TweetFollow Us on Twitter

Winter 91 - A2 Q&A

APPLE II Q & A

APPLE II DEVEOPER TECHNICAL SUPPORT

QThe Apple IIGS® GS/OS Reference, page 43, alludes to "an enhanced ProDOS ® 8 QUIT call, which contains a pathname to an application to be launched." However, I find no mention of this enhancement in the ProDOS 8 Technical Reference. How do I use this call?

AThe enhanced ProDOS 8 QUIT call allows you to quit to another application if GS/OS or ProDOS 16 has been booted. The enhanced ProDOS 8 QUIT call requires either of the following four-count parameter blocks:

Standard
dc.b $00     ;quit type 
		     ;normal
dc.w $0000   ;null
dc.b $00     ;null
dc.w $0000   ;null

Extended
dc.b $EE     ;quit type 
		     ;enhanced
dc.w path    ;addr of 
		     ;launch 
		     ;pathname 
dc.b $00     ;reserved
dc.w $0000   ;reserved


path str 'myprog.sys16' 

GS/OS patches ProDOS 8 to get control on a QUIT and launches the next program if the quit type is $EE. The code to do this is not part of ProDOS 8; it doesn't fit in the kernel, and it can't go in the "quit code" because program selectors swap that out. The enhanced Quit call, therefore, works only when GS/OS has been booted.


QWhat's the difference between Apple II GS System Software versions 5.0.3 and 5.0.4?

AApple IIGS System 5.0.4 includes the following changes:

  • TOOL.SETUP for System Software 3.2 in May 1987 changed QDStartUp to make the cursor image handle safe and has now been changed for ROM 03 as well.
  • QuickDraw Auxiliary no longer returns bogus errors for SeedFill and CalcMask in pure 640 mode, and a low-level stack imbalance has been corrected.
  • The ImageWriter® and ImageWriter LQ drivers now spool to the User Path if the system was booted over AppleShare®. A bug concerning memory allocation has been fixed, and the drivers now check errors more robustly.
  • The SCSI Manager no longer resets the SCSI bus when the Manager is started.
  • The AppleShare FST now saves and restores the correct QuickDraw direct page locations when shielding the cursor to draw the AppleShare arrows.

QWhat do I need to get started with MPW IIGS?

AMPW IIGS is a set of tools and languages that creates Apple II and Apple IIGS programs and object code under the Macintosh MPW development environment. The system requirements for MPW are detailed inAPDAlog® in the MPW product description. In addition to MPW and a system suitable for it, you need the MPW IIGS Tools package, which contains necessary development tools like the linker and other useful tools such as the resource compiler, object module dumper, and ProDOS file duplicator. You will also need the MPW IIGS language of your choice--currently assembly, C, or Pascal.

QIf a task in the Heartbeat Interrupt Task queue has not yet been executed (the tick counter has not yet reached zero), is it possible to store a zero into the TaskCnt field to keep the system from ever executing the task?

AThis will work fine. If you know where the count word is, then you can set it to zero to prevent yourself from being called. The system does not keep this information in a separate buffer; it checks the value in the queue header each pass through the Heartbeat queue,so if you were at 200 one pass, and then 0 the next, the system will not be bothered because it does not remember the previous value. And because the task is not executed unless the system itself decrements the count to zero, storing a zero into theTaskCnt field is a fine way to prevent a task from executing.

QCan run queue tasks remove themselves?

AYes, run queue tasks can call Desk Manager RemoveFromRunQ on themselves without difficulty.

QCan QuickDraw II Auxiliary's CopyPixels call scale pixel images beyond maxWidth?

ANo, but you can use the QuickDraw II SetBufDims call to increase the size of the QuickDraw buffer to beyond what was specified for the maxWidth variable in the QDStartUp routine.

QHow do I port my Macintosh HyperCard ® stack to run with HyperCard II GS?

AYou can use HyperMover TM, which is available on AppleLink ® on developer CDs. HyperMover allows HyperCard 1.2.5 stacks from the Macintosh to run with little or no modification on the Apple II GS with HyperCard IIGS. HyperMover consists of two stacks, one for the Macintosh and one for the Apple II GS. HyperMover for the Macintosh creates a folder containing files that describe the stack you wish to convert to the II GS. This folder and the files it contains are then transferred to the II GS via Apple File Exchange or an AppleTalk network. HyperMover for the IIGS then rebuilds a stack as close as possible to the original stack using the files contained in this folder. The most noticeable difference between the original and the rebuilt stack will be in the graphics. Because the II GS and the Macintosh have such different sized screen displays, the graphics and objects of the rebuilt stack must be scaled to fit the II GS screen, resulting in some loss of detail.

