Tricks of the Mac Game Programming Gurus/TricksOfTheMacGameProgrammingGurus.iso/Information/CSMP Digest/volume 1/csmp-v1-129.txt

Text File | 1994-12-08 | 36.4 KB | 1,032 lines | [TEXT/R*ch]

C.S.M.P. Digest             Thu, 02 Jul 92       Volume 1 : Issue 129

Today's Topics:

    What is a 'Bus error'?
    System 7 crashes at weird times. New Virus?
    Amusing MPW C v3.2 Error Messages
    Serial i/o on the PB170?
    screen shot program needed
    How does Script Manager affect File Manager?
    Sound hardware question
    Caps-lock <=> Ctrl on the powerbook keyboard
    Sound Channel Failure
    Looking for Showinit



-------------------------------------------------------

From: [e-mail] (Etienne Bido)
Subject: What is a 'Bus error'?
Date: 29 May 92 11:54:46 GMT
Organization: VU Biology, Amsterdam, The Netherlands

I just bought a Mac IIcx, a great machine, but I'm getting sick of
all those 'Bus errors'. What is a bus error???

sysconfig:
MacIIcx
20 MB RAM (so I'm running mode 32 to use them)
13" Apple rgb with apple display card
system 7

I noticed that some of these errors dissapear when I turn mode32 off,
but there are still to many bus errors left.

any info would be appreciated.

- --
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Etienne Bido            || [e-mail]
Vrye Universiteit        || [e-mail]
Amsterdam

+++++++++++++++++++++++++++

From: [e-mail] (Werner Uhrig)
Date: 29 May 92 13:18:05 GMT
Organization: CS Dept, University of Texas at Austin


 [e-mail] (Etienne Bido) writes:
> I just bought a Mac IIcx, a great machine, but I'm getting sick of
> all those 'Bus errors'. What is a bus error???

>20 MB RAM (so I'm running mode 32 to use them)
>system 7

>I noticed that some of these errors dissapear when I turn mode32 off,
>but there are still to many bus errors left.

    a Bus Error is when a hardware bug encounters a software
    bug in the pressence of too much RAM ....

    <chuckle>....
- --
  [e-mail] |  ..!uunet!cs.utexas.edu!werner | [e-mail]

       "Free Advice and Opinions is our specialty.  Refunds Available"

+++++++++++++++++++++++++++

From: [e-mail] (Betty Lee)
Date: 29 May 92 22:16:04 GMT
Organization: Stanford University -- Electrical Engineering

[e-mail] (Etienne Bido) writes:

+ I just bought a Mac IIcx, a great machine, but I'm getting sick of
+ all those 'Bus errors'. What is a bus error???
+
+ I noticed that some of these errors dissapear when I turn mode32 off,
+ but there are still to many bus errors left.

Some bus errors happen when a program isn't 32-bit clean and you're running
32-bit mode.  Some happen (on my computer at least) when the program looks
for a non-existant FPU.  Some just happen.  If you install Macsbug, you might
get more explicit error messages.

- --
         Betty Lee          | The main difference between a User and a Hacker:
      P. O. Box 5748        |    A User buys a faster computer to spend
    Stanford, CA 94309      |    _less_ time with it.  Happy hacking!
[e-mail] |                          -- From rec.humor.funny

+++++++++++++++++++++++++++

From: [e-mail] (Ed Watkeys)
Date: Sat, 30 May 92 19:57:16 EDT
Organization: Distant Software


In article <[e-mail]> (comp.sys.mac.system,comp.sys.mac.programmer), [e-mail] (Betty Lee) writes:
>
> Some bus errors happen when a program isn't 32-bit clean and you're running
> 32-bit mode.  Some happen (on my computer at least) when the program looks
> for a non-existant FPU.  Some just happen.  If you install Macsbug, you might
> get more explicit error messages.

Another nice way to get a bus error is to reference odd memory addresses --
beware of pointer arithmetic!

