HDTenEightyP/NetNews huggingface dataset:
From: cljackso@essex.ecn.uoknor.edu (Chris L Jackson)
Newsgroups: comp.sys.next.hardware
Subject: Networking
Keywords: Mac/Next
Date: 18 Nov 92 00:36:03 GMT
Article-I.D.: constell.Bxvz07.I06
Organization: Engineering Computer Network, University of Oklahoma, Norman, OK, USA

I'm not sure if this is the right place to post this, but here it goes anyway.
 
I am tring to network a NeXT 040 cube with a Macintosh Quadra 950..  I need to
know how to do the local configuration in the NetMgr, basically, I have no idea
what I am doing..  I have the 14 pin connector/transciever for the quadra, it's
got the thin coax cable connector running to the Next..

As for the Mac, I need to know if I will need additional software, if so what.. If not, How do I configure what I have???  I downloaded the software NCSA/BYU   Telnet 2.5..  All help would be great.










__________________________________________________________
clj@okcforum.uoknor.edu or cljackso@essex.ecn.uoknor.edu
(405)755-7622 
__________________________________________________________
Newsgroups: comp.sys.next.hardware,uiuc.sys.next
From: lemson@ux1.cso.uiuc.edu (David Lemson)
Subject: Re: Toshiba 1.2GByte hard drive, what to look out for?
Keywords: Toshiba MK538FB, Mac drive on a NeXT, drivers
Organization: University of Illinois at Urbana
Date: Thu, 19 Nov 1992 23:22:43 GMT

heller@heller.slip.uiuc.edu (Helmut Heller) writes:

>Hello,
>I just ordered (but don't have yet) a Toshiba 1.2GB hard drive (external) for  
>my NeXTstation turbo. The place I ordered from is a Mac vendor and does not  
>know about NeXTs. He said I would need drivers for the Next to drive the  
>drive, which he can not supply.

>Has anyone successfully (or not?) mounted such a drive on a NeXT?
>If so, do I need special drivers and where do I get those from?
>Anything to watch out for?
>Any general tips/recommendations?

If the drive is a fairly modern SCSI drive, and has what's called
SCSI auto-sense, then it should work with NeXTs.  You don't need any
special drivers or anything, you simply hook it up and the machine
will prompt you with 'Unreadable disk.  Initalize?'  The auto-sense
circuitry built into the drive will return all of the disk
parameters to the machine so that it can format it properly.

I have hooked up various Fujitsu, Maxtor, and Seagate drives up to
NeXTs.  It's basically plug and play with the proper cable (you need
a SCSI-II cable end on the NeXTStation side.

A general tip - you will want to add the drive to the /etc/fstab
file on your NeXT so that it is mounted automatically.  The
/etc/fstab should look like: 

#
# Your original drive
/dev/sd0a / 4.3 rw,noquota,noauto 0 1
# Your second drive
/dev/sd1a /External_Disk 4.3 rw,noquota 0 2

Note the absence of the 'noauto' flag on the second drive!  That is
very important.

If you do not add it to /etc/fstab, then the automounter will take
over and mount it just like a floppy that you install - that is, the
external drive will be owned by the person logging into the console,
and will not be mounted unless someone is logged into the console.
-- 
David Lemson                                                (217) 244-1205
University of Illinois NeXT Campus Consultant / CCSO NeXT Lab System Admin
Internet : lemson@uiuc.edu                UUCP :...!uiucuxc!uiucux1!lemson 
NeXTMail accepted                                  BITNET : LEMSON@UIUCVMD
Newsgroups: comp.sys.isis
From: ken@cs.cornell.edu (Ken Birman)
Subject: Availability of V3.0.7 patch release
Organization: Cornell Univ. CS Dept, Ithaca NY 14853
Date: Thu, 19 Nov 1992 15:56:44 GMT

The V3.0.7 patch release we have mentioned is now available for those
who need it.  It will be sent out automatically for new Isis orders 
(including academic ones) but if you already have V3.0.7 it won't be
sent to you unless you request it.