HyperMover contains several features designed to make the rebuilt stack as useful and as close to the original stack as possible. It can create scaled representations of Macintosh pictures, convert Macintosh sounds to IIGS sounds and Macintosh icons to IIGS icons, and transfer all HyperCard objects including backgrounds, cards, buttons, and fields and their attributes. However, because HyperMover is a stack, it cannot convert XCMD/XFCNs and cannot fix scripts that need specific Macintosh screen coordinates to function.

QIs HyperTalk the same in HyperCard II GS as in Macintosh HyperCard?

AGenerally, HyperTalk® on the Apple II GS is the same as HyperCard 1.2.5 HyperTalk on the Macintosh, but the HyperTalk on the Apple II GS has an extended command set to support the features available in the Apple II GS environment. New commands are included for setting color properties of objects, painting properties, and printing. A new property for buttons called the family property also has been added.

QDoes HyperCard IIGS provide for extending the HyperTalk language?

AYes. External commands and functions, which are usually referred to as XCMDs and XFCNs, or externals as a general group, are functionally identical in the Macintosh HyperTalk and Apple IIGS HyperTalk software environments. XCMDs and XFCNs provide for extensions to the existing HyperTalk language and are called using the same methods as those for Macintosh HyperTalk. Modifications have to be made, however, to move existing source code for Macintosh externals into the Apple IIGS environment. HyperTalk callback procedures and interfaces for the Apple IIGSdiffer slightly from Macintosh HyperTalk.


Kudos to our readers who care enough to ask us terrific and well thought out questions. The answers to these puzzles have been supplied courtesy of our teams of technical gurus; our thanks to all. Special thanks to Matt Deatherage, C. K. Haun, Jim Luther, Eric Soldan, Dan Strnad, and Tim Swihart for the material in this Q & A column. *

Have more questions? Need more answers? Take a look at the new developer technical library on AppleLink (updated weekly) or the Q & A stack on each Developer CD Series disc. *

 

Community Search:
MacTech Search:

Software Updates via MacUpdate

How to become the ultimate robot warrior...
Chrono Strike is a delightfully immersive beat ‘em up with a sense of humor (any game with a good Sims reference gets points in my book). [Read more] | Read more »
Tips and tricks to get a higher score in...
Snow Roll is a devilish endless runner very much in the vein of Flappy Bird. It revels in its dastardly level of difficulty, and doesn’t really care how angry you get at it as it knows you’ll keep coming back for more. [Read more] | Read more »
How to win big in Slots Deluxe
Cheating while gambling is illegal and morally wrong, and in some parts of the world it leads to men with names like Vinnie "Six Knuckles" Manchenzo beating you to a pulp in a dark alley. [Read more] | Read more »
How to take over the world in Dictator 2
Running a country isn't easy - especially when you're a dictator who wants to take over the world and crush everyone in your path while you do it. [Read more] | Read more »
Tips and tricks to get a higher score in...
Tank.iois - you guessed it! - another multiplayer arena battler likeAgar.io and Slither.io. It does differentiate itself by putting you in a tiny tank though, so it's not exactly the same. To help you get that all-important high score, we've got a... | Read more »
How to unlock characters in One Tap Tenn...
As the title suggests, One Tap Tennis requires only a single tap to play its particular brand of tennis, and rewards you with a ton of unlockable characters if you perform well. Fortunately for you, we at 148Apps have got a few tips and tricks to... | Read more »
Grab it now: Game Craft’s Legend of War...
The real time strategy game is now available for you to sink your teeth into, through the App Store and Google Play. Combining elements of skill, strategy and empire building, Legend of War is a real gamers’ game. [Read more] | Read more »
Skateboard Party 3 ft. Greg Lutzka (Gam...
Skateboard Party 3 ft. Greg Lutzka 1.0 Device: iOS Universal Category: Games Price: $1.99, Version: 1.0 (iTunes) Description: Skateboard Party is back! This third edition of the popular sports franchise features professional skater... | Read more »
Cubious (Games)
Cubious 1.0 Device: iOS Universal Category: Games Price: $.99, Version: 1.0 (iTunes) Description: Cubious – How smart are you? How high is your IQube? Solve the impossible puzzles to find out, and help a lost little cube find his... | Read more »
Goat Simulator Waste of Space (Games)
Goat Simulator Waste of Space 1.1 Device: iOS Universal Category: Games Price: $4.99, Version: 1.1 (iTunes) Description: ** IMPORTANT - SUPPORTED DEVICESiPhone 4S, iPad 2, iPod Touch 5 or better.** | Read more »

