TweetFollow Us on Twitter

October 90 - Apple II Q&A

APPLE II Q & A

Apple II Developer Technical Support

QHow can I force text-page-two shadowing on the Apple II GS?

A Most uses for text-page-two shadowing come from older, 8-bit applications that use text page two. On the Apple IIGS, a Monitor ROM routine at $F962 (TEXT2COPY) toggles shadowing of text page two, through hardware on ROM 3 and through software on older machines. (A heartbeat task copies the bank $00 screen to the bank $E1 screen for software shadowing.)

TEXT2COPY is only a toggle--it can't tell you the current state of shadowing. To see if shadowing is currently enabled (the user may have enabled it manually with the Alternate Display Mode desk accessory), try storing a character in the bank $00 text-page-two screen, waiting more than 1/60th of a second and seeing if the character has been copied to bank $E1.

QSome of the toolbox calls I make crash when executed with GSBug active, but behave normally when GSBug isn't present. How come?

A GSBug is intolerant of toolbox calls made in 8-bit mode. Although theApple IIGS Toolbox Reference (pages 1-2) clearly states that all toolbox calls must be made in full native mode, the current tool dispatcher protects you by beginning with a REP #$30 instruction. GSBug does not. Be sure to make all toolbox calls in full native mode.

QIf I try to select a file in an SFPutFile dialog box and the file already exists, clicking Save produces no action if I've entered ProDOS 8 since rebooting. Why?

A The System Software 5.0.2 Resource Manager does not restart correctly on return from ProDOS 8. It doesn't correctly add the system resource file into the search path. When Standard File detects that you're trying to save over an existing file, it calls ErrorWindow to display a dialog box with the warning, "That file already exists," and the choice to replace or cancel. ErrorWindow fails because the system resource file is not open and the AlertWindow template can't be loaded. Standard File treats an error in the ErrorWindow call as if you'd clicked Cancel in the "That file already exists" dialog box. The net effect is that nothing at all happens. This is corrected in System Software 5.0.3.

QWhy do Apple IIGS fonts look tall and skinny, as if they were made out of rubber and stretched too far in one direction? They look OK when I print using the "vertical condensed" option.

A Nearly all the Apple IIGS fonts were originally designed for other systems, usually the Macintosh. Font definitions for the Apple II GS and other systems are nearly identical. Macintosh pixels are square; the width-to-height ratio of a pixel is 1:1. Apple II GS pixels are much taller than they are wide (the ratio for Apple II GS 640 mode is about 5:12). When a font designed for square pixels is displayed on a system with pixels of a different shape, the characters look stretched. This is what happens on the Apple IIGS.

Apple could have changed the font strike for a more pleasing look at Apple IIGS resolutions, but for legal reasons such a change would require renaming the fonts. Times wouldn't be Times anymore, Helvetica wouldn't be Helvetica, and so on. The fonts would look the same, but the names would have to be different. In the tradeoff between appearance and well recognized font names, Apple chose to keep the familiar names and font strikes. To compensate for the stretched fonts, all of Apple's printer drivers include a "vertically condensed" printer option. Selecting this option causes the printer drivers to print with double the screen's vertical resolution. Doubling the vertical resolution effectively makes the pixel aspect ratio about 10:12, or 5:6, which is close enough to square that the fonts look the way we expect them to.

Some fonts are designed for the Apple II GS aspect ratio of 5:12. Such fonts are identified in their font family numbers by having the high bit set.


These questions and answers are compiled by the Apple II Developer Technical Support group. *

 

Community Search:
MacTech Search:

