TweetFollow Us on Twitter

Winter 91 - A2 Q&A



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:

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

dc.b $EE     ;quit type 
dc.w path    ;addr of 
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

Microsoft Office 2016 16.11 - Popular pr...
Microsoft Office 2016 - Unmistakably Office, designed for Mac. The new versions of Word, Excel, PowerPoint, Outlook, and OneNote provide the best of both worlds for Mac users - the familiar Office... Read more
Adobe Photoshop CC 2018 19.1.2 - Profess...
Photoshop CC 2018 is available as part of Adobe Creative Cloud for as little as $19.99/month (or $9.99/month if you're a previous Photoshop customer). Adobe Photoshop CC 2018, the industry standard... Read more
Adobe Dreamweaver CC 2018 -...
Dreamweaver CC 2018 is available as part of Adobe Creative Cloud for as little as $19.99/month (or $9.99/month if you're a previous Dreamweaver customer). Adobe Dreamweaver CC 2018 allows you to... Read more
Adobe Flash Player - Plug-in...
Adobe Flash Player is a cross-platform, browser-based application runtime that provides uncompromised viewing of expressive applications, content, and videos across browsers and operating systems.... Read more
Drive Genius 5.2.0 - $79.00
Drive Genius features a comprehensive Malware Scan. Automate your malware protection. Protect your investment from any threat. The Malware Scan is part of the automated DrivePulse utility. DrivePulse... Read more
MegaSeg 6.0.6 - Professional DJ and radi...
MegaSeg is a complete solution for pro audio/video DJ mixing, radio automation, and music scheduling with rock-solid performance and an easy-to-use design. Mix with visual waveforms and Magic... Read more
ffWorks 1.0.7 - Convert multimedia files...
ffWorks (was iFFmpeg), focused on simplicity, brings a fresh approach to the use of FFmpeg, allowing you to create ultra-high-quality movies without the need to write a single line of code on the... Read more
Dash 4.1.5 - Instant search and offline...
Dash is an API documentation browser and code snippet manager. Dash helps you store snippets of code, as well as instantly search and browse documentation for almost any API you might use (for a full... Read more
Evernote 7.0.3 - 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
jAlbum Pro 15.3 - Organize your digital...
jAlbum Pro has all the features you love in jAlbum, but comes with a commercial license. You can create gorgeous custom photo galleries for the Web without writing a line of code! Beginner-friendly... Read more

Latest Forum Discussions

See All

All the best games on sale for iPhone an...
It might not have been the greatest week for new releases on the App Store, but don't let that get you down, because there are some truly incredible games on sale for iPhone and iPad right now. Seriously, you could buy anything on this list and I... | Read more »
Everything You Need to Know About The Fo...
In just over a week, Epic Games has made a flurry of announcements. First, they revealed that Fortnite—their ultra-popular PUBG competitor—is coming to mobile. This was followed by brief sign-up period for interested beta testers before sending out... | Read more »
The best games that came out for iPhone...
It's not been the best week for games on the App Store. There are a few decent ones here and there, but nothing that's really going to make you throw down what you're doing and run to the nearest WiFi hotspot in order to download it. That's not to... | Read more »
Death Coming (Games)
Death Coming Device: iOS Universal Category: Games Price: $1.99, Version: (iTunes) Description: --- Background Story ---You Died. Pure and simple, but death was not the end. You have become an agent of Death: a... | Read more »
Hints, tips, and tricks for Empires and...
Empires and Puzzles is a slick match-stuff RPG that mixes in a bunch of city-building aspects to keep things fresh. And it's currently the Game of the Day over on the App Store. So, if you're picking it up for the first time today, we thought it'd... | Read more »
What You Need to Know About Sam Barlow’s...
Sam Barlow’s follow up to Her Story is #WarGames, an interactive video series that reimagines the 1983 film WarGames in a more present day context. It’s not exactly a game, but it’s definitely still interesting. Here are the top things you should... | Read more »
Pixel Plex Guide - How to Build Better T...
Pixel Plex is the latest city builder that has come to the App Store, and it takes a pretty different tact than the ones that came before it. Instead of being in charge of your own city by yourself, you have to work together with other players to... | Read more »
Fortnite Will Be Better Than PUBG on Mob...
Before last week, if you asked me which game I prefer between Fortnite Battle Royale and PlayerUnknown’s Battlegrounds (PUBG), I’d choose the latter just about 100% of the time. Now that we know that both games are primed to hit our mobile screens... | Read more »
Siege of Dragonspear (Games)
Siege of Dragonspear 2.5.12 Device: iOS Universal Category: Games Price: $9.99, Version: 2.5.12 (iTunes) Description: Experience the Siege of Dragonspear, an epic Baldur’s Gate tale, filled with with intrigue, magic, and monsters.... | Read more »
7 Wonders Guide - Should You Buy The Lea...
The fantastic mobile version of 7 Wonders just got updated with an expansion that adds Leaders to the game. This new content adds a whole layer of depth to the game, but before you spend $1.99 to buy it blindly, check out this breakdown of exactly... | Read more »

