HDTenEightyP/NetNews huggingface dataset:
From: lederman@taney.uscghq.uscg.mil
Newsgroups: comp.sys.mac.hardware
Subject: Re: Hard disk partitions
Date: 13 Oct 92 09:21:32 EST
Organization: United States Coast Guard

In article <2192@deadmin.ucsd.edu>, gumby@ucsd.edu (Henry Ptasinski) writes:
> I was poking around the hard disk on my brother's SE the other day, and I came  
> across a partition on the disk with the following description:

    You don't say what size your disk is, which might matter.

    There was an aritcle in Mac TidBITS which said that Apple
 disks which are near 40MB in size are limited to exactly 40,000K,
 because this is the maximum that will fit on one apple tape drive
 cartridge.  The article said this was sstill beging done on
 PowerBook drives, even though the Apple tape drive isn't
 supported under System 7 and was never an option associated with
 the PowerBook.

    So I went and looked at the 40MB drive which came with my
 IIcx, and sure enough, it was formatted with some unused space at
 the end.  I re-partitioned and got over 900k extra space on it.
From: ForDavid@outpost.SF-Bay.org (Michael Peirce)
Newsgroups: comp.sys.mac.hardware
Subject: Re: Performas, LCII's and questions!
Date: 6 Oct 92 17:12:37 GMT
Reply-To: ForDavid@outpost.SF-Bay.org (Michael Peirce)
Organization: Peirce Software
X-Mailer: uAccess - Macintosh Release: 1.6v1


In article <1aqgodINN43t@agate.berkeley.edu> (comp.sys.mac.hardware), daver@sunspot.ssl.berkeley.edu (David Ray) writes:
> In article <1992Oct5.205928.28667@dartvax.dartmouth.edu> hades@Dartmouth.Edu writes:
> 
> >What are you talking about in respect to 32-bit clean? The LCII
> >has always been a 32-bit clean machine.
> 
> I think he is referring to the fact that in 32 bit mode, the LCII runs at
> 1/2 the clock speed to handle 32 bit data on the 16 bit bus. It will
> run 32-bit mode (this is referred to as "32-bit clean") but it does so at
> 1/2 the speed.
> Is this the same on the Performa?

I think you are confused.  The LCII has a 16-bit data bus.  This means
that data is transfered from memory 16-bits at a time.  Some other
Macs have a 32-bit bus; they transfer data 32-bits at a time.

THIS HAS NOTHING TO DO WITH "32-BIT MODE".  This refers to 32-bit
addressing mode vs. 24-bit addressing mode.  When a Mac is using 24-bit
addressing it can access a theoretical maximum of 16 Megabytes of memory
(2 raised to the 24th power) (there are reasons that some of these
Macs can't access this much memory - like not having the hardware
setup to make us of it).  When a Mac is using 32-bit addressing the 16M
limit is raised a tad (gigabytes! = more than we can make use of (today)).

These two issues are completely unrelated.  Macs with 16-bit data
buses can be run in 24 or 32-bit memory mode, as can Macs with 32-bit
data buses.

The LCII with it's 16-bit data bus is almost 1/2 the speed it would
have been if it had a 32-bit data bus (not really 1/2 because there
are things like caching that help out).  But then it would have cost
more too.

P.S.  There are other 32-bit modes too.  QuickDraw has a variation
called 32-bit Color QuickDraw.  This refers to being able to refer
to a color using 32-bits of data per color.  Again, this has nothing
to do with the above.  it's just that 32 is an rather important number
with computers.

--  Michael Peirce      --   peirce@outpost.SF-Bay.org
--  Peirce Software     --   Suite 301, 719 Hibiscus Place
--                      --   San Jose, California USA 95117
--  Makers of...        --   voice: (408) 244-6554 fax: (408) 244-6882
--            SMOOTHIE  --   AppleLink: peirce & America Online: AFC Peirce
From: carlton@cs.berkeley.edu (Mike Carlton)
Newsgroups: comp.sys.mac.hardware
Subject: Re: Powerbook Caps Lock
Date: 13 Oct 1992 18:16:13 GMT
Organization: University of California, Berkeley
Distribution: world
Reply-To: carlton@cs.berkeley.edu
NNTP-Posting-Host: peets.berkeley.edu