This patch is exactly the same as V3.0.7 but with some minor problems
corrected, all of which turned up after V3.0.7 went out:
   - Slow performance with overlapped groups using the "x" option
   - Slow performance on some platforms that disable TCP_NODELAY by default
     on creation of TCP connections.
   - Tendency to hang when extremely rapid sequences of pg_leave/pg_join
     or pg_delete/pg_join are done.
   - Performance problems seen with the spooler because of 
        * it not using bypass communication, and
        * lack of appropriate flow-control mechanisms
     These matter mostly to people doing wide-area communication directly
     over the wide-area subsystem or through the WAN news interfaces

V3.0.8 will be a genuinely new release, and when it comes out there will
be a substantial performance improvement in the WAN mechanisms and spooler,
as well as heavy use of IP multicast (when available from the vendor) all
through ISIS, and the ability to connect to ISIS from a Macintosh on Mac OS,
from a PC, and perhaps from NT.  Availability of V3.0.8 is planned for
very early in 1993 -- mid to late January.

Email to sla@isis.com if you need to get the V3.0.7 patch release and
are not sure that it will be sent out to you automatically.
-- 
Kenneth P. Birman                              E-mail:  ken@cs.cornell.edu
4105 Upson Hall, Dept. of Computer Science     TEL:     607 255-9199 (office)
Cornell University Ithaca, NY 14853 (USA)      FAX:     607 255-4428
Newsgroups: comp.sys.isis
From: ken@cs.cornell.edu (Ken Birman)
Subject: Re: A distributed computing group
Organization: Cornell Univ. CS Dept, Ithaca NY 14853
Date: Mon, 16 Nov 1992 13:25:23 GMT

In article <1992Nov13.141154.2785@cs.cornell.edu> ken@cs.cornell.edu (Ken Birman) writes:
>I am not aware of Blanca, but would be interested in learning more.

As a result of this comment, I received some information on Blanca:
    From wiltzius@anduin.ocf.llnl.gov Sun Nov 15 23:04:26 1992
    Date: Sun, 15 Nov 92 20:04:10 PST
    From: wiltzius@anduin.ocf.llnl.gov (Dave Wiltzius)
    To: ken@cs.cornell.edu
    Subject: Re: A distributed computing group
    Newsgroups: comp.sys.isis
    Organization: Lawrence Livermore Nat'l Lab.

    You mentioned in a recent posting that you were not aware of
    Blanca.  Briefly, since I suspect you may get several replies,
    the Blanca I am aware of involves NCSA, LBL (Berkeley) and several
    commercial interests in a high-speed wide-area network utilizing a
    form of ATM.  Blanca is one of 5 such high-speed network testbeds
    sponsored by NREN (National Research and Educational somesuch?);
    some of the others are Casa and Aurora.

    It perhaps involves distributed computing but each testbed has
    some unique aspect for research but all, I believe, are to develop
    and test applications that run on the high-speed network with
    resources distributed over the network.

    LLNL has just recently been connected to Blanca.  There is a
    *lot* more information available on these NREN testbeds.
      Dave Wiltzius
      LLNL
      wiltzius@llnl.gov

-- 
Kenneth P. Birman                              E-mail:  ken@cs.cornell.edu
4105 Upson Hall, Dept. of Computer Science     TEL:     607 255-9199 (office)
Cornell University Ithaca, NY 14853 (USA)      FAX:     607 255-4428
Newsgroups: comp.sys.isis
From: rcbc@seth.cs.cornell.edu (Robert Cooper)
Subject: Re: A distributed computing group
Reply-To: rcbc@cs.cornell.edu
Organization: Cornell Univ. CS Dept, Ithaca NY 14853
	<1992Nov13.141154.2785@cs.cornell.edu>
Date: Mon, 16 Nov 1992 18:48:49 GMT

In article <Peter.Eggan-121192143125@buckyball.aero.org> Peter.Eggan@aero.org (Dr. Peter C. Eggan) writes:

>Is there a news group dedicated to distributed computing in general, rather
>than just isis?  From just looking at group names, it doesn't appear as
>though that area has a dedicated group.  Is there any interest in one?

In addition to comp.os.research there is comp.client-server. 
comp.client-server discusses the "client server approach to distributed
computing". Actually everybody on the group seems to have a different
definition of client-server, but there have been some interesting
discussions of synchronous versus asynchronous communication on there. 

Are there any other groups where distributed computing comes up?