Ed

- --
Ed Watkeys, Sys Admin.  "...The errors of great men are more venerable
Distant Software         because they are more fruitful than the truths
[e-mail]     of little men..."  -- Friedrich Nietzsche

+++++++++++++++++++++++++++

From: [e-mail] (Carl Baltrunas & Cherie Marinelli 1.5v4)
Date: 1 Jun 92 10:13:35 GMT
Organization: Catalyst Art


In article <[e-mail]> (comp.sys.mac.system,comp.sys.mac.programmer), [e-mail] (Ed Watkeys) writes:
>
> In article <[e-mail]> (comp.sys.mac.system,comp.sys.mac.programmer), [e-mail] (Betty Lee) writes:
> >
> > Some bus errors happen when a program isn't 32-bit clean and you're running
> > 32-bit mode.  Some happen (on my computer at least) when the program looks
> > for a non-existant FPU.  Some just happen.  If you install Macsbug, you might
> > get more explicit error messages.
>
> Another nice way to get a bus error is to reference odd memory addresses --
> beware of pointer arithmetic!
>
Ok... what I'd like to know is can anyone tell me what I should look at
when a buss error occurs.  I'm running Macsbug, and my machine has had the
infamous buss error many many times since I started using system 7.0.  I'm
now running system 7.0 with tuneup 1.1.1 and I have had what seems to be
the same couple of buss errors regardless of whether I have 32-bit on/off,
whether I have VM on/off.

The errors all seem to be at -stripaddress +08C4 (or offset +08B4)... and
from various extensions, mostly ATM 2.0.3 (which is supposed to be 32-bit
clean).

  -stripaddress+08B4/  MOVEM.L  D0/A0,-(A7)

  -stripaddress+08C4/  MOVE.L   (A1),$0008(A6)
                  A1/  FFFFFFFF
                  A6/  00363DF8

I didn't record the registers from the first one listed here, but the
second one appears to be referencing 'FFFFFFFF' which is not a longword
address.  That MAY be THE problem... but, what I'm most confused about
is that -stripaddress is in the kernel OS (or so I assume) and user progs
would not be calling it directly... or would they? [Q: for c.s.m.programmer]

So what inside the OS keeps bombing?  Is there anything I should do, or can
do to determine if it is the app that is running that is at fault, or some
thing wrong in the OS/ROM?  Anyone know who I can send the info to if it
will help Apple/Software-companies solve problems.

It seems sporadic... the same operation done in exactly the same way may
cause the problem, yet again... it may not.  Sometimes it appears to be
very reproduceable... (I have such a case now with a copy of Compactor 1.21
but that might be solved by upgrading to the newest version of Compact Pro).

HELP?

- -Carl

Redirect followups to the appropriate place, but I usually only have time
for c.s.m.system and not c.s.m.programmer.  E-mail is fine, and c.s.m.system
if others are interested and can help out.



Carl A Baltrunas - Catalyst Art - [e-mail]
Cherie Marinelli - Bijoux - [e-mail]
UUCP: uunet!oliveb!tymix!udwarf!{carl or cherie}
     {carl or cherie}@udwarf.UUCP  (if these fail: [e-mail])

---------------------------

From: [e-mail] (Kevin Hill)
Subject: System 7 crashes at weird times. New Virus?
Date: 25 May 92 10:39:49 GMT
Organization: Crash TimeSharing, El Cajon, CA


  I am currently running system 7.0.1 with the following extensions:


   Think Back, Magic Apple, switch. CDEV's that I am running are as follows:
    SuperClock!...
   I have a SE/30 with 5megs of memory, a 40meg hard drive and nothing else.
The problem that I have is when I am using scroll bars, or using the menus, the
mac crashes with no warning.  It seems to do this randomly.  What I am wondering
is if there is a virus out that disenfectant does not check for yet. My version
of Disenfectant is 2.8.
   I have had this error with all my extensions and CDEV's disabled.  Can anyone
shed some light on this?
   Thanks!
  -Kevin Hill

+++++++++++++++++++++++++++

From: [e-mail] (Kent P Miller)
Organization: Engineering Computer Network, University of Oklahoma, Norman, OK, USA
Date: Mon, 25 May 1992 20:33:11 GMT

In article <[e-mail]> [e-mail] (Kevin Hill) writes:
>mac crashes with no warning.  It seems to do this randomly.  What I am wondering
>is if there is a virus out that disenfectant does not check for yet. My version
>of Disenfectant is 2.8.
>   I have had this error with all my extensions and CDEV's disabled.  Can anyone

I will answer you and try to save the guy who usually twists off on this
a stress-induced heart attack.

1.  Don't assume that since your mac is crashing that it is a new virus.
This is bad for many reasons.  I'll share my personal experience.  If one
of my client's computers crash, they say, "Maybe we have a virus", even
though none of them own floppy disks and they have no access to the outside
computer world.  Don't propagate this by causing virus panic.

2.  Don't post this in the programming newsgroup.  It doesn't belong here.
Since this is the only mac newsgroup I regularly read, I don't care where
else you post it.  Maybe in comp.sys.mac.misc.

