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

SpamSieve 2.9.38 - Robust spam filter fo...
SpamSieve is a robust spam filter for major email clients that uses powerful Bayesian spam filtering. SpamSieve understands what your spam looks like in order to block it all, but also learns what... Read more
TeamViewer 15.0.8397 - Establish remote...
TeamViewer gives you remote control of any computer or Mac over the Internet within seconds or can be used for online meetings. Find out why more than 200 million users trust TeamViewer! Free for non... Read more
SteerMouse 5.4.3 - Powerful third-party...
SteerMouse is an advanced driver for USB and Bluetooth mice. SteerMouse can assign various functions to buttons that Apple's software does not allow, including double-clicks, modifier clicks,... Read more
Toast Titanium 18.2.1 - The ultimate med...
Roxio Toast Titanium, the leading DVD burner for Mac, makes burning even better, adding Roxio Secure Burn to protect your files on disc and USB in Mac- or Windows-compatible formats. Get more style... Read more
HoudahSpot 5.0.11 - Advanced file-search...
HoudahSpot is a versatile desktop search tool. Use HoudahSpot to locate hard-to-find files and keep frequently used files within reach. HoudahSpot will immediately feel familiar. It works just the... Read more
ClipGrab 3.8.6 - Download videos from Yo...
ClipGrab is a free downloader and converter for YouTube, Vimeo, Facebook and many other online video sites. It converts downloaded videos to MPEG4, MP3 or other formats in just one easy step Version... Read more
ExpanDrive 7.4.0 - Access cloud storage...
ExpanDrive builds cloud storage in every application, acts just like a USB drive plugged into your Mac. With ExpanDrive, you can securely access any remote file server directly from the Finder or... Read more
Adobe Dreamweaver CC 2020 20.0 - Build w...
Dreamweaver CC 2020 is available as part of Adobe Creative Cloud for as little as $20.99/month (or $9.99/month if you're a previous Dreamweaver customer). Adobe Dreamweaver CC 2020 allows you to... Read more
Eye Candy 7.2.3.85 - 30 professional Pho...
Eye Candy renders realistic effects that are difficult or impossible to achieve in Photoshop alone, such as Fire, Chrome, and the new Lightning. Effects like Animal Fur, Smoke, and Reptile Skin are... Read more
Sparkle Pro 2.8.5 - Visual website creat...
Sparkle Pro will change your mind if you thought building websites wasn't for you. Sparkle is the intuitive site builder that lets you create sites for your online portfolio, team or band pages, or... Read more

Latest Forum Discussions

See All

Pre-register for Hello Kitty AR: Kawaii...
Hello Kitty — the cute cat that launched a multi-billion-pound franchise — has been brought to life… sort of. Sanrio has teamed up with the Bublar Group to create a new mobile game that uses AR tech to turn the real world into Hello Kitty’s... | Read more »
Gorgeous and tranquil puzzler Spring Fal...
One-man indie studio SPARSE//GameDev has now launched its tranquil puzzler, Spring Falls. It's described as "a peaceful puzzle game about water, erosion, and watching things grow". [Read more] | Read more »
Black Desert Mobile gets an official rel...
Pearl Abyss has just announced that its highly-anticipated MMO, Black Desert Mobile, will launch globally for iOS and Android on December 11th. [Read more] | Read more »
Another Eden receives new a episode, cha...
Another Eden, WFS' popular RPG, has received another update that brings new story content to the game alongside a few new heroes to discover. [Read more] | Read more »
Overdox guide - Tips and tricks for begi...
Overdox is a clever battle royale that changes things up by adding MOBA mechanics and melee combat to the mix. This new hybrid game can be quite a bit to take in at first, so we’ve put together a list of tips to help you get a leg up on the... | Read more »
Roterra Extreme - Great Escape is a pers...
Roterra Extreme – Great Escape has been described by developers Dig-It Games as a mini-sequel to their acclaimed title Roterra: Flip the Fairytale. It continues that game's tradition of messing with which way is up, tasking you with solving... | Read more »
Hearthstone: Battlegrounds open beta lau...
Remember earlier this year when auto battlers were the latest hotness? We had Auto Chess, DOTA Underlords, Chess Rush, and more all gunning for our attention. They all had their own reasons to play, but, at least from where I'm standing, most... | Read more »
The House of Da Vinci 2 gets a new gamep...
The House of Da Vinci launched all the way back in 2017. Now, developer Blue Brain Games is gearing up to deliver a second dose of The Room-inspired puzzling. Some fresh details have now emerged, alongside the game's first official trailer. [Read... | Read more »
Shoot 'em up action awaits in Battl...
BattleBrew Productions has just introduced another entry into its award winning, barrelpunk inspired, BattleSky Brigade series. Whilst its previous title BattleSky Brigade TapTap provided fans with idle town building gameplay, this time the... | Read more »
Arcade classic R-Type Dimensions EX blas...
If you're a long time fan of shmups and have been looking for something to play lately, Tozai Games may have just released an ideal game for you on iOS. R-Type Dimensions EX brings the first R-Type and its sequel to iOS devices. [Read more] | Read more »