        -- Robert Cooper
--
-- 
Newsgroups: comp.sys.isis
From: rcbc@virgo.cs.cornell.edu (Robert Cooper)
Subject: Academic release V2.2.7 of Isis available
Reply-To: rcbc@cs.cornell.edu
Organization: Cornell Univ. CS Dept, Ithaca NY 14853
Date: Thu, 19 Nov 1992 18:51:28 GMT

The new academic release of Isis is (finally) available. We apologize for
the delays in getting the latest version of this out. All those who
requested V2.2.6 and V2.2.7 should be receiving their tapes in the next
week. The academic release is available to educational institutions only---
degree granting institutions that teach students. E.g. for teaching a
course on distributed programming. The cost is $US 500 for a LAN license,
and upgrades cost $50 each. (This is a huge saving over the equivalent
commercial prices for Isis, and includes the Distributed Resource Manager
and Isis News.)

The academic release has changed in format and now includes one
machine independent tar file and 6 machine dependent tar files on the same
tape. This avoids the need for huge amounts of disk space to read the whole
tape if you just need binaries for one system. The machines supported are:

  SUN4:  Sun4 running SunOS.
  SUN3:  Sun3 running SunOS.
  HPUX:  HP9000 series 700 (snakes) running HP-UX.
  AIXRS: IBM RISC-System/6000 running AIX.
  MIPS:  DECStation running Ultrix. 
  NEXT:  NextStation running Next/Mach.

              -- Robert Cooper, Isis Distributed Systems, Inc.
--
-- 
Newsgroups: comp.sys.isis
From: cliff@cs.cornell.edu (Cliff Krumvieda)
Subject: ISIS, Smalltalk, CLOS
Organization: Cornell Univ. CS Dept, Ithaca NY 14853
Date: Mon, 23 Nov 1992 16:24:52 GMT

>Has anyone out there tried to integrate the ISIS toolkit with
>Smalltalk or CLOS?

>I think Cliff will be posting something on Isis within CLOS environments.
>He developed the commercial version of our Common LISP interface, which looks
>much better than the V2.1 version (and is faster too), so he's the expert
>on this.

The Common LISP Interface to Isis 3.0.7 uses the Object System to
"wrap" objects communicated between Lisp and C.  For instance, a
pointer to a C groupview structure is represented by an instance of
the <GROUPVIEW> class in LISP.  A simple single inheritance scheme is
used to group objects that behave the same; e.g., the superclass
<ADDRESS> has subclasses <GROUP-ADDRESS>, <PROCESS-ADDRESS>, and
<PROCESS-LIST>, and any <ADDRESS> can be the destination of a bcast.

Unlike the Smalltalk port (as I understand it), the Common LISP
Interface is not intended as a thorough integration of Isis into an
object-oriented paradigm.  Instead, it provides a safe, efficient, and
convenient way to use the Toolkit from either Lucid or Allegro Common
Lisp.

							--Cliff
Newsgroups: comp.sys.isis
From: wright@hsi.com (Gary Wright)
Subject: ISIS, Smalltalk, CLOS
Organization: 3M Health Information Systems, Wallingford CT
Date: Fri, 20 Nov 1992 20:52:58 GMT


Has anyone out there tried to integrate the ISIS toolkit with
Smalltalk or CLOS?
-- 
Gary Wright                                                 ...!uunet!hsi!wright
3M Health Information Systems                                     wright@hsi.com
Newsgroups: comp.sys.isis
From: ken@cs.cornell.edu (Ken Birman)
Subject: Re: ISIS, Smalltalk, CLOS
Organization: Cornell Univ. CS Dept, Ithaca NY 14853
Date: Sat, 21 Nov 1992 16:14:36 GMT

In article <By18oA.DAC@hsi.com> wright@hsi.com (Gary Wright) writes:
>
>Has anyone out there tried to integrate the ISIS toolkit with
>Smalltalk or CLOS?

I think Cliff will be posting something on Isis within CLOS environments.
He developed the commercial version of our Common LISP interface, which looks
much better than the V2.1 version (and is faster too), so he's the expert
on this.

As for Smalltalk, we have an activity now that will produce a smalltalk
distributed computing environment that presents most Isis functions in
terms of object inheritence.  We expect to announce the product arund
the end of the year, but preliminary information is available from Rick
Moran, who heads our New York office.