Now, if you have rebooted with all your extensions off and you still crash,
try booting from floppy.  If that works, reinstall a fresh system.  If you
are still crashing, get another copy of the system install disks from
somewhere else.

Good Luck!

Kent

- --
- -----------------------
Kent Miller
[e-mail]
- -----------------------

+++++++++++++++++++++++++++

From: [e-mail] (Jeremiah Blatz)
Date: 2 Jun 92 01:52:20 GMT
Organization: Dartmouth College, Hanover, NH

In article <[e-mail]>
[e-mail] (Kevin Hill) writes:

> I am currently running system 7.0.1 with the following extensions:
>
>
>    Think Back, Magic Apple, switch. CDEV's that I am running are as follows:
>     SuperClock!...

There's ine more extension that you should have: System 7.0 Tuner. This
is available from "your official Apple dealer," It's a big help.

Jeremiah

   _______________________
      / /    /  \  /  \  /
     / /___ /___/ /___/ /
    / /    / \   /   / /
\__/ /___ /   \ /___/ /___

---------------------------

From: killer@wimpy (karl kowalski)
Subject: Amusing MPW C v3.2 Error Messages
Date: 27 May 92 04:52:45 GMT
Organization: The Aerospace Corporation; El Segundo, CA

Hi!

This may be a repeat of an earlier post, but what the heck.

Has anyone ever seen the following out of MPW C v3.2:

### Error 32 ...And the lord said, 'lo, there shall only be case or
default labels inside a switch statement'

- - or -

### Error 199 type in (cast) must be scalar; ANSI 3.3.4; page 39, lines
10-11 (I know you don't care, I'm just trying to annoy you)

?

Any other interesting error messages?

Anyone?

I have to admit, they are quite amusing. And actually on occasion, worth
the laughs.

Cheers,

Karl G Kowalski
[e-mail]
[e-mail] (NeXTmail)

+++++++++++++++++++++++++++

From: [e-mail] (Richard Clark)
Date: 27 May 92 16:52:18 GMT
Organization: Apple Computer Inc., Cupertino, CA

killer@wimpy (karl kowalski) writes:

>Has anyone ever seen the following out of MPW C v3.2:

>### Error 32 ...And the lord said, 'lo, there shall only be case or
>default labels inside a switch statement'
>- or -
>### Error 199 type in (cast) must be scalar; ANSI 3.3.4; page 39, lines
>10-11 (I know you don't care, I'm just trying to annoy you)

>Any other interesting error messages?

  The error messages are stored as STR resources -- just type
   DeRez {Tools}C -only 'STR ' {RIncludes}Types.r
for a complete list.

...Richard
- --
Richard Clark   Instructor/Course Designer, Developer University    Apple Comp.

+++++++++++++++++++++++++++

From: [e-mail] (Alan J Rosenthal)
Organization: Dynamic Graphics Project, University of Toronto
Date: 30 May 92 18:52:29 GMT


ok, here's all the weird ones:

String literal too long (I let you have 512 characters, that's 3 more than ANSI
said I should)

...And the lord said, 'lo, there shall only be case or default labels inside a
switch statement'

a typedef name was a complete surprise to me at this point in your program

'Volatile' and 'Register' are not miscible

This struct already has a perfectly good definition

This union already has a perfectly good definition

This enum already has a perfectly good definition

type in (cast) must be scalar; ANSI 3.3.4; page 39, lines 10-11 (I know you
don't care, I'm just trying to annoy you)

This array has no size, and that's bad

Can't cast a void type to type void (because the ANSI spec. says so, that's why)

Huh ?

can't go mucking with a 'void *'

we already did this function

This label is the target of a goto from outside of the block containing this
label AND this block has an automatic variable with an initializer AND your
window wasn't wide enough to read this whole error message

Call me paranoid but finding '/*' inside this comment makes me suspicious

This function has an explicit return type and deserves a return value

Invalid formal argument -- did you mean pointer to function here?

You can't have an array of functions -- did you mean pointers to functions?

Too many errors on one line (make fewer)

Symbol table full - fatal heap error; please go buy a RAM upgrade from your
local Apple dealer

---------------------------

From: [e-mail] (Jefferson Provost)
Subject: Serial i/o on the PB170?
Date: 27 May 92 20:10:57 GMT
Organization: Psychology, Carnegie Mellon, Pittsburgh, PA


Hey net.mac.hackers,

I have an application that communicates through the modem port with an
external device.  The program seems to run without problems (with
respect to the serial i/o) on all the platforms we've tried it on except
for the PowerBook 170.  We haven't tried on any other PowerBooks but we
have tried it on the Plus, Classic, IIsi, IIx, IIci, II, IIfx, and
Quadra 700, all do the serial I/O without any problem.