In article <73339@apple.Apple.COM> blob@Apple.COM (Brian Bechtel) writes:
> chogend1@cc.swarthmore.edu (Chris Hogendorn) writes:
> 
> >I'm forever hitting the caps lock key on my Powerbook 140. Does anyone know
> >of a good way of disabling it? --> Chris
> 
> You can use one of several INITs, or you can add a keyboard map to your
> system which disables the capslock key.  Both inits and the KMAP are
> available from ftp.apple.com in /pub/powerbook.
> 
> --Brian Bechtel     blob@apple.com     "My opinion, not Apple's"

But these are only a half-assed solution for many of us -- we want to have
a _control_ key where the caps locks key is located.  There was mention 
many months ago that a few people at Apple were trying to come up with a
patch to allow this.  Does anyone know what happened to that effort?

The problem, from what I've been told and deduced, is that there is a keyboard
processor which must keep the state of the caps lock key.  Evidently there
is no way to find out the actual physical up or down position of the key from
this processor.

IMHO, this is very lame engineering on Apple's part.  I'm not criticizing
Brian here, everyone knows that he has been very helpful on the net.  I'm
mad at Apple's engineering corps -- supposedly they should be considering
user interface.  They run ads touting the "ergonomic" design of the powerbook.
How ergonomic is it when I have to stop typing and move my hand every time
I want to type a control character?

Let's face it -- Apple sells keyboards with different layouts.  Someone
realized at some point in the past that people have different needs and
preferences in keyboards.  Now, I don't blame Apple for selling powerbooks
with only one keyboard layout, it would be a little excessive to have 2
or more styles of each powerbook model.

But why do they make it IMPOSSIBLE to change the keyboard layout from software?
You can remap other keys -- but not the caps lock.  I understand about custom
chips and cutting production costs, but you've got a processor in there, it
cannot be that hard to allow one more key to be configurable.  I'd be willing
to bet that there was design review meeting that went something like this --
	Apple Engineer 1: see, we can use this custom keyboard controller and
		save two 74138s -- that's 12 cents production cost per machine.
	Apple Engineer 2: but, don't we lose the ability to remap caps lock
		if we do that?
	Apple Engineer 1: yes, but that doesn't matter, nobody uses control
		anyway.

WRONG -- some people do.  Enough people that you shouldn't go out of your
way to make it hard to change the worthless caps lock.

-- mike (carlton@cs.berkeley.edu)
From: abs0@coos.dartmouth.edu (Kelvin Leung)
Newsgroups: comp.sys.mac.hardware
Subject: Re: Woz in apple ad?
Date: 13 Oct 92 19:48:31 GMT
Organization: Dartmouth College, Hanover, NH

mike_steiner@qm.claris.com (Mike Steiner) writes:

>Don't forget that Jobs designed the case for the Apple II.

>+---------------------------------------------------------------------+
>|Now that I have a reader that can do .sigs, I can't think of a witty |
>|one to put here, so I won't.  All normal disclaimers apply.          |
>+---------------------------------------------------------------------+

You sure about this??? I thought Jobs&Woz hire a guy to design the case...

can anyone verify this?? (does anyone have Accidental Millionair handy?)

Yours Sincerely,
Kelvin
e-mail: abs0@coos.dartmouth.edu
Newsgroups: comp.sys.mac.hardware
From: bmartin@uhunix.uhcc.Hawaii.Edu (Brian Martin)
Subject: Re: Radius DirectColor/GX
Organization: University of Hawaii
Date: Mon, 12 Oct 1992 13:13:44 GMT

I had one of these boards, then sold it. I bought it because the Radius
Rocket that I bought didn't work with my old RasterOps 24-bit board.
The DirectColor/GX is incompatible with Silverlining. I didn't see
much of a performance improvement over the Apple 8-bit color card.

Best regards,

    Brian K. Martin, M.D.
    Martin Information Systems, Ltd.

INTERNET: bmartin@uhunix.uhcc.hawaii.edu
CompuServe: 76535,250
From: luigi@paris.CS.Berkeley.EDU (Luigi Semenzato)
Newsgroups: comp.sys.mac.hardware
Subject: Re: PB100 memory installation directions
Date: 9 Oct 1992 21:11:26 GMT
Organization: University of California, Berkeley
Distribution: world
NNTP-Posting-Host: paris.cs.berkeley.edu

In article <D2150035.fjq75j@outpost.SF-Bay.org>, peirce@outpost.SF-Bay.org
(Michael Peirce) writes:
|> I've gotten a number of requests to fax people the directions
|> for installing PB100 memory.  Rather than fax it all around the world

...

|> Again, DON"T DO THIS UNLESS YOU REALLY THINK YOU CAN.  It will void
|> your warrantee.  It might even destroy your PB100 if you do it wrong.
|> Think before you act.