I personally am really excited about this direction for the technology --
we are trying to go well beyond just providing interfaces for Isis from
Smalltalk, and we see this as an activity that will lead to a collection
of object-oriented reliability tools from our effort.  Beyond Smalltalk,
we plan to focus on the CORBA spec. and C++, starting this early in 1993.
Again, Rick Moran would be the person to contact for information about
early access.

Rick should get email as moran@isis.com starting soon, but until our mailer
is working properly (it is currently being reconfigured and may not work
at all), email to Rick via sla@isis.com

-- 
Kenneth P. Birman                              E-mail:  ken@cs.cornell.edu
4105 Upson Hall, Dept. of Computer Science     TEL:     607 255-9199 (office)
Cornell University Ithaca, NY 14853 (USA)      FAX:     607 255-4428
From: 90taobri@CHASM.SCAR.UTORONTO.CA (Brian Tao)
Newsgroups: comp.sys.apple2
Subject: Re: Symbolix 1.7 demo - read me
Date: 18 Nov 92 06:17:31 GMT
Distribution: world
Organization: University of Toronto (Scarborough) Computing Services

The following revelation escaped gudat henrik's lips:
>
> Some notes regarding the (G)Symbolix demo on comp.binaries
>
> Larry has just uploaded the demo of the new version on
> comp.binaries.apple2. Thanks mucho, Larry!

    Yeah, GSymbolix 1.7 has an ultra-cool "About" box.  :)  Are *all*
trig and scientific functions disabled in the demo?  Even a simple
formula like SIN(x+y) generates an error and the 'S' is highlighted?
I'd like to demo it to the user group, but I can't seem to do anything
even minutely useful with it.  Maybe if you add some background music to
the About box, I'll be happy... ;-)
--
-=+ Brian Tao (taob@r-node.pci.on.ca, 90taobri@chasm.scar.utoronto.ca) +=-
                                   -=+=-
     -=+ MuGS: The Only Internet Mail Reader For The Apple IIGS! +=-

Newsgroups: comp.sys.apple2
From: mallen@casbah.acns.nwu.edu (Mark Allen)
Subject: Re: SEAs?
Organization: Northwestern University, Evanston Illinois.
Date: Mon, 16 Nov 1992 19:15:27 GMT

In article <92321.123328TS8RBOTW@MIAMIU.BITNET> Radagast <TS8RBOTW@MIAMIU.BITNET> writes:
>Why are Sefl-Extracting Archives (particularly GSHK) called self-
>extracting when they don't?  That's annoying having to change the
>file type and aux type like we have to do with GSHK.  Is GSHK the
>only SEA like that, or do all have to be manipulated?  GSHK is the
>only SEA I've ever seen.
> 
>Just curious...
>   ...Tim

I downloaded my copy of GSHK 1.1 from GEnie.  All I had to do was double click
on it and viola!  A new copy of GSHK 1.1, no hassles, no mess. I believe the
copy that U/L on the NET was corrupted or something.  But the SEA I got worked
fine.
 
--Mark

--

*****************************************************************************
*  Mark Allen   Northwestern Univ * "This death star is now the ultimate    *
*  M_ALLEN@NUACC (Bitnet)         *  power in the universe." & "The power   *
*  mallen@casbah.acns.nwu.edu     *  to destroy a planet is insignificant   *
*  GEnie:  M.ALLEN15              *  compared with power of the Force."     *
*****************************************************************************
From: cd866@cleveland.Freenet.Edu (Marc Sira)
Newsgroups: comp.sys.apple2
Subject: Re: Out of This World - Out of My Mind
Date: 18 Nov 1992 04:48:39 GMT
Organization: Case Western Reserve University, Cleveland, OH (USA)
Reply-To: cd866@cleveland.Freenet.Edu (Marc Sira)
NNTP-Posting-Host: hela.ins.cwru.edu


In a previous article, joko@well.sf.ca.us (Joe Kohn) says:

>
>Admittedly, playing OOTW takes some getting used to, but after you've
>figured out what kinds of things you need to do to clear a level, it gets
>less frustrating. So, if you want to clear the first level...

