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. *

 
AAPL
$105.03
Apple Inc.
+0.20
MSFT
$46.01
Microsoft Corpora
+0.99
GOOG
$538.97
Google Inc.
-5.01

MacTech Search:
Community Search:

Software Updates via MacUpdate

OS X Server 4.0 - For OS X 10.10 Yosemit...
Designed for OS X and iOS devices, OS X Server makes it easy to share files, schedule meetings, synchronize contacts, develop software, host your own website, publish wikis, configure Mac, iPhone,... Read more
TotalFinder 1.6.12 - Adds tabs, hotkeys,...
TotalFinder is a universally acclaimed navigational companion for your Mac. Enhance your Mac's Finder with features so smart and convenient, you won't believe you ever lived without them. Tab-based... Read more
BusyCal 2.6.3 - Powerful calendar app wi...
BusyCal is an award-winning desktop calendar that combines personal productivity features for individuals with powerful calendar sharing capabilities for families and workgroups. BusyCal's unique... Read more
calibre 2.7 - Complete e-library managem...
Calibre is a complete e-book library manager. Organize your collection, convert your books to multiple formats, and sync with all of your devices. Let Calibre be your multi-tasking digital... Read more
Skitch 2.7.3 - Take screenshots, annotat...
With Skitch, taking, annotating, and sharing screenshots or images is as fun as it is simple.Communicate and collaborate with images using Skitch and its intuitive, engaging drawing and annotating... Read more
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

Latest Forum Discussions

See All

Rami Ismail Opens Up distribute​() for D...
Rami Ismail Opens Up distribute​() for Developers Posted by Jessica Fisher on October 24th, 2014 [ permalink ] Rami Ismail, Chief Executive of Business and Development at indie game studio | Read more »
Great Hitman GO Goes on Sale and Gets Ne...
Great Hitman GO Goes on Sale and Gets New Update – Say That Three Times Fast Posted by Jessica Fisher on October 24th, 2014 [ permalink ] | Read more »
Rival Stars Basketball Review
Rival Stars Basketball Review By Jennifer Allen on October 24th, 2014 Our Rating: :: RESTRICTIVE BUT FUNUniversal App - Designed for iPhone and iPad Rival Stars Basketball is a fun mixture of basketball and card collecting but its... | Read more »
Rubicon Development Makes Over a Dozen o...
Rubicon Development Makes Over a Dozen of Their Games Free For This Weekend Only Posted by Jessica Fisher on October 24th, 2014 [ permalink ] | Read more »
I Am Dolphin Review
I Am Dolphin Review By Jennifer Allen on October 24th, 2014 Our Rating: :: NEARLY FIN-TASTICUniversal App - Designed for iPhone and iPad Swim around and eat nearly everything that moves in I Am Dolphin, a fun Ecco-ish kind of game... | Read more »
nPlayer looks to be the ultimate choice...
Developed by Newin Inc, nPlayer may seem like your standard video player – but is aiming to be the best in its field by providing high quality video play performance and support for a huge number of video formats and codecs. User reviews include... | Read more »
Fighting Fantasy: Caverns of the Snow Wi...
Fighting Fantasy: Caverns of the Snow Witch Review By Jennifer Allen on October 24th, 2014 Our Rating: :: CLASSY STORYTELLINGUniversal App - Designed for iPhone and iPad Fighting Fantasy: Caverns of the Snow Witch is a sterling... | Read more »
A Few Days Left (Games)
A Few Days Left 1.01 Device: iOS Universal Category: Games Price: $3.99, Version: 1.01 (iTunes) Description: Screenshots are in compliance to App Store's 4+ age rating! Please see App Preview for real game play! **Important: Make... | Read more »
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 »

Price Scanner via MacPrices.net

Nimbus Note Cross=Platform Notes Utility
Nimbus Note will make sure you never forget or lose your valuable data again. Create and edit notes, save web pages, screenshots and any other type of data – and share it all with your friends and... Read more
NewerTech’s Snuglet Makes MagSafe 2 Power Con...
NewerTech has introduced the Snuglet, a precision-manufactured ring designed to sit inside your MagSafe 2 connector port, providing a more snug fit to prevent your power cable from unintentional... Read more
Apple Planning To Sacrifice Gross Margins To...
Digitimes Research’s Jim Hsiao says its analysts believe Apple is planning to sacrifice its gross margins to save its tablet business, which has recently fallen into decline. They project that Apple’... Read more
Who’s On Now? – First Instant-Connect Search...
It’s nighttime and your car has broken down on the side of the highway. You need a tow truck right away, so you open an app on your iPhone, search for the closest tow truck and send an instant... Read more
13-inch 2.5GHz MacBook Pro on sale for $949,...
Best Buy has the 13″ 2.5GHz MacBook Pro available for $949.99 on their online store. Choose free shipping or free instant local store pickup (if available). Their price is $150 off MSRP. Price is... Read more
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

Jobs Board

*Apple* Solutions Consultant - Apple Inc. (U...
…important role that the ASC serves is that of providing an excellent Apple Customer Experience. Responsibilities include: * Promoting Apple products and solutions Read more
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
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.