TweetFollow Us on Twitter

Summer 91 - Apple II Q& A

Apple II Q& A

Apple II DEVELOPER TECHNICAL SUPPORT

Q Our Apple IIGS® TextEdit field created with NewControl2 appears to be redrawn within the TESetText call, but Apple II GS Toolbox Reference Volume 3 says controls won't be redrawn until the next update event. Is this a mistake in the documentation or in our logic?

A Internally, TextEdit uses control records for all TextEdit records. The main difference between control and noncontrol records is that the control defproc handles many of the standard TextEdit functions without requiring your application to do so. In the case of TESetText, though, TextEdit will always redraw the entire viewRect. This is a mistake in the manual.

Q We want to load $BC files from a folder when our program is launched. How do we ask the Apple II GS System Loader to discard these loaded files at application shutdown time? We tried using the main program's master ID from the Memory Manager, but the files are still not unloaded.

A The Loader is not designed to support more than one program with one user ID. It assumes that InitialLoad or InitialLoad2 will be called with distinct user IDs for each "program" to be controlled individually.

You need to get new user IDs (probably $1000 type) for each module you load, so that you can call UserShutDown on each of them individually when you need to. Don't dispose of the memory at the end; call UserShutDown on each of the IDs and the Loader will take care of the rest. If you're not quitting, you might want to shut them down in zombie state so that they don't have to be reloaded from disk if the memory is available. You can just pass $1000 as the user ID to InitialLoad and it will get a new ID for you and return it on the stack.

Remember that $BC auxiliary types are reserved and must be assigned by Apple Developer Technical Support.

Q How can I turn off the GS/OS file system cache, or keep it from writing to a disk while my file system optimizer is running?

A Altering volumes at the block level will confuse GS/OS ® , because the ProDOS® File System Translator (FST) keeps copies of file system structures that aren't in the cache. You need to use DWrite, although using DWrite instead of WRITE_BLOCK risks destroying the integrity of any open files on disk, such as the system resource file. If you use WRITE_BLOCK, you must close any open files, including the system resource file if you optimize the boot disk.

Once you start optimizing, don't make any calls that could directly or indirectly result in operating system calls--no DA access, no Font Manager calls, no loading tools, nothing. When you're done, GS/OS's internal volume control records (VCRs) will be completely invalid and you'll have to call OSShutDown.

Q When is it OK to make Apple II GS system service calls? I'd like to make calls such as MOVE_INFO from a driver that's executing asynchronously.

A It's OK to make system service calls in response to a GS/OS request, for example. Most of them require the OS environment, such as GS/OS's direct page, but MOVE_INFO, SET_SYS_SPEED, DYN_SLOT_ARBITER, and SIGNAL do not. When you're not in the GS/OS environment, make sure the proper language card bank of bank 1 is swapped in. Just JSLing there will put you into something that's not a system service call. You can either use the bank $E1 equivalents of MOVE_INFO, SET_SYS_SPEED, and DYN_SLOT_ARBITER, or you can make sure that the right $01 language card bank is enabled:

    short
    lda >$E0C068
    pha
    lda >$E0C08B
    lda >$E0C08B
    longmx
; Set up the registers and make your
; JSL  My_Favorite_SysSrv_Call
    short
    lda >$E0C083
    lda >$E0C083
    pla
    sta >$E0C068
    longmx

Q Do I have to write extra program code for my Apple II GS program to grow a resource?

A No, it's pretty straightforward. All you have to do to modify the content of any resource (including growing it) is to load the resource in, make any changes you want to the handle (such as change the data inside or call SetHandleSize to make it bigger), and then call MarkResourceChange. The Resource Manager updates the contents of your file when you call UpdateResourceFile. The Resource Manager recognizes the change in the size of the handle automatically.

Q The Apple IIGS does not seem to sort out equivalent devices on the Apple Desktop Bus TM (ADB) as the Macintosh does and as outlined in the ADB specification. We want multiple keyboard support, but the Apple IIGS ADB micro just begins reading blindly from addresses 2 and 3, assuming one keyboard and one mouse are attached. Is this information correct?

A The Apple IIGS does not do the same kind of dynamic device mapping and remapping that the Macintosh ADB Manager does. The "Apple Desktop Bus Tool Set" chapter of the Apple IIGS Toolbox Reference gives instructions on how to remap devices dynamically yourself. Essentially, you have two options:

  • You can leave the second keyboard address as 2, allowing input from multiple keyboards, but the keyboards' modifier key input will be mixed.
  • You can dynamically remap the keyboards in your program or in an INIT (although some forms of remapping require the user to press a key on the device to be remapped) and then a second keyboard will not appear as the standard keyboard--requiring all who use it to do their own ADB requests to get at the information entered from a second keyboard.

