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

BetterTouchTool 2.292 - Customize Multi-...
BetterTouchTool adds many new, fully customizable gestures to the Magic Mouse, Multi-Touch MacBook trackpad, and Magic Trackpad. These gestures are customizable: Magic Mouse: Pinch in / out (zoom... Read more
Bookends 12.8.3 - Reference management a...
Bookends is a full-featured bibliography/reference and information-management system for students and professionals. Bookends uses the cloud to sync reference libraries on all the Macs you use.... Read more
Mellel 3.5.5 - The word processor for sc...
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
Mellel 3.5.5 - The word processor for sc...
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
Bookends 12.8.3 - Reference management a...
Bookends is a full-featured bibliography/reference and information-management system for students and professionals. Bookends uses the cloud to sync reference libraries on all the Macs you use.... Read more
Carbon Copy Cloner 4.1.18 - Easy-to-use...
Carbon Copy Cloner backups are better than ordinary backups. Suppose the unthinkable happens while you're under deadline to finish a project: your Mac is unresponsive and all you hear is an ominous,... Read more
Hopper Disassembler 4.2.14- - Binary dis...
Hopper Disassembler is a binary disassembler, decompiler, and debugger for 32- and 64-bit executables. It will let you disassemble any binary you want, and provide you all the information about its... Read more
BetterTouchTool 2.291 - Customize Multi-...
BetterTouchTool adds many new, fully customizable gestures to the Magic Mouse, Multi-Touch MacBook trackpad, and Magic Trackpad. These gestures are customizable: Magic Mouse: Pinch in / out (zoom... Read more
Sound Studio 4.8.11 - Robust audio recor...
Sound Studio lets you easily record and professionally edit audio on your Mac. Easily rip vinyls and digitize cassette tapes, or record lectures and voice memos. Prepare for live shows with live... Read more
Sound Studio 4.8.11 - Robust audio recor...
Sound Studio lets you easily record and professionally edit audio on your Mac. Easily rip vinyls and digitize cassette tapes, or record lectures and voice memos. Prepare for live shows with live... Read more

The best 2v2 card combos in Clash Royale
2v2 is making it's grand return toClash Royalequite soon. 2v2 has quickly become one of the game's most popular gameplay modes, though they still have yet to make it a permanent fixture in the game. 2v2 is exciting and adds some new flavor to... | Read more »
The best games we played this week - Aug...
Another busy week has come to a close. We played a lot of excellent games this week and now it's time to look back and reflect on some our favorites. Here are our picks for the week of August 18. [Read more] | Read more »
War Wings beginner's guide - how to...
War Wings is the newest project from well-established game maker Miniclip. It's a World War II aerial dogfighting game with loads of different airplane models to unlock and battle. The game offers plenty of single player and multiplayer action. We... | Read more »
How to win every 2v2 battle in Clash Roy...
2v2 is coming back to Clash Royale in a big way. Although it's only been available for temporary periods of time, 2v2 has seen a hugely positive fan response, with players clamoring for more team-based gameplay. Soon we'll get yet another taste of... | Read more »
Roll to Win with Game of Dice’s new upda...
Joycity’s hit Game of Dice gets a big new update this week, introducing new maps, mechanics, and even costumes. The update sets players loose on an exciting new map, The Cursed Tower, that allows folks to use special Runes mid-match. If you feel... | Read more »
Bottom of the 9th (Games)
Bottom of the 9th 1.0.1 Device: iOS iPhone Category: Games Price: $4.99, Version: 1.0.1 (iTunes) Description: Play the most exciting moment of baseball in this fast-paced dice and card game! | Read more »
The best apps for viewing the solar ecli...
If you somehow missed the news, many parts of the United States will be witness to a total solar eclipse on August 21 for the first time in over 90 years. It'll be possible to see the eclipse in at least some capacity throughout the continental U... | Read more »
The 5 best mobile survival games
Games like ARK: Survival Evolved and Conan Exiles have taken the world of gaming by storm. The market is now flooded with hardcore survival games that send players off into the game's world with nothing but maybe the clothes on their back. Never... | Read more »
Portal Walk (Games)
Portal Walk 1.0 Device: iOS Universal Category: Games Price: $1.99, Version: 1.0 (iTunes) Description: Portal Walk is adventure and relaxing platform game about Eugene. Eugene stuck between worlds and trying to find way back home.... | Read more »
Technobabylon (Games)
Technobabylon 1.0 Device: iOS Universal Category: Games Price: $4.99, Version: 1.0 (iTunes) Description: City of Newton, 2087. Genetic engineering is the norm, the addictive Trance has replaced almost any need for human interaction,... | Read more »

