TweetFollow Us on Twitter

Apr 86 Letters
Volume Number:2
Issue Number:4
Column Tag:Letters

Letters

Stolen From a Mac?

Erik Westra

Wellington, New Zealand

Your magazine is absolutely fantastic. I find that I can use something from every artical, even though I work mostly in assembler. I hope that the "Electrical Mac" column continues; it's got just the type of info that you can't normally get hold of.

Here's something you might be interested in. While I was poking about in the Mac's ROM, I took a look at the bit of code Steve Jasik mentioned on page 48 of your May 1985 issue. Steve said that the code blasts 32 long words into RAM and then hangs. This is the code he was talking about (on a 512K Mac):

40AD30: LEA $40AD40,A0
 MOVEQ  #$18,D1
40AD36: MOVE.L (40)+,(A1)
 ADDA.W D0,A1
 DBRA D1,$40AD36
 BRA  *-02

Looking at this, I thought that this might be the code that displays the "sad Macintosh" icon on the screen if the system bombs while booting. I displayed the 32 long words at $40AD40 as an icon using a program I'd writen in Kriya's NEON language, and look what I found (displayed at twice it's size):

Maybe the code is called by the RAM based operating system if it finds it's using funny hardware (eg, in a Mac lookalike).

[Our Forth editor, Jörg Langowski, recently paid us a visit here in Placentia while visiting from France, and I showed him Mr. Westra's letter. He was most intrigued and promtly wrote this little stolen icon finder program in Mach 1, the subject of his Threaded Code column this month. The icon is shown at twice it's normal size by this program. Note that the location of this code is different in the new ROMS! A sincere thank you Erik, for sharing this with your US friends. To my knowledge, this has never been revealed! -Ed.]

( demo to get the stolen Apple icon out of the ROM )
( c ) ( J. Langowski 1986 for MacTutor )
( start address of the icon is at $40E132, on a Mac Plus)
( and at $40AD40 on a 512K Mac, found with NOSY 2.0)

hex
variable icon   variable icnrect 4 vallot
40e132 icon !
00800080 icnrect ! 00c000c0 icnrect 4 + ! ( use double size )

: stolen icnrect icon call ploticon ; 
   ( don't know why to use pointer instead of handle for ICON )

Feature Articles?

Paul Devey

Ottawa, Ontario

Mactutor is the best Journal I have seen anywhere for any price. I have waited for years for a journal of your calibur. Please sign me up for a one year subscription as well as all of the back issues. How about sometimes having a feature section or feature issues on different topics such as graphics, sound, I/O etc. Keep up the great work. The only place you should be able to find PHLUFF is between your toes. [This month we feature desk accessories! -Ed.]

Abstract Wanted

William T. Cox

Madison, Wi.

Have you considered offering a subscription to source disks? I have no idea what your demand is, but ( based on the last year) I believe that many people would be intersted. Have you considered offering an index/abstract list for volume 1? A Microsoft File data disk would be a useful offering. A brief abstract or keyord list could be included with each article record. Thanks for a fine magazine! [Maybe the folks at MacBriefs would make us one. -Ed]

Likes Fortran

John Fineout

Duncanville, Tx

Enclosed is my payment for 1986 MacTutor subscription. I depend on your publication heavily to learn insights into programing the Macintosh. I am using Mac Fortran 2.1 forom Microsoft and Macintosh Pascal. I have missed the articles on Fortran in the alast few issues. I have ported several progams from an DEC VAX 11/750 over to the Macintosh with very little problem. I am interested to learn more on how to create a Macintosh environment for input and output for such routines. Other unknowns are how to make use of the keypad and detect tab and enter as a line terminator.

The following Mac Fortran program can be used in substitution for the VAX Fortran time and date system call. It can be made into a subroutine that returns the 23 character time and date sring similar to the VAX. [Note: code below is re-typed from a letter, not pasted from source code as we normally do, so beware. -Ed.]