If you don't expect many developers to use a second keyboard, you might just choose to remap it inside any program that uses it. You could write an external library or functions that remap a second keyboard and read from it.

Q Where can I find documentation on how to recognize SCSI partitions, such as MS DOS partitions, from GS/OS?

A The documents you'll need are the GS/OS Reference (Addison-Wesley) and the GS/OS Device Driver Reference (APDA). You can recognize SCSI hard disk partitions programmatically by looking for a SCSI Hard Drive device type ($0005) and a forwardLink or headLink that's nonzero. This will give you all SCSI hard disk partitions, but it won't give you non-SCSI partitions, which have a different device type.

Bit 13 of the Device Characteristics word is for "Linked devices" like partitions, but the GS/OS Device Driver Reference says that bit applies to removable media, so not all third-party GS/OS drivers may set that bit for partitions (even though Apple's SCSI hard disk driver does).

Remember that GS/OS requires each partition to appear as a separate device, so there's no support for multiple partitions on one logical device.


Kudos to our readers who care enough to ask us terrific and well thought-out questions. The answers are supplied by our teams of technical gurus; our thanks to all. Special thanks to Matt Deatherage, C. K. Haun, Jim Luther, and Jim Mensch for the material in this Q & A column. *

Have more questions? Need more answers? Take a look at the Dev Tech Answers library on AppleLink (updated weekly) or at the Q & A stack on the Developer Essentials disc. *

 

Community Search:
MacTech Search:

Software Updates via MacUpdate

Kodi 15.0.beta1 - Powerful media center...
Kodi (was XBMC) is an award-winning free and open-source (GPL) software media player and entertainment hub that can be installed on Linux, OS X, Windows, iOS, and Android, featuring a 10-foot user... Read more
DiskCatalogMaker 6.4.12 - Catalog your d...
DiskCatalogMaker is a simple disk management tool which catalogs disks. Simple, light-weight, and fast. Finder-like intuitive look and feel. Super-fast search algorithm. Can compress catalog data... Read more
Macs Fan Control 1.3.0.0 - Monitor and c...
Macs Fan Control allows you to monitor and control almost any aspect of your computer's fans, with support for controlling fan speed, temperature sensors pane, menu-bar icon, and autostart with... Read more
Lyn 1.5.11 - Lightweight image browser a...
Lyn is a lightweight and fast image browser and viewer designed for photographers, graphic artists and Web designers. Featuring an extremely versatile and aesthetically pleasing interface, it... Read more
NeoOffice 2014.11 - Mac-tailored, OpenOf...
NeoOffice is a complete office suite for OS X. With NeoOffice, users can view, edit, and save OpenOffice documents, PDF files, and most Microsoft Word, Excel, and PowerPoint documents. NeoOffice 3.x... Read more
LaunchBar 6.4 - Powerful file/URL/email...
LaunchBar is an award-winning productivity utility that offers an amazingly intuitive and efficient way to search and access any kind of information stored on your computer or on the Web. It provides... Read more
Remotix 3.1.4 - Access all your computer...
Remotix is a fast and powerful application to easily access multiple Macs (and PCs) from your own Mac. Features Complete Apple Screen Sharing support - including Mac OS X login, clipboard... Read more
DesktopLyrics 2.6.6 - Displays current i...
DesktopLyrics is an application that displays the lyrics of the song currently playing in "iTunes" right on your desktop. The lyrics for the song have to be set in iTunes; DesktopLyrics does nothing... Read more
VOX 2.5.1 - Music player that supports m...
VOX is a beautiful music player that supports many filetypes. The beauty is in its simplicity, yet behind the minimal exterior lies a powerful music player with a ton of features and support for all... Read more
Microsoft Remote Desktop 8.0.18 - Connec...
With Microsoft Remote Desktop, you can connect to a remote PC and your work resources from almost anywhere. Experience the power of Windows with RemoteFX in a Remote Desktop client designed to help... Read more