Price Scanner via MacPrices.net

Apple’s 2017 Back to School Promotion: Free B...
Purchase a new Mac using Apple’s Education discount, and take up to $300 off MSRP. All teachers, students, and staff of any educational institution qualify for the discount. Shipping is free. As part... Read more
Clearance 2016 12-inch Retina MacBooks, Apple...
Apple has Certified Refurbished 2016 12″ Retina MacBooks available starting at $1019. Apple will include a standard one-year warranty with each MacBook, and shipping is free. The following... Read more
15-inch 2.2GHz Retina MacBook Pro, Apple refu...
Apple has Certified Refurbished 2015 15″ 2.2GHz Retina MacBook Pros available for $1699. That’s $300 off MSRP, and it’s the lowest price available for a 15″ MacBook Pro. An Apple one-year warranty is... Read more
Apple refurbished Mac minis available startin...
Apple has Certified Refurbished Mac minis available starting at $419. Apple’s one-year warranty is included with each mini, and shipping is free: – 1.4GHz Mac mini: $419 $80 off MSRP – 2.6GHz Mac... Read more
Apple refurbished iPad Pros available startin...
Apple has Certified Refurbished 2016 12″ WiFi iPad Pros available starting at $589. An Apple one-year warranty is included with each model, and shipping is free: – 32GB 12″ iPad Pro WiFi: $589... Read more
Weekend sale: 13-inch MacBook Pros for up to...
Amazon has new 2017 13″ MacBook Pros on sale today for up to $200 off MSRP, each including free shipping: – 13″ 3.1GHz/256GB Space Gray MacBook Pro (MPXV2LL/A): $1599.99 $200 off MSRP – 13″ 3.1GHz/... Read more
Back To School With The Edge Desk All-in-one...
Back to school is just around the corner, and the ergonomically correct Edge Desk all-in-one portable kneeling desk is ideal for students living in dorms and small apartments, Edge Desk features:... Read more
Norton Core Secure Wi-Fi Router Now Available...
First introduced at the 2017 Consumer Electronics Show (CES), Norton Core, a secure, high-performance Wi-Fi router, fundamentally changed the concept of Wi-Fi routers by making security the primary... Read more
ViewSonic Adds New 27-inch 4K UHD Monitor to...
ViewSonic Corp. has introduced the VP2785-4K, a 27-inch 4K UHD (3840×2160) monitor that delivers precise and consistent color representation and performance to ensure incredible image quality. Built... Read more
Apple now offering Certified Refurbished 2017...
Apple is now offering Certified Refurbished 2017 27″ iMacs for up to $350 off original MSRP. Apple’s one-year warranty is standard, and shipping is free. The following models are available: – 27″ 3.... Read more

Jobs Board

Development Operations and Site Reliability E...
Development Operations and Site Reliability Engineer, Apple Payment Gateway Job Number: 57572631 Santa Clara Valley, California, United States Posted: Jul. 27, 2017 Read more
Frameworks Engineering Manager, *Apple* Wat...
Frameworks Engineering Manager, Apple Watch Job Number: 41632321 Santa Clara Valley, California, United States Posted: Jun. 15, 2017 Weekly Hours: 40.00 Job Summary Read more
*Apple* Solutions Consultant - Apple Inc. (U...
…about helping others on a team while also delighting customers? As an Apple Solutions Consultant (ASC), you will discover customers needs and help connect them Read more
*Apple* Solutions Consultant - Apple Inc. (U...
Job Summary As an Apple Solutions Consultant, you'll be the link between our future customers and our products. You'll showcase your entrepreneurial spirit as you Read more
*Apple* Solutions Consultant (ASC) - Stockho...
Job Summary The ASC is an Apple employee who serves as the Apple business manager and influencer in a Reseller's store. The ASC's role is to grow Apple Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.