With the PB 170, however, things have been strange.  First I was having
problems because I forgot to switch from internal to external modem.
After I fixed that, the program would crash (hang, or crash into
MacsBug) as soon as I write to the external device the first time.  I'm
writing with PBWrite, asynchronously, and as soon as my code calls the
trap, I crash.

I haven't run into this behavior at all with other machines.  Is there
something I need to know about the PowerBook serial port or serial
driver and deal with?

Any help will be appreciated,

Thanx,

Jeff

- -----
|Jefferson Provost                          | [e-mail]
| Research Programmer - PsyScope Project    | [phone]
| Department of Psychology                  | Baker Hall 331g
| Carnegie Mellon, Pittsburgh. PA 15213     |

+++++++++++++++++++++++++++

From: [e-mail] (Kent P Miller)
Organization: Engineering Computer Network, University of Oklahoma, Norman, OK, USA
Date: Sun, 31 May 1992 13:43:44 GMT

In article <[e-mail]> [e-mail] (Jefferson Provost) writes:
>After I fixed that, the program would crash (hang, or crash into
>MacsBug) as soon as I write to the external device the first time.  I'm
>writing with PBWrite, asynchronously, and as soon as my code calls the

Jeff,

Tried to mail you, but I couldn't.

I don't know exactly what the problem is, but I can tell you that if the
PowerBook has the battery saver on, the power to the external serial ports
is not enabled.

When they released the PowerBooks and the Quadras, they (Apple) released a
set of tech notes about developing for them.  These may (or may not) have
what you need in them.

You might also check the Power Manager chapter of Inside Mac VI (31).  On
page 18, it describes 5 procedures used to control power to the serial ports.
procedure AOn (turns on internal modem and power to portA)
procedure AOnIgnoreModem;  (turns on power to PortA, leaves internal modem off)
procedure BOn (turns on printer port)
procedure AOff; procedure BOff; (turns the ports off)

Hope this helps.

Kent

- --
- -----------------------
Kent Miller
[e-mail]
- -----------------------

---------------------------

From: [e-mail] (Ralph Paul Ritchey)
Subject: screen shot program needed
Date: 31 May 92 17:44:38 GMT
Organization: Drexel University

Hello all:

I am looking for a PD or shareware program which lets you take
screen shots while menus are pulled down etc.  Anyone
who knows of one, I would appreciate getting info on it (where
I can get it, etc.).  Thanks for the help in advance.

Ralph Ritchey
[e-mail]

+++++++++++++++++++++++++++

From: [e-mail] (Miika Asunta)
Date: 31 May 92 20:06:42 GMT
Organization: Finnish Academic and Research Network Project - FUNET

In <[e-mail]>
[e-mail] (Ralph Paul Ritchey) writes:

>Hello all:
>I am looking for a PD or shareware program which lets you take
>screen shots while menus are pulled down etc.  Anyone
>who knows of one, I would appreciate getting info on it (where
>I can get it, etc.).  Thanks for the help in advance.

The best one is 'Capture'. It's commercial and available at your
local dealer.

Miika
- --
Miika Asunta
[e-mail]            Double Bass Player
tel. [phone]            Macintosh Programmer

+++++++++++++++++++++++++++

From: [e-mail] (Tomas Hansson)
Organization: York University, Toronto, Canada
Date: Sun, 31 May 1992 21:31:52 GMT

In article <[e-mail]> [e-mail] (Miika Asunta) writes:
>In <[e-mail]>
>[e-mail] (Ralph Paul Ritchey) writes:
>
>>Hello all:
>>I am looking for a PD or shareware program which lets you take
>>screen shots while menus are pulled down etc.  Anyone
>>who knows of one, I would appreciate getting info on it (where
>>I can get it, etc.).  Thanks for the help in advance.
>
>The best one is 'Capture'. It's commercial and available at your
>local dealer.

Why not settle for some shareware?! Try out Flash-It 2.2!!
It works just fine AND will capture menus etc. It can be found on
sumex-aim.stanford.edu in the cp directory.