Price Scanner via

B&H drops prices on 15″ MacBook Pros up t...
B&H Photo has dropped prices on new 2017 15″ MacBook Pros, now up to $300 off MSRP and matching Adorama’s price drop yesterday. Shipping is free, and B&H charges sales tax for NY & NJ... Read more
Apple restocks Certified Refurbished 2017 13″...
Apple has restocked Certified Refurbished 2017 13″ 2.3GHz MacBook Pros for $200-$230 off MSRP. A standard Apple one-year warranty is included with each MacBook, models receive new outer cases, and... Read more
13″ Space Gray Touch Bar MacBook Pros on sale...
Adorama has new 2017 13″ Space Gray Touch Bar MacBook Pros on sale for $150 off MSRP. Shipping is free, and Adorama charges sales tax in NY & NJ only: – 13″ 3.1GHz/256GB Space Gray MacBook Pro (... Read more
Best deal of the year on 15″ Apple MacBook Pr...
Adorama has New 2017 15″ MacBook Pros on sale for up to $300 off MSRP. Shipping is free, and Adorama charges sales tax in NJ and NY only: – 15″ 2.8GHz Touch Bar MacBook Pro Space Gray (MPTR2LL/A): $... Read more
Save $100-$150+ on 13″ Touch Bar MacBook Pros...
B&H Photo has 13″ Touch Bar MacBook Pros on sale for $100-$150 off MSRP. Shipping is free, and B&H charges sales tax for NY & NJ residents only: – 13″ 3.1GHz/256GB Space Gray MacBook Pro... Read more
Current deals on 27″ Apple iMacs, models up t...
B&H Photo has 27″ iMacs on sale for up to $150 off MSRP. Shipping is free, and B&H charges sales tax for NY & NJ residents only: – 27″ 3.8GHz iMac (MNED2LL/A): $2149 $150 off MSRP – 27″ 3... Read more
Thursday Deal: 13″ 2.3GHz MacBook Pro for $11...
B&H Photo has the 13″ 2.3GHz/128GB Space Gray MacBook Pro on sale for $100 off MSRP. Shipping is free, and B&H charges sales tax for NY & NJ residents only: – 13-inch 2.3GHz/128GB Space... Read more
How to save $100-$190 on 10″ & 12″ iPad P...
Apple is now offering Certified Refurbished 2017 10″ and 12″ iPad Pros for $100-$190 off MSRP, depending on the model. An Apple one-year warranty is included with each model, and shipping is free: –... Read more
Silver 12″ 1.3GHz MacBook on sale at B&H...
B&H Photo has the 2017 12″ 1.3GHz Silver MacBook on sale for $1399.99 including free shipping plus sales tax for NY & NJ residents only. Their price is $200 off MSRP, and it’s the lowest... Read more
Amazon offers 21″ Apple iMacs for up to $150...
Amazon 21″ iMacs on sale today for $50-$150 off MSRP, depending on the model. Shipping is free: – 21″ 3.4GHz 4K iMac (MNE02LL/A): $1349.99 $150 off MSRP – 21″ 3.0GHz iMac (MNDY2LL/A): $1199 $100 off... Read more

Jobs Board

Data Scientist, *Apple* Ecosystem (AMP Anal...
# Data Scientist, Apple Ecosystem (AMP Analytics) Job Number: 113428728 Santa Clara Valley, California, United States Posted: 24-Jan-2018 Weekly Hours: 40.00 **Job Read more
*Apple* Solutions Consultant - Apple (United...
# Apple Solutions Consultant Job Number: 113523441 Orange, CA, California, United States Posted: 21-Feb-2018 Weekly Hours: 40.00 **Job Summary** Are you passionate Read more
*Apple* Professional Learning Specialist - A...
# Apple Professional Learning Specialist Job Number: 113456892 Englewood, NJ, New Jersey, United States Posted: 02-Feb-2018 Weekly Hours: 40.00 **Job Summary** The Read more
*Apple* Retail Online, Senior Financial Anal...
# Apple Retail Online, Senior Financial Analyst Job Number: 57228835 Santa Clara Valley, California, United States Posted: 12-Feb-2018 Weekly Hours: 40.00 **Job Read more
Site Reliability Engineer, *Apple* Pay - Ap...
# Site Reliability Engineer, Apple Pay Job Number: 113356036 Santa Clara Valley, California, United States Posted: 12-Jan-2018 Weekly Hours: 40.00 **Job Summary** Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.