TweetFollow Us on Twitter

CMD-Shift-3
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
_GetNextEvent
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.

; MDEFINIT.ASM
; 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)
;_GETNEXTEVENT
;ADDA.W #18,SP
;_SYSTEMTASK
;

INCLUDE MACTRAPS.D

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

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

start:  
 BRA.W  after
patch:  
 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
@1:
 CLR.W  ROMmapInsert
jump: 
 JMP  $12345678  ;filled in by init routine

after:  
 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
 
newROM: 
 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
 RTS
 END
 

Community Search:
MacTech Search:

Software Updates via MacUpdate

MacUpdate Desktop 6.0.8 - Search and ins...
MacUpdate Desktop 6 brings seamless 1-click installs and version updates to your Mac. With a free MacUpdate account and MacUpdate Desktop 6, Mac users can now install almost any Mac app on macupdate.... Read more
BitTorrent Sync 2.1.1 - Sync files secur...
BitTorrent Sync allows you to sync unlimited files between your own devices, or share a folder with friends and family to automatically sync anything. File transfers are encrypted. Your information... Read more
Quicksilver 1.3.0 - Application launcher...
Quicksilver is a light, fast and free Mac application that gives you the power to control your Mac with keystrokes alone. Quicksilver allows you to find what you need quickly and easily, then act... Read more
iWatermark Pro 1.72 - Easily add waterma...
iWatermark Pro is the essential watermarking app for professional, business, and personal use. iWatermark, is the number 1 and only watermarking tool available for all 4 platforms iPhone/iPad, Mac,... Read more
RapidWeaver 6.3 - Create template-based...
RapidWeaver is a next-generation Web design application to help you easily create professional-looking Web sites in minutes. No knowledge of complex code is required, RapidWeaver will take care of... Read more
Adobe Photoshop CC 2015 16.0.1 - Profess...
Photoshop CC 2015 is available as part of Adobe Creative Cloud for as little as $19.99/month (or $9.99/month if you're a previous Photoshop customer). Photoshop CS6 is still available for purchase (... Read more
Together 3.4.6 - Store and organize all...
Together helps you organize your Mac, giving you the ability to store, edit and preview your files in a single clean, uncluttered interface. Smart storage. With simple drag-and-drop functionality,... Read more
Monosnap 3.1.0 - Versatile screenshot ut...
Monosnap lets you capture screenshots, share files, and record video and .gifs! Capture: Capture full screen, just part of the screen, or a selected window Make your crop area pixel perfect with... Read more
Cocktail 8.5.1 - General maintenance and...
Cocktail is a general purpose utility for OS X that lets you clean, repair and optimize your Mac. It is a powerful digital toolset that helps hundreds of thousands of Mac users around the world get... Read more
Vienna 3.0.6 :5eaf312: - RSS and Atom ne...
Vienna is a freeware and Open-Source RSS/Atom newsreader with article storage and management via a SQLite database, written in Objective-C and Cocoa, for the OS X operating system. It provides... Read more

Five Nights at Freddy's 4 has Been...
In keeping with tradition, Five Nights at Freddy's 4 has made its way to the App Store with zero warning fanfare. Honestly I'd be disappointed it if happened any other way at this point. [Read more] | Read more »
Doom & Destiny Advanced (Games)
Doom & Destiny Advanced 2.3.4.0 Device: iOS Universal Category: Games Price: $.99, Version: 2.3.4.0 (iTunes) Description: ---SUPER GIGA LAUNCH DISCOUNT! Get it now for cheap or pay more later!---An additional 143 MB download is... | Read more »
Five Nights at Freddys 4 (Games)
Five Nights at Freddys 4 1.0 Device: iOS Universal Category: Games Price: $2.99, Version: 1.0 (iTunes) Description: This time, the terror has followed you home. | Read more »
This Week at 148Apps: July 27-31, 2015
Winding Down July 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... | Read more »
You'll Want to Keep an Eye Out for...
If you're the kind of person who had fun hunting down and completing all the codex puzzles in Assassin's Creed 2, then are you ever in for a treat. The Guides looks like it's going to be a very robust collection of similarily odd, seemingly... | Read more »
Vivid Games has Announced Real Boxing 2...
The original Real Boxing was a pretty impressive bit of fisticuffs, but if the trailer Vivid Games is showing off for GamesCom is any indication Real Boxing 2 is going to be even better. [Read more] | Read more »
PAC-MAN Championship Edition DX - Tips,...
[Read more] | Read more »
Card King: Dragon Wars - Tips, Tricks an...
[Read more] | Read more »
Pac-Man Championship Edition DX has brou...
Bandai Namco has released Pac-Man Championship Edition DX on iOS and Android, which features the classic arcade gameplay that we've all grown to love. Pac-Man Championship Edition DX can be enjoyed in much shorter bursts than the arcade versions... | Read more »
Cosmonautica (Games)
Cosmonautica 1.1 Device: iOS Universal Category: Games Price: $6.99, Version: 1.1 (iTunes) Description: Cast off! Are you ready for some hilarious adventures in outer space? | Read more »