/Tomas
[e-mail]


+++++++++++++++++++++++++++

From: [e-mail] (Keith Rollin)
Date: 1 Jun 92 00:40:54 GMT
Organization: Taligent

In article <[e-mail]>, [e-mail]
(Ralph Paul Ritchey) writes:
>
> Hello all:
>
> I am looking for a PD or shareware program which lets you take
> screen shots while menus are pulled down etc.  Anyone
> who knows of one, I would appreciate getting info on it (where
> I can get it, etc.).  Thanks for the help in advance.
>

In article <[e-mail]>, [e-mail] (Miika
Asunta) writes:
>
> The best one is 'Capture'. It's commercial and available at your
> local dealer.
>

In article <[e-mail]>, [e-mail]
(Tomas Hansson) writes:
>
> Why not settle for some shareware?! Try out Flash-It 2.2!!
> It works just fine AND will capture menus etc. It can be found on
> sumex-aim.stanford.edu in the cp directory.


Ah, you're all trying to milk this poor boy.  :-)  Step right up to
ftp.apple.com and get some freeware that includes the source code. It's in
/dts/mac/sc/sc-022-screenfkey.hqx.

- --
Keith Rollin
Phantom Programmer
Taligent, Inc.


---------------------------

From: [e-mail] (Jim Walker)
Subject: How does Script Manager affect File Manager?
Organization: USC  Department of Computer Science
Date: 30 May 92 21:56:58 GMT

When one is possibly running under a non-Roman script system, can one still
count on a file name not containing a colon (:), and being able to use
colons to separate the parts of a pathname?

- --

 -- Jim Walker  USC Dept. of Math.  [e-mail]

+++++++++++++++++++++++++++

From: [e-mail] (Ed Watkeys)
Date: Mon, 1 Jun 92 00:50:54 EDT
Organization: Distant Software


In article <[e-mail]> (comp.sys.mac.programmer), [e-mail] (Jim Walker) writes:
> When one is possibly running under a non-Roman script system, can one still
> count on a file name not containing a colon (:), and being able to use
> colons to separate the parts of a pathname?

I think it's because of stuff like this that Apple tells you not to play around
with pathnames this way. If you're running under A/UX, the slash is the separator,
so you're in trouble if you're assuming that colons separate directories in
a pathname. This is in Inside Macintosh *somewhere*, if I recall correctly.

Ed

- --
Ed Watkeys, Sys Admin.  "...The errors of great men are more venerable
Distant Software         because they are more fruitful than the truths
[e-mail]     of little men..."  -- Friedrich Nietzsche

---------------------------

From: [e-mail] (Paul Potts)
Subject: Sound hardware question
Date: 28 May 92 13:46:08 GMT
Organization: Instructional Technology Laboratory, University of Michigan

I suspect the answer to this question is "no way," but I thought I'd ask
anyway...

I have code to open channels, play digitized sound, and all that. I'm a
little unclear on the stereo capabilities of certain Mac models. I-M 6 seems
to be pretty explicit, so I guess what I'm asking is "is I-M 6 absolutely
correct, or is there a way around this?"  Re:

- - Is there a way that I can open a sampled channel on the left stereo side
only, play a sound, close the channel, then open a sampled channel on the
right, and play a sound through the right stereo side only?  Will this work
on some Macintosh models and not others?  (which models will it work on?)

- - On those models which combine the stereo signals into a mono output, where
in the computer is this done?  What I'm asking translates to "If I'm willing
to void my warranty and risk electric shock and certain doom, is it possible
to un-combine the combined stereo signals and route them to separate left
and right channels?"  (If the signals are combined on-chip, the answer is
probably no; if there is a piece of wiring somewhere that links them, then
I can probably modify it. I'm fairly handy with a soldering gun.)

Please don't just say "read I-M 6." I've read it, and it seems pretty clear,
but I'm trying to see if there is a way around it. I'd like to be able to
play sounds separately in the left and right channels of a IIcx. Fidelity
isn't that important; noise floor isn't that important. This is to assist
someone with an engineering experiment for an academic department.

- --
Paul R. Potts, Software Designer --- [e-mail] <--- me!

+++++++++++++++++++++++++++

From: [e-mail] (Jim Reekes)
Date: 28 May 92 23:53:17 GMT
Organization: Apple Computer, Inc.