 Program Time_Date
 Character Months(12)*3,APM*3,datetime*23
 Integer Seconds,MM,DD,YY,L,M
 Real Hours
 Data Months/'JAN','FEB','MAR','APR','MAY','JUN', 
2      'JUL','AUG', 'SEP',''OCT','NOV','DEC'/
 Call Time(Seconds)
 Hours = Seconds/86400.0*24.0
 L = AINT(Hours)
 Mins = (Hours - L)* 60.0
 if (L .gt. 12) then
 APM = ' pm'  
 L = L - 12
 Else
 APM = ' am'
 End if
 Call Date(MM,DD,YY)

 Write(datetime,fmt='I2,A,I2.2,A3,
2     a6,I2,a,A3,a,I2')  L,char(58),Mins,APM,
2     ' Date ',DD,char(45), Months(MM),char(45),YY
 Write (9,100)datetime
100Format ('Time is now ',a23)
 pause
 stop
 end

Maybe this will be helpful to someone. Please deep the Fortran articles coming. [What would be the most help is to convince Microsoft to support and upgrade Fortran to run under HFS on the Mac Plus before 1988, and to make their linker more MDS compatible and bug free. A decent Mac interface would be nice also. And don't forget to mention finishing the parameter glue file support and documentation! -Ed.]

Notes on Basic

Gary Voth

Ontario, Ca

I want to say that I enjy Dave Kelly's fine columns on BASIC programming. BASIC is a favorite language of mine, despite its limitations. I love the interactive pampering that only an interpreted language can give.

However, I spotted an error or two in the January article on using scroll bars from BASIC. I'd like to share the corrections with your readers.

On page 25 the author notes a problem using the BASIC function DEFINT a-z with library calls. To prevent errors from occurring when library routines care called, he recommends defining integer arguments individually (by using the % sign) instead of using the DEFINT statement. Actually, this does prevent the errors, but only by accident!

The reason that calling a bibrary routine creates an error after a DEFINT statement has to do with the way the routines are accessed by BASIC. When a programmer invokes a library routine, such a

CALL  DisposeScroll(ScrID%)

BASIC actually creates a data structure in memory that contains the routine's object code and (in our example) assigns the starting address the variable name "DisposeScroll." Since BASIC's interger data type is 16 bits long, and Macintosh memory locations require at least 24 bits to represent, an error is generated if the variable "DisposeScroll" is defined as an interger (as would be the case after a DEFINT statement)!

It is easy to work around this limitation, however, by designating our llibrary routine names as single-precision (32 bit) variables using the ! sign. This is done in the form below:

            DEFINT a-z
            Call DisposeScroll!(scrID)

Alternatively, you can use the form:

          DEFINT a-z
             DisposeScroll! ScrID

Note that this is essentially the same thing as calling an assembly language routine that has been appended to BASIC the old fashioned way-by POKE-ing it into an array. The array's starting address, as returned by the VARPTR function, can never be forced into an integer:

          DEFINT a-z
             ...
             DisposeScroll!=VARPTR(AsmArray(0)
          CALL DisposeScroll!(ScrID) 

One more note: In the question and answer section the author discusses ways to clear parts of the screen individually without using the CLS function. (By "screen" we of course mean window.) One simple way of doing this that wasn't mentioned is to "paint" with white. Use the Quickdraw call FILLRECT or the BASIC LINE statement to draw a rectangle of white pixels over the section of the window that neds to be erased. For example:

Black% = 33
White% =30
...
LINE(50,50)-(100,100),White%,bf

will erase a section of the current output window 50 pixels square. Of course, the current penmode shold be the default COPY mode. If it has been changed the programmer should restore it with a CALL PENMODE(8) statement.

HFS and Dollars & $ense

Terry A. Ward

Cedar Falls, La

I read with interest the status of commecial software with the HFS file system (vol.2 #1). I noticed that Dollars & $ense is noted as bombing with an insufficient memory message. A quick fix that has worked for me is to reduce the number of desk accessories in the system. By reducing the size of desk accessories from 22,730 bytes to 12,926 I am able to use the product with no problems.

Keep up the great work with MacTutor!

The Max Board!

Mike Carlton

Berkeley, Ca

In the Dec. 1985 issue you have included one of my posts on the MouseHole, concerning the MacMemory board. I would like to make a few corrections now that some new information has come to light. I spoke to some of the MacMemory people at the MacWorld conventionin San Francisco and the told me that the TheMax is NOT compatible with the new ROMs from apple. However, they want to be fair to their customers so they are offering an upgrade, at their cost, to TheMax2. This new board comes; with 2 meg. of RAM and sockets for expansion to 4 meg! All you ned to do is plug in 16 1 meg. chips and you have a 4 meg. Mac. The new board is compatible with the new ROMs; however, if you use the new ROMs, you lose the non-volitable RAM disk.

