
Apple offering refurbished Mac Pros for up to...
The Apple Store is offering Apple Certified Refurbished 2013 Mac Pros for up to $600 off the cost of new models. An Apple one-year warranty is included with each Mac Pro, and shipping is free. The... Read more
Select MacBook Airs $100 off MSRP, free shipp...
B&H Photo has 2014 a couple of MacBook Airs on sale for $100 off MSRP. Shipping is free, and B&H charges NY sales tax only. They also include free copies of Parallels Desktop and LoJack for... Read more

Jobs Board

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
*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
Project Manager / Business Analyst, WW *Appl...
…a senior project manager / business analyst to work within our Worldwide Apple Fulfillment Operations and the Business Process Re-engineering team. This role will work Read more
*Apple* Retail - Multiple Positions (US) - A...
Job Description: Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, Read more
Position Opening at *Apple* - Apple (United...
…customers purchase our products, you're the one who helps them get more out of their new Apple technology. Your day in the Apple Store is filled with a range of Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.