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

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 »
Wildfulness - Unwind in nature and calm...
Wildfulness - Unwind in nature and calm your mind with nature sounds and illustrations 1.0 Device: iOS Universal Category: Healthcare & Fitness Price: $1.99, Version: 1.0 (iTunes) Description: Spending time in nature helps you to... | Read more »
Dr. Panda Racers (Education)
Dr. Panda Racers 1.0 Device: iOS Universal Category: Education Price: $2.99, Version: 1.0 (iTunes) Description: STEP ON THE GAS, RACE AND WIN!Fasten your seat belts and get ready to race! Speed your way to the finish line while doing... | 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
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
21-inch iMacs on sale for up to $120 off MSRP
B&H Photo has 21″ iMacs on sale for up to $120 off MSRP including free shipping plus NY sales tax only: - 21″ 3.1GHz iMac 4K: $1379.99 $120 off MSRP - 21″ 2.8GHz iMac: $1189 $110 off MSRP - 21″ 1... Read more
Kanex Introduces GoPower USB-C Rechargeable B...
Kanex has announced its GoPower USB-C portable battery for the USB-C MacBook, featuring the new industry standard connector and cable used for connectivity and power. Providing users with a new... Read more
Convertible and Detachable Devices Winning Ov...
According to the latest figures published by International Data Corporation (IDC), Western European shipments of ultraslim convertibles and detachables posted positive growth (44.7%) to account for... Read more
New MacBook Pros And Will MacBook Air Be Upgr...
With my mid-2013 13-inch MacBook Air closing on its third anniversary come November, I’m in system upgrade mode. Actually the Haswell CPU equipped Air is still doing a fine job, but my good wife is... Read more
Apple’s Education discount saves up to $300 o...
Purchase a new Mac or iPad using Apple’s Education Store and take up to $300 off MSRP. All teachers, students, and staff of any educational institution qualify for the discount. Shipping is free, and... Read more

Jobs Board

*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
Service Assistant - *Apple* Chevrolet *App...
Apple Automotive is one of the fastest growing dealer...and it shows. Consider making the switch to the Apple Automotive Group today! At Apple Automotive, we Read more
Editor, *Apple* News - APPLE (United States...
Job Summary The Apple News team is looking for a passionate and knowledgeable editor with experience covering entertainment/pop culture and experience running social Read more
*Apple* Nissan Service Technicians - Apple A...
Apple Automotive is one of the fastest growing dealer...and it shows. Consider making the switch to the Apple Automotive Group today! At Apple Automotive , Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.