In article <[e-mail]>, [e-mail] (Paul Potts) writes:
>
> I suspect the answer to this question is "no way," but I thought I'd ask
> anyway...
>
> I have code to open channels, play digitized sound, and all that. I'm a
> little unclear on the stereo capabilities of certain Mac models. I-M 6 seems
> to be pretty explicit, so I guess what I'm asking is "is I-M 6 absolutely
> correct, or is there a way around this?"  Re:
>
> - Is there a way that I can open a sampled channel on the left stereo side
> only, play a sound, close the channel, then open a sampled channel on the
> right, and play a sound through the right stereo side only?  Will this work
> on some Macintosh models and not others?  (which models will it work on?)
>
> - On those models which combine the stereo signals into a mono output, where
> in the computer is this done?  What I'm asking translates to "If I'm willing
> to void my warranty and risk electric shock and certain doom, is it possible
> to un-combine the combined stereo signals and route them to separate left
> and right channels?"  (If the signals are combined on-chip, the answer is
> probably no; if there is a piece of wiring somewhere that links them, then
> I can probably modify it. I'm fairly handy with a soldering gun.)
>
> Please don't just say "read I-M 6." I've read it, and it seems pretty clear,
> but I'm trying to see if there is a way around it. I'd like to be able to
> play sounds separately in the left and right channels of a IIcx. Fidelity
> isn't that important; noise floor isn't that important. This is to assist
> someone with an engineering experiment for an academic department.

The Mac currently never mixes a stereo source into a mono output.  All machines
that support stereo in hardware are always playing in stereo.  Some machines
will play both the left and right outputs to the internal speaker.  The
external speaker jack is always the stereo output, if stereo is available.

Use Gestalt to determine if stereo and mixing to the internal speaker is
available on your machine.  There no such test avalable for System 6.0.x
users.

- -----------------------------------------------------------------------
Jim Reekes, Polterzeitgeist  |     Macintosh Toolbox Engineering
                             |          Sound Manager Expert
Apple Computer, Inc.         | "All opinions expressed are mine, and do
20525 Mariani Ave. MS: 81-KS |   not necessarily represent those of my
Cupertino, CA 95014          |       employer, Apple Computer Inc."

+++++++++++++++++++++++++++

From: [e-mail] (Jamie R. McCarthy)
Organization: Kalamazoo College
Date: Fri, 29 May 1992 09:46:14 GMT

[e-mail] (Paul Potts) writes:
>
>I suspect the answer to this question is "no way," but I thought I'd ask
>anyway...
>
>- Is there a way that I can open a sampled channel on the left stereo side
>only, play a sound, close the channel, then open a sampled channel on the
>right, and play a sound through the right stereo side only?

No way!  (Heh heh.)

Can you, for example:

SndChannelPtr mySndChannelPtr = NULL;
FailOSErr( SndNewChannel(&mySndChannelPtr, sampledSynth,
    initChanLeft,
    NULL );
sendSndToChannelWithBufferCmd(mySndChannelPtr);
pauseUntilSoundIsDone();
FailOSErr( SndDisposeChannel(mySndChannelPtr, TRUE) );
FailOSErr( SndNewChannel(&mySndChannelPtr, sampledSynth,
    initChanRight,
    NULL );
sendSndToChannelWithBufferCmd(mySndChannelPtr);
pauseUntilSoundIsDone();
FailOSErr( SndDisposeChannel(mySndChannelPtr, TRUE) );

>Please don't just say "read I-M 6."

Read I-M 6!  (Heh heh.)

As far as I know, this'll work on any machine with stereo.  Corrections
are welcome...
- --
 Jamie McCarthy     Internet: [e-mail]     AppleLink: j.mccarthy
 When I read the 486 manual, I was amazed that they had got all this
  working.  Then I got to the bug list in the back, and said, "Oh.
  They _didn't_ get it all working."  - Mitch Bradley

+++++++++++++++++++++++++++

From: [e-mail] (Paul Potts)
Organization: Instructional Technology Laboratory, University of Michigan
Date: Fri, 29 May 92 15:54:09 GMT

In article <[e-mail]> [e-mail] (Jamie R. McCarthy) writes:
>[e-mail] (Paul Potts) writes:
>>
>>I suspect the answer to this question is "no way," but I thought I'd ask
>>anyway...
>>

Thanks to everyone who sent me corrections and code. For some reason even
though I had read I-M 6, I was under the impression that the IIcx and
a couple of others mixed the stereo sound to mono output to the headphone
jack. I was confused. Someone I'm doing some consulting for was telling me
that it wasn't working, and my poor memory did the rest. Thanks for the
assistance.


- --
 ---> Just when did the idea that we ought to make minor changes in
our industrial activities in order to save endangered species become
"environmental extremism," and the willingness to fight become "eco-terrorism?"
Paul R. Potts, Software Designer --- [e-mail] <--- me!

+++++++++++++++++++++++++++

From: [e-mail] (Jim Reekes)
Date: 1 Jun 92 20:38:59 GMT
Organization: Apple Computer, Inc.