Many thanks for the instructions and one important question: if this is
done properly, will it be possible to tell that the machine has been 
opened?  --Luigi
From: Borel@elsrfm.epfl.ch (Borel Philippe)
Newsgroups: comp.sys.mac.hardware
Subject: DIP Switches on a ROLAND DXY-990
Date: 15 Oct 92 07:30:41 GMT
Followup-To: comp.sys.mac.hardware
Organization: Ecole Polytechnique Federale de Lausanne

Hi!
Can somebody tell me the DIP switches configuration I must use to get
my DXY-990 plotter work with my Mac IIcx and MacPlot Pro ?

E-mail me the answer, please...


Phil
From: GFCARDINALE@poppy.ucdavis.edu (GEOGORY F. CARDINALE)
Newsgroups: comp.sys.mac.hardware
Subject: wanted:  info on where to buy a Plus PS
Date: 14 Oct 92 00:52:07 GMT
Organization: University of California, Davis
X-News-Reader: VMS NEWS 1.20

Does anyone know where I can get a cheap (< $50) power supply/sweep for 
a Mac Plus?  Thanks.

(Please respond via e-mail).

Greg C.
gfcardinale@ucdavis.edu
From: dominik@perm.geologie.uni-freiburg.de (Dominik Ulmer)
Newsgroups: comp.sys.mac.hardware
Subject: Laserprinter directly on ethernet ?
Date: 8 Oct 1992 14:38:27 +0100
Organization: "Geologisches Institut, Freiburg, Germany"
NNTP-Posting-Host: perm.geologie.uni-freiburg.de

Is it possible to attach a laser printer with a LocalTalk port directly
on a Ethernet cable with EtherTalk ? I imagine some little tiny box with
a ThinWire Ethernet connector on one side and a LocalTalk connector on the
other. Is there a manufactor of such a box and how much does it cost ?

 Dominik

-- 
Dominik Ulmer, Geologisches Institut, Albertstr.23-B
D-7800 Freiburg i.Br., FRG
Phone +49 761 203-2408   Fax +49 761 203-2463
e-mail: dominik@perm.geologie.uni-freiburg.de
Xref: sparky comp.sys.mac.hardware:19121 comp.sys.mac.misc:17846
From: Patrick.Stadelmann@info.unine.ch (Patrick Stadelmann)
Newsgroups: comp.sys.mac.hardware,comp.sys.mac.misc
Subject: Info on Apple new 14" monitor ?
Date: 16 Oct 92 15:08:58 GMT
Organization: University of Neuchatel, Switzerland

In article <1992Oct16.020322.10166@netcom.com>, bskendig@netcom.com (Brian Kendig) writes:

> 
> 14-inch Color Display: $589.  (640x480, swivel base, replaces current 13")

-- 

 Any info on this new monitor (picture quality) ? Is it a Trinitron ?

                 Patrick Stadelmann, Neuchatel, Switzerland                   
  e-mail : Patrick.Stadelmann@info.unine.ch                                   
   X-400 : C=CH;ADMD=ARCOM;PRMD=SWITCH;O=unine;OU=info;S=Stadelmann;G=Patrick
From: derrick@cs.athabascau.ca (Derrick Rowlandson)
Newsgroups: comp.sys.mac.hardware
Subject: Mac Classic II - good buy?
Date: 15 Oct 92 22:05:04 GMT
Distribution: comp
Organization: Athabasca University


Please excuse me if this has already been discussed, but a small local
outfit is pondering the purchase of a MAC CLASSIC II, to run a few
applications on (word processing, accounting,...). Is this machine a 
good choice, or is it on the verge of becoming obsolete? Do we expect Apple
to continue supporting this model with future OS releases? Are there
any other concerns about the purchase of this model over another MAC, or
even over a DOS machine for that matter?