[total spoiler dd'd]

>BTW, on the GO GAMERS forum on CompuServe, there's a complete walk through.
>It's nearly 20 pages when printed out. I personally feel it's way to soon to
>start spreading that around, but, maybe in a couple of months...

Um, exactly...perhaps when giving hints like the deleted one above, it
might be wise to use the
(Spoiler follows!)


(Aw, you peeked...)
approach? B-)


-- 
                                      30
Newsgroups: comp.sys.apple2
From: cranem@edsi.plexus.COM (Mike Crane)
Subject: Re: Genie Gateway charges?
Organization: Enterprise Data Systems Incorporated, Appleton WI
Date: Sun, 22 Nov 1992 16:39:19 GMT

flash@pro-applejacks.cts.com (Glenn Koproske) writes:
>KCR103@psuvm.psu.edu writes:
>>Does the Genie person get charged upon receipt or sending of mail or both?
>According to GEnie LIVEWIRE:
>A subscription costs $9.95 per month.  Incoming mail is included, while
>outgoing mail is charged to your GEnie account at only $.40 per message.

This has been changed to a much more reasonable rate.  They (GEnie) are
now charging a one-time $2.00 sign-up fee and $.30 per 5000 bytes
transferred (incoming and outgoing).
-- 
Mike Crane           Bang: uunet.uu.net!edsi.plexus.COM!cranem@uunet.UU.NET
Internet: cranem@edsi.plexus.com | Michael_Crane@ntc.com | mike566@aol.com
GEnie: M.CRANE   AOL: MIKE566      "Who needs drugs...we've got UNIX!" - Me
      (Internet addresses are listed in order of preference of use.)
Newsgroups: comp.sys.apple2
From: 93jay@williams.edu (Jonathan Young)
Subject: Apple IIe modems
Organization: Williams College, Williamstown, MA
Date: Thu, 19 Nov 1992 03:30:34 GMT


Failing that, can anyone recommend a good place to get a serial card
for cheap? Also I believe he said his software didn't support 2400
baud operation. Is there an FTP site or something where I could get
some PD terminal software? Kermit and or xmodem would be fine, VT100
nothing fancy.


I know little about the current state of the Apple2 world having moved
from my dreaded Franklin Ace 1000 (what a dog) many years ago.

Post or email to
	Jonathan.A.Young@williams.edu

Newsgroups: comp.sys.apple2
From: joko@well.sf.ca.us (Joe Kohn)
Subject: Re: A+/InCider article: ACK!
Organization: Whole Earth 'Lectronic Link
Date: Tue, 17 Nov 1992 16:01:38 GMT


Well, if you want a read an article in inCider/A+ about System 6, written by
one who is in awe of all that System 6 can do, you'll just have to wait one
more month. In the January, 1993 issue, there will be a feature length
article called "Way Cool System 6".

I don't think anyone reading this newsgroup will be complaining after
reading that article. In fact, you might even learn something about System 6
that you didn't know about.

Joe Kohn
Newsgroups: comp.sys.apple2
From: jimwong@owlnet.rice.edu (Jim Wong)
Subject: Re: how do I delete file comments?
Organization: Rice University
Date: Fri, 20 Nov 1992 08:58:24 GMT

In article <m0ms6X0-0000oAC@crash.cts.com> sbennett@gnh-starport.cts.com (Stephen Bennett) writes:
>
>Well, if you used Copy II+, you should have solved the problem.  If I remember
>correctly, Copy II+ does a number of things in ways against the rules, and one
>of them causes it to completely ignore the resource fork of files, so using
>Copy II+ should have stripped the resource fork (with the comment in) off the
>file.
>

In my experience, Copy II+ has trashed extended files rather than copying
them sans resource fork.  I wrote a small application that made a copy
of a file, ignoring the resource fork -- it's really easy.


-- 
Jim Wong (jimwong@owlnet.rice.edu)
From: 90taobri@CHASM.SCAR.UTORONTO.CA (TAO  BRIAN T)
Newsgroups: comp.sys.apple2
Subject: Re: Editors
Date: 16 Nov 92 03:48:11 GMT
Distribution: world
Organization: University of Toronto (Scarborough) Computing Services

The following revelation escaped Robert Mueller's lips:
> 
> Microemacs is quite nice, but it's so SLOW loading files!!
> I don't want to wait years just to load my asm source.

