TweetFollow Us on Twitter

Volume Number:2
Issue Number:8
Column Tag:Assembly Language Lab

CMD-Shift-3 Patch for the New ROMS

By Harvey Grosser, Oakland, CA

Menu Snapshots with the new ROMs

As was described in the July MacTutor, attempting to take a screen dump with a menu pullled down on a machine with the 128K ROM results in the menu snapping up before the dump is taken. Also, on both old and new ROMs, pulling down a menu results in the Alarm clock (and any other desk accessories which require periodic updates) freezing, because no call is made to SystemTask by the Menu Manager. This short patch fixes both of these problems.

First, we need to patch the menu definition 0 resource in the system file. To do that, start up ResEdit and open the system file. Select MDEF 0 resource. Double-click on it and insert the following code at the beginning of the resource:

9EFC 0012 3F3C 0008
486F 0004 A970 DEFC
0012 A9B4

You may want to set the system heap flag as well to improve performance. This will cause it to be loaded once by the Finder and then remain on the system heap for subsequent applications.

Fig. 1 It Works Again on a Mac Plus!

Now close and save the system file. Assemble and link the INIT resource at the end of this article, and paste it into your system file. (Note: Make sure that the ID of this INIT, (17), does not duplicate that of an existing one-change if if necessary.) When you run an application, you will find that pressing Command-Shift-3 with a menu pulled down results in a screen dump being taken immediately, without waiting for the mouse to be released. This permits multiple snapshots to be taken from the same menu without having to pull it down each time, a boon when documenting a long menu. Also, desk accessories will no longer freeze when a menu is down, although they will still freeze when the cursor is in an unused part of the menu bar.

How it Works

This is the source code for this patch above:

SUBA.W  #18,SP ;stack space for evt record, result
MOVE.W  #8,-(SP) ;keydown event mask
PEA4(SP);address of evt record VAR param
ADDA.W  #18,SP ;discard function result & event rec
_SystemTask ;allow DAs to work

Since the menu definition function is executed repeatedly while a menu is pulled down, this results in calls to GetNextEvent with an event mask which permits it to take key down events from the system event queue. When it sees one of these, it executes the appropriate FKEY routine if a Command-Shift-number key combination was pressed. The call to SystemTask permits desk accessories to run. The INIT routine is necessary because the new resource manager uses the MDEF 0 in ROM rather than the one in the System File. (See the Aug. '85 issue of MacTutor for info on the INIT resources.) The patch functions by setting ROMmapInsert to 0 before every call to GetResource when the type asked for is MDEF or FONT. (This permits editing the Chicago font, some characters of which I consider really bad.) It is necessary to patch GetResource directly like this because the Menu Manager always sets ROMmapInsert to TRUE before making the call. I would really appreciate it if someone out there could give the exact meaning of the individual bytes at $B9E (ROMmapInsert) and $B9F (TempResLoad); Apple's Tech Note #57 is rather vague on this.

; place this INIT in system file
; to fix cmd-shift-3 bug

;Place this patch in MDEF 0
;resource (at beginning), in
;your system file:
;9EFC 0012 3F3C 0008
;486F 0004 A970 DEFC
;0012 A9B4
;Patch meaning:
;SUBA.W #18,SP
;MOVE.W #8, -(SP)
;PEA  4(SP)
;ADDA.W #18,SP


GetResource equ  $A9A0  ;trap address
ROM85   equ $28E ;new ROM= $7FFF 
RomMapInsert   equ   $B9E 

RESOURCE'INIT' 17'MDEF Init' $50 ;SysHeap+locked

 BRA.W  after
 CMPI.L #'MDEF', 6(SP)  ;check type
 BEQ.S  @1;for MDEF or FONT;
 CMPI.L #'FONT', 6(SP)  ;if not,
 BNE.S  jump;don't change map
 CLR.W  ROMmapInsert
 JMP  $12345678  ;filled in by init routine

 LEA  start,A0 
 _RecoverHandle  ;handle to proc
 TST.W  ROM85  ;new roms? (7FFF)
 BPL.S  newROM ;yes, go for it
 _DisposHandle   ;no, forget it
 RTS    ;and exit
 MOVE.L #after-start,D0 ;get our size
 _SetHandleSize  ;chop off init routine
 MOVE.W #GetResource,D0 
 _GetTrapAddress ;addr of GetResource
 LEA  jump+2,A1  ;paste it into patch
 MOVE.L A0, (A1) ;patch it
 LEA  patch, A0  
 MOVE.W #GetResource,D0 
 _SetTrapAddress ;install patch