In article <[e-mail]>, [e-mail] (Jamie R. McCarthy) writes:
>
> [e-mail] (Paul Potts) writes:
> >
> >I suspect the answer to this question is "no way," but I thought I'd ask
> >anyway...
> >
> >- Is there a way that I can open a sampled channel on the left stereo side
> >only, play a sound, close the channel, then open a sampled channel on the
> >right, and play a sound through the right stereo side only?
>
> No way!  (Heh heh.)
>
> Can you, for example:
>
> SndChannelPtr mySndChannelPtr = NULL;
> FailOSErr( SndNewChannel(&mySndChannelPtr, sampledSynth,
>     initChanLeft,
>     NULL );
> sendSndToChannelWithBufferCmd(mySndChannelPtr);
> pauseUntilSoundIsDone();
> FailOSErr( SndDisposeChannel(mySndChannelPtr, TRUE) );
> FailOSErr( SndNewChannel(&mySndChannelPtr, sampledSynth,
>     initChanRight,
>     NULL );
> sendSndToChannelWithBufferCmd(mySndChannelPtr);
> pauseUntilSoundIsDone();
> FailOSErr( SndDisposeChannel(mySndChannelPtr, TRUE) );
>
> >Please don't just say "read I-M 6."
>
> Read I-M 6!  (Heh heh.)
>
> As far as I know, this'll work on any machine with stereo.  Corrections
> are welcome...

You should be able to use the reInitCmd instead of closing and opening
a channel.  I haven't tried it myself, but it should work.




- -----------------------------------------------------------------------
Jim Reekes, Polterzeitgeist  |     Macintosh Toolbox Engineering
                             |          Sound Manager Expert
Apple Computer, Inc.         | "All opinions expressed are mine, and do
20525 Mariani Ave. MS: 81-KS |   not necessarily represent those of my
Cupertino, CA 95014          |       employer, Apple Computer Inc."



---------------------------

From: [e-mail] (amir kishon)
Subject: Caps-lock <=> Ctrl on the powerbook keyboard
Organization: Yale University Computer Science Dept., New Haven, CT 06520-2158
Date: Sun, 31 May 1992 21:36:36 GMT

Does anyone have a suggestion on how to exchange the caps-lock key
with the ctrl key on a powerbook keyboard. I tried changing the 'KCHR'
table - this indeed exchanged their mapping but the remapped ctrl key gets
'locked' when pressed.

Thanks,

- --
Amir Kishon                                 ARPA:   [e-mail]
Yale University, Computer Science Dept.             [e-mail]
P.O.Box 2158 Yale Station                   BITNET: [e-mail]
New Haven, CT. 06520-2158                   UUCP:   decvax!yale!kishon-amir

+++++++++++++++++++++++++++

From: [e-mail] (Brian Bechtel)
Date: 1 Jun 92 00:43:48 GMT
Organization: Apple Computer Inc., Cupertino, CA

[e-mail] (amir kishon) writes:

>Does anyone have a suggestion on how to exchange the caps-lock key
>with the ctrl key on a powerbook keyboard. I tried changing the 'KCHR'
>table - this indeed exchanged their mapping but the remapped ctrl key gets
>'locked' when pressed.

You can't change the behavior of the caps lock key on the PowerBook
keyboard.  You can change the mapping of the keyboard, but the caps lock
key has special behavior built into the keyboard processor.

- --Brian Bechtel     [e-mail]     "My opinion, not Apple's"

---------------------------

From: [e-mail] (Brad Morris)
Subject: Sound Channel Failure
Date: 28 May 92 21:01:11 GMT
Organization: University of Chicago Computing Organizations

I have noticed a failure of the sound channel under the following
circumstances:

My program plays sounds using a simple routine.  First it sends a
quietCmd to make sure the channel has stopped playing (important because
this is a game and the sound has to be cut off to let the next sound play).
Next, I send a bufferCmd with a pointer to my sampled sound.  So far so
good.  Everything works until I try to jam too many of these at a single
time.  This is caused by the user pressing multiple keys on the keyboard
at once.  If I try to jam things too tightly, the channel stops playing
sounds.  If I examine the channel when this has happened, I find that the
flags field is always set to 7 and qHead and qTail point to appropriate
sounds which should be playing but are not.  What I ended up doing is to
check for flag=7 and something in the buffer (qHead > -1) and deallocating
and reallocating the sound channel if this happens.  This seems to work.
This leaves me with two good questions.  Is there any place that the SndChannel
structure is well documented (not just used internally stuff).  And two, has
anyone else seen this and what did they do.  Is there something less drastic
than allocation/deallocation?