Any advise and insight would be appreciatted.

thanks in advance

Derrick
From: ssbc+@andrew.cmu.edu (Samuel O. Swett)
Newsgroups: comp.sys.mac.hardware
Subject: Re: Failing Quantum 105S hard disks
Date: 14 Oct 92 21:06:05 GMT
Article-I.D.: andrew.werDkxG00UhW48iGxl
Organization: Freshman, H&SS general, Carnegie Mellon, Pittsburgh, PA


   Excuse me if this is inappropriate, but why don't you just un-stick
the drive.

There are two methods that I know of. Method 1: turn the drive on and
give it a good whack - maybe it'll start spinning. Method 2 (preferred):
pick up the drive, hold on tightly, and quickly rotate the whole box in
the same axis as the platters would spin.

Those methods worked for me for years....

-sam, who doesn't have a one-light-year-long signature
Newsgroups: comp.sys.mac.hardware
From: Quinn <quinn@cs.uwa.edu.au>
Subject: Re: Woz in apple ad?
X-Xxdate: Mon, 12 Oct 92 04: 31:47 GMT
Organization: The University of Western Australia
X-Useragent: Nuntius v1.1.1d11
Date: Mon, 12 Oct 1992 04:34:00 GMT

In article <1992Oct7.192207.12872@midway.uchicago.edu> JohnC,
jcav@quads.uchicago.edu writes:
>In article <1992Oct7.154112.8720@ncsu.edu> blaine@garfield.catt.ncsu.edu 
>(Greyland Blaine Mull) writes:
>>	I was just looking through some issues of MacWorld magazine and
>>I ran across an interesting Powerbook ad.  If you have access to the
>>July 92 issue (the one with the Quadra 950 on the cover) look at the
>>apple ad on page 88.  Is that Steve Wozniak (sp?) holding a powerbook? -
>>it sure looks like him!
>
>Yes, it's him.  Also, take a look at the text on the screen of the
PowerBook
>he's holding.  ;-) 

For the benefit of those of us who are never going to see US MacWorld
July '92 can you please tell us what it woz (-;

Quinn "The Eskimo!"      <quinn@cs.uwa.edu.au>     "Support HAVOC!"
Department of Computer Science, The University of Western Australia
From: bcanning@reed.edu (Benjamin Canning esq.)
Newsgroups: comp.sys.mac.hardware
Subject: Looking for advice on Mirror 14" monitor
Date: 9 Oct 92 16:41:38 GMT
Article-I.D.: reed.1992Oct9.164138.16381
Followup-To: comp.sys.mac.hardware
Organization: Reed College, Portland, OR

I am in the process of purchasing an LC II 4/80, and would like some
monitor advice. The Mirror 14' color monitor goes for $399, which is
the same as I'd pay for an Apple 12" here at school. I've had good
experience with Mirror hard drives, but I was wondering if anyone out
there has had experience with Mirror monitors, and could give me a
review of sorts. Replies through e-mail would be appreciated.
					Thanks,
						Ben Canning
-- 
Benjamin Canning 		|  
Philosophy/Religion Student     |  The mills of God grind slowly,
Reed College     		|  but they grind exceedingly small.
Portland, Oregon		|
Newsgroups: comp.sys.mac.hardware
From: dan@BofA.COM (Dan Brockman)
Subject: Fast gigabyte+ drive
Organization: Bank of America, Capital Products, RMTG #5906
Date: Sat, 17 Oct 92 00:35:46 GMT

What is the fastest gigabyte+ harddrive for mac?

What is the most reliable ?

What is the best tradeoff?

Please say, if you know, Manufacturer, model number,
approx price, caveats.  Thanks, gang.

-- 
 --------------------------------------------------------------
 Daniel Brockman             tel 415-953-0406, fax 415-622-2892
 Bank of America, Dept 5906, 555 Calif St
 San Francisco 94104 USA    email uunet!odinba!dan dan@BofA.COM
From: tomj@pnet16.cts.com (Tom Jenkins)
Newsgroups: comp.sys.mac.hardware
Subject: Going price for used Maxtor 212MB?
Date: 9 Oct 92 17:16:09 GMT
Organization: People-Net [pnet16], NCTAMS EASTPAC

So I was wondering, this fellow's selling one - what's the going price for a
five month old Maxtor?  Appears to be in good condition.