Anyone with TheMax should contact their dealer. MacMemory is selling the boards to the dealers at cost and asking the dealers to do the upgrade (just a board swap) at no profit. They said prices shold be around $150, but this wasn't finalized.

Friend of MacTutor

Doyle B. Myers

Seattle, Wa

I heard about your "setback" - the loss of your equipment and records from Steve Brecher, my Compu Serve buddy. He suggested that subscribing to MacTutor would be a nice way to help out, and you've got such an impressive reputation with all my fellow developers that I have no problems at all with that. Good luck and keep up the good work! [Thank you very much and to all of our friends and supporters who have expressed their appreciation for our continued publication. -Ed.]

Renewal to ease the pain

Rod Paine

Purcellville, Va

Sorry to learn of your robbery at MacTutor, I hope you're able to put things back together without too much of a loss being sustained.

I know that every little bit can help right now, so I've enclosed a subscription renewal... I think mine is up about August, but in any ccase please add this onto it.

While we only met briefly at the Boston Mac Expo and we'd never be able to pick each other out in a crowd, what you are poviding the readers of MacTutor does maake you stand out... and I'm pleased to be a part of the readership and what MacTutor stands for. [Spoken like a true old-timer! Thanks very much. -Ed.]

Share your technical thoughts on Mac snooping and programming. Write to MacTutor today!

 

Community Search:
MacTech Search:

Software Updates via MacUpdate

DiskCatalogMaker 6.4.12 - Catalog your d...
DiskCatalogMaker is a simple disk management tool which catalogs disks. Simple, light-weight, and fast. Finder-like intuitive look and feel. Super-fast search algorithm. Can compress catalog data... Read more
Macs Fan Control 1.3.0.0 - Monitor and c...
Macs Fan Control allows you to monitor and control almost any aspect of your computer's fans, with support for controlling fan speed, temperature sensors pane, menu-bar icon, and autostart with... Read more
Lyn 1.5.11 - Lightweight image browser a...
Lyn is a lightweight and fast image browser and viewer designed for photographers, graphic artists and Web designers. Featuring an extremely versatile and aesthetically pleasing interface, it... Read more
NeoOffice 2014.11 - Mac-tailored, OpenOf...
NeoOffice is a complete office suite for OS X. With NeoOffice, users can view, edit, and save OpenOffice documents, PDF files, and most Microsoft Word, Excel, and PowerPoint documents. NeoOffice 3.x... Read more
LaunchBar 6.4 - Powerful file/URL/email...
LaunchBar is an award-winning productivity utility that offers an amazingly intuitive and efficient way to search and access any kind of information stored on your computer or on the Web. It provides... Read more
Remotix 3.1.4 - Access all your computer...
Remotix is a fast and powerful application to easily access multiple Macs (and PCs) from your own Mac. Features Complete Apple Screen Sharing support - including Mac OS X login, clipboard... Read more
DesktopLyrics 2.6.6 - Displays current i...
DesktopLyrics is an application that displays the lyrics of the song currently playing in "iTunes" right on your desktop. The lyrics for the song have to be set in iTunes; DesktopLyrics does nothing... Read more
VOX 2.5.1 - Music player that supports m...
VOX is a beautiful music player that supports many filetypes. The beauty is in its simplicity, yet behind the minimal exterior lies a powerful music player with a ton of features and support for all... Read more
NetNewsWire 4.0.0 - RSS and Atom news re...
NetNewsWire is the best way to keep up with the sites and authors you read most regularly. Let NetNewsWire pull down the latest articles, and read them in a distraction-free and Mac-like way. Native... Read more
MacUpdate Desktop 6.0.6 - 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