Thanks-

Brad Morris
[e-mail]

+++++++++++++++++++++++++++

From: [e-mail] (Jim Reekes)
Date: 1 Jun 92 20:35:54 GMT
Organization: Apple Computer, Inc.

In article <[e-mail]>, [e-mail] (Brad Morris) writes:
>
> I have noticed a failure of the sound channel under the following
> circumstances:
>
> My program plays sounds using a simple routine.  First it sends a
> quietCmd to make sure the channel has stopped playing (important because
> this is a game and the sound has to be cut off to let the next sound play).
> Next, I send a bufferCmd with a pointer to my sampled sound.  So far so
> good.  Everything works until I try to jam too many of these at a single
> time.  This is caused by the user pressing multiple keys on the keyboard
> at once.  If I try to jam things too tightly, the channel stops playing
> sounds.  If I examine the channel when this has happened, I find that the
> flags field is always set to 7 and qHead and qTail point to appropriate
> sounds which should be playing but are not.  What I ended up doing is to
> check for flag=7 and something in the buffer (qHead > -1) and deallocating
> and reallocating the sound channel if this happens.  This seems to work.
> This leaves me with two good questions.  Is there any place that the SndChannel
> structure is well documented (not just used internally stuff).  And two, has
> anyone else seen this and what did they do.  Is there something less drastic
> than allocation/deallocation?

You should not be assuming the flags are going to be set to anything.
It will certainly be changing in the next release of the Sound Manager.
(I don't know when that is, but it will change the flags.)

All of the structures that can be used by programmers are documented.
The others are reserved for Apple's use only.

There isn't enough information in your message, but if you attempt to send
a bufferCmd using SndDoImediate while a buffer is still playing, the
System 7.0 Sound Manager will ignore the new buffer.  What you have to do
to cancel a sound and start a new one is this:


while a sound is playing....

SndDoImmediate(flushCmd)
SndDoImmediate(quietCmd)
SndDoCommand(bufferCmd)

- --- or ---

while a sound is playing

SndDoImmediate(flushCmd)
SndDoImmediate(quietCmd)
while SndChannelStatus == noErr and not scBusy
SndDoImmediate(bufferCmd)

Both of these examples are functionally the same.



- -----------------------------------------------------------------------
Jim Reekes, Polterzeitgeist  |     Macintosh Toolbox Engineering
                             |          Sound Manager Expert
Apple Computer, Inc.         | "All opinions expressed are mine, and do
20525 Mariani Ave. MS: 81-KS |   not necessarily represent those of my
Cupertino, CA 95014          |       employer, Apple Computer Inc."



---------------------------

Subject: Looking for Showinit
From: [e-mail]
Date: 29 May 92 16:26:56 +1200
Organization: University of Canterbury, Christchurch, New Zealand

In Technote 247, Pete Helme writes :

>The ShowINIT icon mechanism that was popularized
>by Paul Mercer is great.  In fact, we encourage it's use
>and we gladly give out the ShowINIT MPW object file, with
>installation help, to anyone who asks for it.

Can anyone send me this object file, or the source code for
this routine, or suggest where I might find it ?  I don't
know how to contact Apple DTS by Email.

Thanks,
Ken Allott.

+++++++++++++++++++++++++++

From: [e-mail] (Tim Dierks, software saboteur)
Date: 30 May 92 21:28:05 GMT
Organization: MacDTS Misfits

In article <[e-mail]>, [e-mail] writes:
>
> In Technote 247, Pete Helme writes :
>
> >The ShowINIT icon mechanism that was popularized
> >by Paul Mercer is great.  In fact, we encourage it's use
> >and we gladly give out the ShowINIT MPW object file, with
> >installation help, to anyone who asks for it.
>
> Can anyone send me this object file, or the source code for
> this routine, or suggest where I might find it ?  I don't
> know how to contact Apple DTS by Email.

I'm including the source and object below.  I think this code
is of great use to a reasonably large number of people and
that the source can be pretty educational; among other things,
it shows how to use QuickDraw at INIT time and how to plot
System 7-style color icons manually (useful under System 6);
that's why I'm posting it directly.

Enjoy;
Tim Dierks
MacDTS, but I speak for the trees

(This file must be converted with BinHex 4.0)
- -8rF%N!$KlRPrh3p$BhFAi$d'UrE+3PVLlaTGp'hJ$3j)3R$J`SXK!@HSh"6'A!E