Software Updates via MacUpdate

Latest Forum Discussions

See All

Soft Drummer (Music)
Soft Drummer 1.0 Device: iOS Universal Category: Music Price: $14.99, Version: 1.0 (iTunes) Description: Soft Drummer is the closest thing to a pro session subtle drummer in your pocket. Easy to use and fast, it's much more than a... | Read more »
Is GO Gear the Pokemon GO map app you...
Now that we've settled into something of a Pokemon GO status quo, the number one desire of most players can best be summed out by modifying a quote from Rod Tidwell of Jerry Maguire: "Show me the Pokemon!" [Read more] | Read more »
Rodeo Stampede update: Mountains, new an...
The Savannah and Jungle were just the beginning in Rodeo Stampede. Get ready to head for the Mountains. I think I heard that in a beer ad once. [Read more] | Read more »
COSMOS RINGS (Games)
COSMOS RINGS 1.0.0 Device: iOS iPhone Category: Games Price: $5.99, Version: 1.0.0 (iTunes) Description: This game cannot be played without the Apple Watch.Released anniversary sale until August 31,2016 PST! A tragic tale of time's... | Read more »
How to get started selling on Mercari
As far as ecommerce has come over the last decade or so, there's still a tremendous opportunity to make it easier for people to buy and sell goods. That's especially true when it comes to shopping apps, which should only continue to increase in... | Read more »
Human Anatomy Atlas 2017 Edition - Compl...
Human Anatomy Atlas 2017 Edition - Complete 3D Human Body 1.0.24 Device: iOS iPhone Category: Medical Price: $24.99, Version: 1.0.24 (iTunes) Description: | Read more »
Heroes of Normandie (Games)
Heroes of Normandie 1.5 Device: iOS Universal Category: Games Price: $14.99, Version: 1.5 (iTunes) Description: The game does not support iPhone 4s and below | Read more »
Why you should never power up Pokemon in...
There's no question that candy is dandy in Pokemon GO. You need big quantities of it to evolve your Pokemon, and when combined with stardust, it can be used to power up your favorite pocket monsters as well, making them more formidable for the gym... | Read more »
Webzen launches 3D MMORPG MU Origin on i...
Mu Origin is featured time and time again at the very top of App Stores in China, and within the top five worldwide top-grossing charts on Google Play.Its popularity in Korea and China, featuring more than 120 registered players in China and 6... | Read more »
Severed (Games)
Severed 1.0 Device: iOS Universal Category: Games Price: $5.99, Version: 1.0 (iTunes) Description: LAUNCH DISCOUNT ON NOW!! ENDS AUGUST 4! ==== Take control of a one-armed warrior named Sasha, wielding a living sword on her journey... | Read more »

Price Scanner via MacPrices.net

9-inch 32GB Space Gray iPad Pro on sale for $...
B&H Photo has the 9″ 32GB WiFi Space Gray Apple iPad Pro on sale for $50 off MSRP including free shipping. B&H charges sales tax in NY only: - 9″ Space Gray 32GB WiFi iPad Pro: $549 $50 off... 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 $200 off MSRP. Shipping is free, and B&H charges NY tax only: - 15″ 2.2GHz Retina MacBook Pro: $1849 $150 off MSRP - 15″ 2.5GHz Retina... Read more
Second-Quarter Tablet Shipments Fell 4.8% –...
The latest report from the global market research firm TrendForce finds that worldwide tablet shipments for this second quarter totaled 33.54 million units, representing a quarterly drop of 4.8% and... Read more
Global Smartphone Sales Volumes Mark Second S...
According to preliminary results from the International Data Corporation (IDC) Worldwide Quarterly Mobile Phone Tracker, vendors shipped a total of 343.3 million smartphones worldwide in the second... Read more
Apple TVs on sale for $20-$40 off MSRP
Best Buy has 32GB and 64GB Apple TVs on sale for $20-$40 off MSRP on their online store. Choose free shipping or free local store pickup (if available). Sale prices for online orders only, in-store... Read more
Mac minis on sale for $50-$100 off MSRP
B&H Photo has Mac minis on sale for $50 off MSRP including free shipping plus NY sales tax only: - 1.4GHz Mac mini: $449 $50 off MSRP - 2.6GHz Mac mini: $649 $50 off MSRP - 2.8GHz Mac mini: $949... Read more
Clearance 2015 13-inch MacBook Airs available...
B&H Photo has clearance 2015 13″ MacBook Airs available for $300 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 certified refurbished iPad mini 4s avai...
Apple has certified refurbished iPad mini 4s now available for up to $120 off the cost of new models. An Apple one-year warranty is included with each iPad, and shipping is free. The following models... Read more
Notebook Makers In No Rush To Adopt USB-C – R...
Digitimes’ Cage Chao and Joseph Tsai note that while the USB Type-C interface is enjoying growing popularity among smartphones and tablet makers, notebook and all-in-one (AIO) PC vendors (other than... Read more
iMacs on sale for up to $250 off MSRP
B&H Photo has 21″ and 27″ Apple iMacs on sale for up to $250 off MSRP including free shipping plus NY sales tax only: - 27″ 3.3GHz iMac 5K: $2049 $250 off MSRP - 27″ 3.2GHz/1TB Fusion iMac 5K: $... Read more

Jobs Board

*Apple* Retail - Bilingual - Multiple Positi...
…speaking a plus Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the Read more
Simply Mac *Apple* Specialist- Repair Techn...
…The Technician is a master at working with our customers to diagnose and repair Apple devices in a manner that exceeds the expectations set forth by Apple Read more
*Apple* Mobile Master - Best Buy (United Sta...
What does a Best Buy Apple Mobile Master do? At Best Buy, our mission is to leverage the unique talents and passions of our employees to inspire, delight, and enrich Read more
Best Buy *Apple* Computing Master - Best Bu...
What does a Best Buy Apple Computing Master do? At Best Buy our mission is to leverage the unique talents and passions of our employees to inspire, delight, and Read more
*Apple* Valley, CA School Speech Therapy Ope...
Apple Valley, CA School Speech Therapy Openings + Job Location: Apple Valley, CA + Category: Schools - SLP - CFY + Apply Now! + Back to Results Speech Language Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.