Community Search:
MacTech Search:

Software Updates via MacUpdate

Tidy Up (Five Users) 4.1.5 - Find duplic...
Tidy Up is a complete duplicate finder and disk-tidiness utility. With Tidy Up you can search for duplicate files and packages by the owner application, content, type, creator, extension, time... Read more
Mellel 3.4.3 - The word processor of cho...
Mellel is the leading word processor for OS X and has been widely considered the industry standard since its inception. Mellel focuses on writers and scholars for technical writing and multilingual... Read more
Skype - Voice-over-internet p...
Skype allows you to talk to friends, family and co-workers across the Internet without the inconvenience of long distance telephone charges. Using peer-to-peer data transmission technology, Skype... Read more
Bookends 12.6.0 - Reference management a...
Bookends is a full-featured bibliography/reference and information-management system for students and professionals. Access the power of Bookends directly from Mellel, Nisus Writer Pro, or MS Word (... Read more
Apple iBooks Author 2.4 - Create and pub...
Apple iBooks Author helps you create and publish amazing Multi-Touch books for iPad. Now anyone can create stunning iBooks textbooks, cookbooks, history books, picture books, and more for iPad. All... Read more
Web Snapper 3.3.9 - Capture entire Web p...
Web Snapper lets you capture Web pages exactly as they appear in your browser. You can send them to a file as images or vector-based, multi-page PDFs. It captures the whole Web page - eliminating the... Read more
Tunnelblick 3.6beta10 - GUI for OpenVPN...
Tunnelblick is a free, open source graphic user interface for OpenVPN on OS X. It provides easy control of OpenVPN client and/or server connections. It comes as a ready-to-use application with all... Read more
EtreCheck 2.5.1 - For troubleshooting yo...
EtreCheck is a simple little app to display the important details of your system configuration and allow you to copy that information to the Clipboard. It is meant to be used with Apple Support... Read more
Paragraphs 1.0.4 - Writing tool just for...
Paragraphs is an app just for writers. It was built for one thing and one thing only: writing. It gives you everything you need to create brilliant prose and does away with the rest. Everything in... Read more
Things 2.8 - Elegant personal task manag...
Things is a task management solution that helps to organize your tasks in an elegant and intuitive way. Things combines powerful features with simplicity through the use of tags and its intelligent... Read more

Camel Up (Games)
Camel Up 1.0.0 Device: iOS Universal Category: Games Price: $4.99, Version: 1.0.0 (iTunes) Description: | Read more »
The Martian: Bring Him Home (Games)
The Martian: Bring Him Home 1.0 Device: iOS Universal Category: Games Price: $2.99, Version: 1.0 (iTunes) Description: Based on the best selling novel and critically acclaimed film, THE MARTIAN tells the story of Astronaut Mark... | Read more »
This Week at 148Apps: September 21-30, 2...
Leap Into Fall With 148Apps How do you know what apps are worth your time and money? Just look to the review team at 148Apps. We sort through the chaos and find the apps you're looking for. The ones we love become Editor’s Choice, standing out above... | Read more »
Tweetbot 4 for Twitter (Social Networki...
Tweetbot 4 for Twitter 4.0 Device: iOS Universal Category: Social Networking Price: $4.99, Version: 4.0 (iTunes) Description: *** 50% off for a limited time. *** | Read more »
Mori (Games)
Mori 1.0 Device: iOS Universal Category: Games Price: $2.99, Version: 1.0 (iTunes) Description: Stop, rewind and unwind with Mori. Time is always running, take a moment to take control. Mori is an action puzzle game about infinitely... | Read more »
100 Years' War (Games)
100 Years' War 1.0 Device: iOS Universal Category: Games Price: $3.99, Version: 1.0 (iTunes) Description: | Read more »
Tower in the Sky (Games)
Tower in the Sky 0.0.60 Device: iOS Universal Category: Games Price: $1.99, Version: 0.0.60 (iTunes) Description: | Read more »
hocus. (Games)
hocus. 1.0.0 Device: iOS Universal Category: Games Price: $.99, Version: 1.0.0 (iTunes) Description: New, polished, mind-bending, minimal puzzle game with dozens of levels and extra-ordinary design Features:- Beautifully crafted... | Read more »
Mos Speedrun 2 (Games)
Mos Speedrun 2 1.0 Device: iOS Universal Category: Games Price: $1.99, Version: 1.0 (iTunes) Description: Mos is back, in her biggest and most exciting adventure ever! Wall-jump to victory through 30 mysterious, action packed levels... | Read more »
3D Touch could be a game-changer, but it...
Were you one of the lucky/financially secure enough ones to buy a new iPhone 6s or iPhone 6s Plus over the weekend? Yup, me too (I’m not convinced I was either of those two things, but let’s go with lucky for now), so I thought I’d delve into just... | Read more »