Price Scanner via MacPrices.net

MacBook 12 Retina Pundit’s New Favorite Mac
If you’re eyeing the purchase of a new 12-inch Retina MacBook, but wondering if you can live with a single USB-C port, 2011-level CPU performance, and the unorthodox keyboard, you should find... Read more
PDF Element Tool Kit For PDF For Windows 10,...
South Surrey, British Columbia based software developer Wondershare has posted an interesting infographic tracking the development of Microsoft’s flagship Windows operating system over the years,... Read more
27-inch 3.5GHz 5K iMac on sale for $81 off MS...
Adorama has the 27″ 3.5GHz 5K iMac on sale for $2218, $81 off MSRP, including a free copy of Apple’s 3-Year AppleCare Protection Plan. Shipping is free, and Adorama charges sales tax in NY & NJ... Read more
Back-to-School with Tablet and Smartphone Acc...
Belkin helps you prepare for the coming school year with a wide variety of the latest mobile and tablet accessories to outfit both grade school and college students. The line-up includes charging... Read more
11-inch MacBook Airs on sale for $100 off MSR...
Best Buy has 11-inch MacBook Airs on sale for $100 off MSRP. Choose free shipping or free local store pickup (if available). Sale prices for online orders only, in-store prices may vary: - 11″ 1.6GHz... Read more
iPad Air 2 on sale for up to $100 off MSRP
Best Buy has iPad Air 2s on sale for up to $100 off MSRP on their online store for a limited time. Choose free shipping or free local store pickup (if available). Sale prices available for online... Read more
Sale! 13-inch MacBook Pros on sale for $100 o...
B&H Photo has 13″ MacBook Pros on sale for $100 off MSRP. Shipping is free, and B&H charges NY sales tax only: - 13″ 2.5GHz/500GB MacBook Pro: $999.99 save $100 - 13″ 2.7GHz/128GB Retina... Read more
Sale! Save $100 on 13-inch MacBook Airs this...
B&H Photo has the 13″ 1.6GHz/128GB MacBook Air on sale for $899.99 including free shipping plus NY tax only. Their price is $100 off MSRP, and it’s the lowest price available for this model.... Read more
Worldwide Tablet Market Decline Continues, Ap...
The worldwide tablet market declined -7.0% year-over-year in the second quarter of 2015 (2Q15) with shipments totaling 44.7 million units according to preliminary data from the International Data... Read more
TP-LINK TL-PA8030P KIT Powerline Featuring Ho...
Consumer and business networking products provider TP-LINK is now shipping its TL-PA8030P KIT AV1200 3-Port Gigabit Passthrough Powerline Starter Kit that expands your home’s network over its... Read more

Jobs Board

*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
Infrastructure Engineer - *Apple* /Mac - Hil...
Infrastructure Engineer - Apple /Mac Job Code: 1608 # of openings: 1 Description Our fortune 500 client is looking to hire an experienced Infrastructure Engineer to join Read more
Executive Administrative Assistant, *Apple*...
…supporting presentation development for senior leadership. * User experience with Apple hardware and software is preferred. Additional Requirements The following list Read more
*Apple* Bus Company is now hirin - Apple Bus...
Apple Bus Company is now hiring school bus drivers in the Pettis County area. Class B CDL preferred. Free training provided. No nights or weekends required. Flexible Read more
*Apple* Certified Mac Technician - Updated 6...
…and friendly, hands-on technical support to customers troubleshooting and repairing Apple /Mac products with courtesy, speed and skill. Use your problem-solving skills Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.