--Tom

UUCP: humu!nctams1!pnet16!tomj
ARPA: humu!nctams1!pnet16!tomj@nosc.mil
INET: tomj@pnet16.cts.com
From: gumby@ucsd.edu (Henry Ptasinski)
Newsgroups: comp.sys.mac.hardware
Subject: Hard disk partitions
Keywords: partition, Apple_Free
Date: 13 Oct 92 04:36:42 GMT

I was poking around the hard disk on my brother's SE the other day, and I came  
across a partition on the disk with the following description:

Title: 	Free Space
Partition Name:	Extra
Partition Type:	Apple_Free

I have since found this same partition on other Macintosh hard drives.

Why does this partition exist?
Is it used by anything?  If so, by what?  If not, can this partition be  
modified such that this space can be used?

Just curious.

Henry P.
gumby@ucsd.edu

P.S.  Anybody out there have a need for some used 256K (120ns, I think) SIMMs?
Xref: sparky comp.sys.mac.hardware:18694 comp.sys.mac.system:12659 comp.unix.aux:3722
From: barnett@grymoire.crd.ge.com (Bruce Barnett)
Newsgroups: comp.sys.mac.hardware,comp.sys.mac.system,comp.unix.aux
Subject: Which 3-button mouse to buy - Mouseman or A3 mouse?
Date: 9 Oct 92 11:05:13 GMT
Reply-To: barnett@crdgw1.ge.com
Organization: GE Corp. R & D, Schenectady, NY

My Mac mouse is dying, which gives me an excuse to buy a new mouse. I
want a 3-button mouse for A/UX, X Windows, system 6 + 7. Any advice?

Please send me e-mail as I am going on vacation next week.

I like the ergonomic look of the Mouseman (by Logitech). Is it
optical? The specs I have don't say. The other one I have seen is
the A3 Mouse by Mouse Systems, which is optical. (I like optical mice.
I have one at work on my workstation.)

I will probably set up the three buttons to do the following:
	Left - same as Mac button
	Middle - Shift+Mouse button
	Right - a keyboard sequence that will pop up a launching
		dialog, like Power Menus, DiskTop Launch, or a Tempo
		macro  which calls something special - perhaps being
		application specific.
Does this sound easy to do on any of these input devices? Any advice
is welcome. I'll post a summary/mail a summary if desired. Thanks.
	
--
Bruce Barnett <barnett@crd.ge.com> uunet!crdgw1!barnett
Newsgroups: comp.sys.mac.hardware
From: antkasx@gsusgi2.gsu.edu (Ken A. Sturrock)
Subject: Re: PDA's are flop
Organization: Georgia State University
Date: Fri, 9 Oct 1992 13:05:10 GMT

peirce@outpost.SF-Bay.org (Michael Peirce) writes:



>Personally, speech input seems to make more sense to me for this type
>of thing (PDAs) than for desktop computing......

"Mommy what's that guy talking to that box for?"

Actually, I guess it's no worse than people who talk to tape recorders ;).


						-ks
From: Hammond@biomail.sjsu.edu
Newsgroups: comp.sys.mac.hardware
Subject: Re: ** Hard drive in Classic II mounted UPSIDE-DOWN?!? **
Date: 12 Oct 92 19:14:24 GMT
Distribution: na
Organization: Biological Sciences, San Jose State University

In article <1992Oct8.190308.23662@microware.com> heilpern@microware.com (Mark
Heilpern) writes:
>
>NO NO NO! Hard drives link to run right side up, or on side, but DO NOT LET
>A HARD DRIVE RUN UPSIDE DOWN! YOU ARE RISKING GREAT DANGER!!!

I quote from the Quantum ProDrive 40S/80S/105S installation manual (rev A,
8/89), p 3-2:
"The drive may be mounted in any orientation and includes a mounting bracket
with integral shockmounts for this purpose."

Orientation probably was once a problem, but recent (post 1990) drives should
not have such restrictions.