Price Scanner via

Apple refurbished iPad Air 2s available for u...
Apple has Certified Refurbished iPad Air 2s available for up to $140 off the price of new models. Apple’s one-year warranty is included with each model, and shipping is free: - 128GB Wi-Fi iPad Air 2... Read more
Save up to $100 on Mac AppleCare Protection P...
Adorama has 3-Year AppleCare Warranties on sale for up to $100 off MSRP including free shipping plus NY & NJ sales tax only: - Mac Laptops 15″ and Above: $249 $100 off MSRP - Mac Laptops 13″ and... Read more
Updated Mac Price Trackers
We’ve updated our Mac Price Trackers with the latest information on prices, bundles, and availability on systems from Apple’s authorized internet/catalog resellers: - 15″ MacBook Pros - 13″ MacBook... Read more
12-inch MacBooks in stock for up to $120 off,...
Adorama has 12″ Retina MacBooks in stock for up to $120 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 Adapter,... Read more
15-inch 2.2GHz Retina MacBook Pro on sale for... has the 15″ 2.2GHz Retina MacBook Pro on sale for $1799 including free shipping. Their price is $200 off MSRP, and it’s the lowest price available for this model (except for Apple’s $1699... Read more
iPhone 6s and 6s Plus Feature Improved Durabi...
Upgraded components in the new iPhone 6s Plus cost $16 more than the components in the earlier iPhone 6 Plus according to a preliminary estimate from IHS Inc. The bill of materials (BOM) for an... Read more
13-inch Retina MacBook Pros on sale for up to...
Adorama has 13″ Retina MacBook Pros on sale for up to $130 off MSRP. Shipping is free, and Adorama charges sales tax for NY & NJ residents only: - 13″ 2.7GHz/128GB Retina MacBook Pro: $1199.99 $... Read more
Apple refurbished 2014 13-inch Retina MacBook...
Apple has Certified Refurbished 2014 13″ 2.6GHz/128GB SSD Retina MacBook Pros available $979, $320 off original MSRP. An Apple one-year warranty is included, and shipping is free: - 13″ 2.6GHz/128GB... Read more
iOS 9 Reflections Ten Days In – The ‘Book Mys...
I’ve never been much of an early adopter by philosophy or temperament, although I did buy the iPad Air 2 I’m typing this column on last fall only about a month after Apple unveiled it. However, my... Read more
Apple refurbished Time Capsules available for...
Apple has certified refurbished Time Capsules available for $120 off MSRP. Apple’s one-year warranty is included with each Time Capsule, and shipping is free: - 2TB Time Capsule: $179, $120 off - 3TB... Read more

Jobs Board

Senior Payments Security Manager - *Apple*...
**Job Summary** Apple , Inc. is looking for a highly motivated, innovative and hands-on senior payments security manager to join the Apple Pay security team. You will Read more
*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* Site Security Manager - Apple (Unite...
**Job Summary** The Site Security Manager is a high-profile security position at Apple . The Site Manager is the face of Apple Global Security (GS) and primary point Read more
*Apple* Fulfillment Operations Execution Ana...
**Job Summary** The AMR Apple Fulfillment Operations Team is seeking a talented team player to drive the Apple Online Store (AOS) fulfillment performance to ensure a Read more
*Apple* Distinguished Educator (ADE) Communi...
**Job Summary** Apple is seeking candidates for a new position on the Apple Distinguished Educator (ADE) Program team as ADE Community Support Manager. Join a team Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.