Price Scanner via MacPrices.net

Enterprise Workers Pick Technology Over Perks...
New Adobe study shows surprising attitudes about office jobs and where the future of work is heading. Adobe has released survey findings revealing that a surprising 70 percent of U.S. office workers... Read more
Memorial Day Weekend Sale: $50-$100 off 11-in...
B&H Photo has 13″ and 11″ MacBook Airs with 256GB SSDs on sale for $50-$100 off MSRP. Shipping is free, and B&H charges NY sales tax only: - 11″ 1.6GHz/256GB MacBook Air: $999 $100 off MSRP... Read more
Memorial Day Weekend Sales: Apple MacBook Pro...
B&H Photo has 13″ and 15″ Retina MacBook Pros on sale for up to $210 off MSRP. Shipping is free, and B&H charges NY tax only: - 15″ 2.2GHz Retina MacBook Pro: $1799 $200 off MSRP - 15″ 2.5GHz... Read more
Memorial Day Weekend Sales: Apple iMacs and M...
Take up to $150 off the price of a new iMac or Mac mini at the following Apple resellers this Memorial Day weekend: iMacs: B&H Photo has 21″ and 27″ iMacs on sale for up to $150 off MSRP... Read more
Apple refurbished Retina MacBook Pros availab...
Apple has Certified Refurbished 2015 13″ and 15″ Retina MacBook Pros available for up to $380 off the cost of new models. An Apple one-year warranty is included with each model, and shipping is free... Read more
Apple refurbished 11-inch MacBook Airs availa...
Apple has Certified Refurbished 11″ MacBook Airs (the latest models), available for up to $170 off the cost of new models. An Apple one-year warranty is included with each MacBook, and shipping is... Read more
Goal Zero and OtterBox Partner to Expand iPh...
Goal Zero, specialists in portable power, have announced a partnership with OtterBox, brand smartphone case protection, to offer the Slide and Slide Plus Batteries as modules compatible with the new... Read more
15-inch Retina MacBook Pros on sale for up to...
B&H Photo has 15″ Retina MacBook Pros on sale for up to $210 off MSRP. Shipping is free, and B&H charges NY tax only: - 15″ 2.2GHz Retina MacBook Pro: $1799 $200 off MSRP - 15″ 2.5GHz Retina... Read more
Clearance 2015 13-inch MacBook Airs available...
B&H Photo has clearance 2015 13″ MacBook Airs available for $250 off original MSRP. Shipping is free, and B&H charges NY sales tax only: - 13″ 1.6GHz/4GB/128GB MacBook Air (MJVE2LL/A): $799... Read more
Apple refurbished Apple TVs available for up...
Apple has Certified Refurbished 32GB and 64GB Apple TVs available for up to $30 off the cost of new models. Apple’s standard one-year warranty is included with each model, and shipping is free: -... Read more

Jobs Board

Senior *Apple* Engineer - Signature Technol...
One-year contract for an Apple consultant. The resource should be an Apple Certified Technical Coordinator or get the certification within 60 days of starting Read more
*Apple* Architect - AECOM (United States)
**Requisition/Vacancy No.** 132759BR **Position Title** Apple Architect **Job Category** Information Technology **Business Line** Government **Country** United Read more
*Apple* Solutions Consultant - APPLE (United...
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
*Apple* Project Engineer - Smart Source Inc...
SmartSource is in need of an Apple Project Engineer for a 12 month contract opportunity in Pittsburg, PA. Role: Apple Project Engineer Location: Pittsburg, PA Read more
Automotive Sales Consultant - Apple Ford Linc...
…you. The best candidates are smart, technologically savvy and are customer focused. Apple Ford Lincoln Apple Valley is different, because: $30,000 annual salary Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.