Biz Builder Delux (Games)
Biz Builder Delux 1.0.0 Device: iOS Universal Category: Games Price: $4.99, Version: 1.0.0 (iTunes) Description: Ah, there's nothing like the rhythmic bustle of a burgeoning business burg... especially when you're the one building it... | Read more »
Auroch Digital is Bringing Back Games Wo...
| Read more »
Carbo - Handwriting in the Digital Age...
Carbo - Handwriting in the Digital Age 1.0 Device: iOS Universal Category: Productivity Price: $3.99, Version: 1.0 (iTunes) Description: | Read more »
Draggy Dead (Games)
Draggy Dead 1.1 Device: iOS Universal Category: Games Price: $.99, Version: 1.1 (iTunes) Description: Ditch your dead end job and take up a rewarding career in Grave Robbing today!Guide the recently deceased to a fun filled life of... | Read more »
Bad Dinos (Games)
Bad Dinos 1.0.0 Device: iOS Universal Category: Games Price: $2.99, Version: 1.0.0 (iTunes) Description: | Read more »
The Apple Watch isn't Great as a Fi...
| Read more »
Show the World What You See With Stre.am...
Live broadcasting is getting popular on mobile devices, which is why you can now get Stre.am, by Infinite Takes. [Read more] | Read more »
PhotoTime's 2.1 Update Adds Apple W...
The latest PhotoTime update is adding even more functionality to the handy photo organizing app. Yep, including Apple Watch support. [Read more] | Read more »
Oh My Glob! Adventure Time Puzzle Quest...
Finn and Jake are taking over D3 Go!'s popular puzzle game series in the upcoming Adventure Time Puzzle Quest. [Read more] | Read more »
Earthcore: Shattered Elements - Tips, Tr...
At first glance, Earthcore: Shattered Elements seems like a rather simple card-battling game. Once you’re introduced to skills that will change quite a bit. Even more so once you start to acquire hero cards. But it’s not so complicated that we... | Read more »

Price Scanner via MacPrices.net

OtterBox Maximizes Portability, Productivity...
From the kitchen recipe book to the boarsroom presentation, the OtterBox Agility Tablet System turns tablets into one of the most versatile pieces of handheld technology available. Available now, the... Read more
Launch of New Car App Gallery and Open Develo...
Automatic, a company on a mission to bring the power of the Internet into every car, has announced the launch of the Automatic App Gallery, an app store for nearly every car or truck on the road... Read more
Memorial Day Weekend Sale: 13-inch 1.6GHz Mac...
Best Buy has the new 13″ 1.6GHz/128GB MacBook Air on sale for $849 on their online store this weekend. Choose free shipping or free local store pickup (if available). Sale price for online orders... Read more
Memorial Day Weekend Sale: 27-inch 3.5GHz 5K...
Best Buy has the 27″ 3.5GHz 5K iMac on sale for $2099.99 this weekend. Choose free shipping or free local store pickup (if available). Sale price for online orders only, in-store prices may vary.... Read more
Sale! 16GB iPad mini 3 for $349, save $50
B&H Photo has the 16GB iPad mini 3 WiFi on sale for $349 including free shipping plus NY sales tax only. Their price is $50 off MSRP, and it’s the lowest price available for this model. Read more
Price drop on 2014 15-inch Retina MacBook Pro...
B&H Photo has dropped prices on 2014 15″ Retina MacBook Pros by $200. Shipping is free, and B&H charges NY sales tax only: - 15″ 2.2GHz Retina MacBook Pro: $1799.99 save $200 - 15″ 2.5GHz... Read more
With a Mission to Make Mobile Free, Scratch W...
Scratch Wireless, claiming to be the world’s first truly free mobile service, has announced the availability of a new Scratch-enabled Android smartphone, the Coolpad Arise. The smartphone is equipped... Read more
First-Ever Titanium Alloy Curved iPhone 6 Scr...
One of the most common problems with mobile phones is damage to the screens. The slightest drop can cause a dreaded spider web of gashes and cracks in the glass panel surface that can cost $hundreds... Read more
Preorder new 12-inch MacBook, $10 off, save o...
Adorama has new 12″ Retina MacBooks available for preorder for $10 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... Read more
Will iOS 9 Finally Bring Productivity Friendl...
Ah, the irony. From its original announcement in 2010, Apple has doggedly insisted that the iPad remain “simple,” thus arbitrarily limiting its considerable potential as a content creation and... 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
Architect / Senior Software Engineer, *Apple...
Changing the world is all in a day039s work at Apple . If you love innovation, here039s your chance to make a career of it. You039ll work hard. But the job comes with 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* Pay Support Readiness Project Manage...
Changing the world is all in a day039s work at Apple . If you love innovation, here039s your chance to make a career of it. You039ll work hard. But the job comes with 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
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.