Price Scanner via MacPrices.net

13″ 2.4GHz MacBook Pros available for up to $...
Apple has a full line of Certified Refurbished 2019 13″ 2.4GHz 4-Core Touch Bar MacBook Pros available starting at $1529 and up to $300 off MSRP. Apple’s one-year warranty is included, shipping is... Read more
New at T-Mobile: Switch to T-Mobile, and get...
T-Mobile is offering a free 64GB iPhone 8 for new customers who switch to T-Mobile and open a new line of service. Eligible trade-in required, and discount applied over a 24 month period. The fine... Read more
Xfinity Mobile’s Black Friday Apple savings:...
Take $250 off the purchase of any iPhone at Xfinity Mobile with a new line activation, and transfer of phone number to Xfinity Mobile, through December 8, 2019. This includes Apple’s new iPhone 11... Read more
2019 13″ 1.4GHz MacBook Pros available starti...
Apple has a full line of Certified Refurbished 2019 13″ 1.4GHz 4-Core Touch Bar MacBook Pros available starting at $1099 and up to $230 off MSRP. Apple’s one-year warranty is included, shipping is... Read more
Save up to $350 on a 21″ or 27″ iMac with the...
Apple has Certified Refurbished 2019 21″ & 27″ iMacs available starting at $929 and up to $350 off the cost of new models. Apple’s one-year warranty is standard, shipping is free, and each iMac... Read more
Early Holiday 2019 Sale: B&H again offers...
B&H Photo has 10.2″ iPads on sale again for $30 off Apple’s MSRP, starting at $299, as part of their early Holiday 2019 sale. Overnight shipping is free to many addresses in the US: – 10.2″ 32GB... Read more
Apple iMacs on sale today at B&H Photo fo...
B&H Photo has new 2019 21″ and 27″ 5K iMacs on stock today and on sale for up to $150 off Apple’s MSRP. Overnight shipping is free to many locations in the US. These are the same iMacs sold by... Read more
2018 4 and 6-Core Mac minis on sale today for...
Apple resellers are offering new 2018 4-Core and 6-Core Mac minis for $80-$100 off MSRP for a limited time. B&H Photo has the new 2018 4-Core and 6-Core Mac minis on sale for up to $100 off Apple... Read more
Early Holiday 2019 sale at B&H Photo: 12....
B&H Photo has new 12.9″ iPad Pros on sale for up to $120 off Apple’s MSRP as part of their early Holiday 2019 sale. Overnight shipping is free to many addresses in the US: – 12.9″ 64GB WiFi iPad... Read more
8-Core iMac Pro on sale today for $4499 at B...
B&H Photo has the base 8-Core 3.2GHz 32GB/1TB iMac Pro on sale today for $4499 — $500 off Apple’s MSRP. Shipping is free. Their price is the lowest available for a new iMac Pro from any Apple... Read more

Jobs Board

*Apple* Health Benefit Specialist - Call Cen...
Description ** Apple Health Benefit Specialist - Call Center (MAS 3/MACSC)** **Olympia, WA Multiple Positions** *The ideal candidate for this position will have Read more
Hair Stylist - *Apple* Blossom Mall - JCPen...
Hair Stylist - Apple Blossom Mall Location:Winchester, VA, United States- Apple Blossom Mall 1850 Apple Blossom Dr Job ID:1065040Salon Professionals Job Read more
*Apple* Mobility Pro - Best Buy (United Stat...
**747088BR** **Job Title:** Apple Mobility Pro **Job Category:** Store Associates **Store NUmber or Department:** 000297-Reston-Store **Job Description:** At Best Read more
Nurse Practitioner - Field Based (San Bernard...
Nurse Practitioner - Field Based (San Bernardino, CA, Apple Valley, Hesperia) **Location:** **United States** **Requisition #:** PS30312 **Post Date:** Nov 11, 2019 Read more
Best Buy *Apple* Computing Master - Best Bu...
**747061BR** **Job Title:** Best Buy Apple Computing Master **Job Category:** Store Associates **Store NUmber or Department:** 000647-Kildeer-Store **Job Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.