John Hammond, netdude for:               |   "If you try sometimes,
  Biological Sciences                    |      I think you'll find
  San Jose State University              |         you get what you need."
Internet: hammond@biomail.sjsu.edu       |
Newsgroups: comp.sys.mac.hardware
From: edwards@andy.bgsu.edu (Bruce Edwards)
Subject: Re: Woz in apple ad?
Organization: Bowling Green State University B.G., Oh.
Date: Thu, 15 Oct 1992 13:20:44 GMT

In article <1822@eagle.ukc.ac.uk>, dl1@ukc.ac.uk (D.Langford) writes:
---
> I can't let this go without adding my 5c worth. I actually met 
> the Woz some years back, when he was visiting the UK's major
> Mac show. (He's not too tall, is he?)
> 
> Anyway, having used Apple since the original Apple ][, I was 
> kinda overcome at bumping into someone I'd always assumed was
> a marketing invention designed to promote the American Dream
> (see above)... so I knew I just had to get some objective proof
> that he really existed.
> 
> An autograph would've been fine, but do /you/ take an autograph book
> to a computer show? And I don't even own an autograph book...
> 
> 
> But I do have an autographed copy of an apple price list.
> 
> - duncan

Thought you might get a kick out of a similar 'autograph' related story.
In November of 1983 I got inspired one day and wrote Steve Jobs what I
suppose you'd call a 'letter of encouragement' concerning Apple and what
a difference its products and approach to business had made in my life
(I don't normally write fan mail to computer manufacturers but as I think
back I think I also was doing a contract programming job on a IBMPC at
this time ... nuff said).  Anyway I ended the letter with a P.S. Why don't
you send me an autographed integrated circuit or something and I'll hang
it on my wall. I really wasn't serious, just a funny way to sign off. Well
shortly there after I received the following;
----------------------------

Dear Mr. Jenkins:

Thanks for letting us know of your support.  It's really great to know
that our fans up in the bleachers are cheering for us.

Keep the faith!

Sincerely,


Steven P. Jobs
Chairman
Board of Directors

PS: Hope you enjoy the chip -- an Applesoft ROM

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

under the 'Sincerely' where there would normally be a signature a
long arrow was drawn to the bottom of the page where stuck in the
paper was a 24-pin dip IC with a white label stuck on it signed
steve jobs.

I thought it was a mondo cool thing for him to do at the time and
still do.  It's hangin on my office wall along with a ball signed
by Bob Feller Cleveland hall-of-famer.

edwards@andy.bgsu.edu
-- 

edwards@andy.bgsu.edu
From: kurtzman@pollux.usc.edu (Stephen Kurtzman)
Newsgroups: comp.sys.mac.hardware
Subject: Re: Woz in apple ad?
Date: 10 Oct 1992 22:34:01 -0700
Organization: University of Southern California, Los Angeles, CA
NNTP-Posting-Host: pollux.usc.edu

In article <1b7bohINN9od@usenet.INS.CWRU.Edu>
an780@cleveland.Freenet.Edu (Travis Grundke) writes:

> Yes, Woz is the man who co-founded Apple...if it weren't for him, there
>would be no Apple. At the time (and I tihnk he still is), he was one of
>the best computer engineers of all time.

Wow, that's some praise. But, I can think of quite a few people I'd
place before him. For starters, how about Bell, Amdahl, and Cray. ...
(This is sure to be a flame-free topic :).

>His way of designing products was phenominal- he'd take a 30 chip
>computer costing $1000 to make and he'd be ablt to cut it to 10 chips
>and produce them at a cost of about $60 each.

Yes, I've heard a story from an ex-Apple engineer who said the process
was to stare at a design and try to figure out how to eliminate chips
by reusing function from other chips in the design and pushing things
into software. Of course, this engineer worked on I/O software, so he
did not have nearly as high a regard for the process as Travis. Every
programmer who has had to write low-level software is familiar with
the hardware engineer's refrain: "Leave that $0.50 chip out of the
design; they can write software to work around the loss of function."

>That's more or less the way he did the Apple I, and then
>the Apple II. And yes, the chip is still being used on current Macs,
>most popularly referred to as the "SWIM" chip for disk drive control.

Is this the floppy disk controller? If it is, then I don't think you
can use the word "popular". From what I've been told, due to the
limited function offered by this chip, the whole darn CPU is
essentially turned into a floppy disk controller. This is not an
efficient use of a 68030 or 68040. (It may have been seen as a good
trade off at the time, but times have changed.)
-- 

Stephen Kurtzman             | "where desire writhed there stands a stone;
kurtzman@pollux.usc.edu      |  the change was sudden and complete"
                             |                              -- Maggie Roche
Newsgroups: comp.sys.mac.hardware