Biz Builder Delux (Games)
Biz Builder Delux 1.0.0 Device: iOS Universal Category: Games Price: $4.99, Version: 1.0.0 (iTunes) Description: Ah, there's nothing like the rhythmic bustle of a burgeoning business burg... especially when you're the one building it... | Read more »
Auroch Digital is Bringing Back Games Wo...
| Read more »
Carbo - Handwriting in the Digital Age...
Carbo - Handwriting in the Digital Age 1.0 Device: iOS Universal Category: Productivity Price: $3.99, Version: 1.0 (iTunes) Description: | Read more »
Draggy Dead (Games)
Draggy Dead 1.1 Device: iOS Universal Category: Games Price: $.99, Version: 1.1 (iTunes) Description: Ditch your dead end job and take up a rewarding career in Grave Robbing today!Guide the recently deceased to a fun filled life of... | Read more »
Bad Dinos (Games)
Bad Dinos 1.0.0 Device: iOS Universal Category: Games Price: $2.99, Version: 1.0.0 (iTunes) Description: | Read more »
The Apple Watch isn't Great as a Fi...
| Read more »
Show the World What You See With Stre.am...
Live broadcasting is getting popular on mobile devices, which is why you can now get Stre.am, by Infinite Takes. [Read more] | Read more »
PhotoTime's 2.1 Update Adds Apple W...
The latest PhotoTime update is adding even more functionality to the handy photo organizing app. Yep, including Apple Watch support. [Read more] | Read more »
Oh My Glob! Adventure Time Puzzle Quest...
Finn and Jake are taking over D3 Go!'s popular puzzle game series in the upcoming Adventure Time Puzzle Quest. [Read more] | Read more »
Earthcore: Shattered Elements - Tips, Tr...
At first glance, Earthcore: Shattered Elements seems like a rather simple card-battling game. Once you’re introduced to skills that will change quite a bit. Even more so once you start to acquire hero cards. But it’s not so complicated that we... | Read more »

Price Scanner via MacPrices.net

Memorial Day Weekend Sale: New 27-inch 3.3GHz...
Best Buy has the new 27″ 3.3GHz 5K iMac on sale for $1899.99 this weekend. Choose free shipping or free local store pickup (if available). Sale price for online orders only, in-store prices may vary... Read more
OtterBox Maximizes Portability, Productivity...
From the kitchen recipe book to the boarsroom presentation, the OtterBox Agility Tablet System turns tablets into one of the most versatile pieces of handheld technology available. Available now, the... Read more
Launch of New Car App Gallery and Open Develo...
Automatic, a company on a mission to bring the power of the Internet into every car, has announced the launch of the Automatic App Gallery, an app store for nearly every car or truck on the road... Read more
Memorial Day Weekend Sale: 13-inch 1.6GHz Mac...
Best Buy has the new 13″ 1.6GHz/128GB MacBook Air on sale for $849 on their online store this weekend. Choose free shipping or free local store pickup (if available). Sale price for online orders... Read more
Memorial Day Weekend Sale: 27-inch 3.5GHz 5K...
Best Buy has the 27″ 3.5GHz 5K iMac on sale for $2099.99 this weekend. Choose free shipping or free local store pickup (if available). Sale price for online orders only, in-store prices may vary.... Read more
Sale! 16GB iPad mini 3 for $349, save $50
B&H Photo has the 16GB iPad mini 3 WiFi on sale for $349 including free shipping plus NY sales tax only. Their price is $50 off MSRP, and it’s the lowest price available for this model. Read more
Price drop on 2014 15-inch Retina MacBook Pro...
B&H Photo has dropped prices on 2014 15″ Retina MacBook Pros by $200. Shipping is free, and B&H charges NY sales tax only: - 15″ 2.2GHz Retina MacBook Pro: $1799.99 save $200 - 15″ 2.5GHz... Read more
With a Mission to Make Mobile Free, Scratch W...
Scratch Wireless, claiming to be the world’s first truly free mobile service, has announced the availability of a new Scratch-enabled Android smartphone, the Coolpad Arise. The smartphone is equipped... Read more
First-Ever Titanium Alloy Curved iPhone 6 Scr...
One of the most common problems with mobile phones is damage to the screens. The slightest drop can cause a dreaded spider web of gashes and cracks in the glass panel surface that can cost $hundreds... Read more
Preorder new 12-inch MacBook, $10 off, save o...
Adorama has new 12″ Retina MacBooks available for preorder for $10 off MSRP including free shipping plus NY & NJ sales tax only. For a limited time, Adorama will include a free Apple USB-C to USB... Read more

Jobs Board

*Apple* Solutions Consultant - Retail Sales...
**Job Summary** As an Apple Solutions Consultant (ASC) you are the link between our customers and our products. Your role is to drive the Apple business in a retail Read more
*Apple* TV Live Streaming Frameworks Test En...
**Job Summary** Work and contribute towards the engineering of Apple 's state-of-the-art products involving video, audio, and graphics in Interactive Media Group (IMG) at Read more
*Apple* Retail - Multiple Positions (US) - A...
Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, you're also the Read more
Partner Marketing Manager, Merchant- *Apple*...
**Job Summary** The Apple Pay partner marketing team is looking for a marketing manager to develop and drive US marketing programs with our merchant partners. The right Read more
Technical Project Manager - *Apple* Pay - A...
**Job Summary** Apple Pay is seeking an experienced technical PM to…manage the on boarding of new merchants for the Apple Pay platform in the US Within this role you Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.