    How big are your source files?!?  uemacs is on the slow side when
loading files compared to other editors, but it isn't *that* slow.  It
has so many other features that make up for this one shortcoming.  Like
being able to turn it into a mail reader, for instance.  ;-)
--
-=+ Brian Tao (taob@r-node.pci.on.ca, 90taobri@chasm.scar.utoronto.ca) +=-
                                   -=+=-
     -=+ MuGS: The Only Internet Mail Reader For The Apple IIGS! +=-
From: aa783@cleveland.Freenet.Edu (Mark Spaeth)
Newsgroups: comp.sys.apple2
Subject: Re: How do I control soft switches?
Date: 17 Nov 1992 22:18:16 GMT
Organization: Case Western Reserve University, Cleveland, OH (USA)
Reply-To: aa783@cleveland.Freenet.Edu (Mark Spaeth)
NNTP-Posting-Host: hela.ins.cwru.edu


In a previous article, hiroki@limerick.cbs.umn.edu (Hiroki Morizono) says:

>
>Hi, I'm trying to open/close a switch using  a solid state relay, from
>the game port of an apple2e, using game controller 0
>(there is this piece of lab equipment that needs to be turned on and off at 
>20 second intervals)
>
>
>The program looks something like this:
>
>10 INPUT "on interval"; A
>20 INPUT "off interval"; B
>30 INPUT "repeats "; C
>40 FOR L = 1 to C
>50 POKE -16295,253   
>60 FOR O = 1 TO A : NEXT O
>70 POKE -16296, 0    
>80 FOR F = 1 TO B : NEXT F
>90 NEXT L
>
>-16295, -16296 are supposed to turn the game control output  on and off,
>
>So before doing anything, I decided to just put wires in pins 5 and 3,
>Game control 0, and ground , and hook em up to a multitester. Got no changes 
>when I ran the thing. (I used long intervals--100, 300 etc) 
>Pin 2 (+5V) and Pin 3 (Gnd) gives me back 5v, so it isn't a loose connection. 
>
>How do I turn on and off the soft switches? 
>
>Am I right in assuming that once TTL is set high, it stays high, or do I 
>need to enclose the "switch on" magic woid/line between my FOR-NEXT statements?
>
>What am I doing wrong (besides poking at the brains of my computer)?
>(I don't need a nice program for now, just one that does the job)
>
>Email would be very gratefully appreciated,
>Thanks in advance,
>Hiroki Morizono
>hiroki@limerick.cbs.umn.edu (Machine is supposed to be taken off line tonight)
>mori0009@student.tc.umn.edu (Might be a better place to try.)
>
>

seems to be taht you proble is that you're not you're turning off and on
the annuciators which aren't accessed thru the game port on the back of he
computer... they're accessed on the 16 pin (?) little game port on the
motherboard...
Newsgroups: comp.sys.apple2
From: achauhan@warsaw.math.macalstr.edu (Amrit Chauhan)
Subject: Re: ATTENTION high-speed modem users!
Organization: Iowa State University, Ames IA
Date: Mon, 16 Nov 1992 17:01:57 GMT

Tc Wilson writes
> mdavis@crash.cts.com (Morgan Davis) writes:

> > This may be because the IIGS firmware uses the CTS transition interrupt
> > rather than polling the CTS signal as do many programs that go right
> > to the metal in dealing with the 8530 directly.

> Yes, but you have to remember that the firmware cannot handle anthing 
> above 19200 (38400 or 57600 for the newer modems), and even then, at 
> 19200, the firmware's throughput is very low (more like 11000 baud).

Well, Morgan was looking for security (if I may speak for the guy :) and  
dealing directly with teh 8530 can lead to serious problems...it must have been  
tough enough to deal with ProDOS 8 and having to support the //e...I mean look  
at what Morgan had to work with!  Although, initially, I was not happy with the  
lower throughput, it was a drastic improvement on what we once had for ProLine  
and I can't fault Morgan for "doing the right thing"(tm) - as you can see, CTS  
integrity has been compromised by dealing directly w/ the 8530 -- the question  
still remains, however, whether or not the problem can be corrected while still  
dealing directly with the chip.

> Tc Wilson/The Captain           "Programming is an art form
> t.captain@bluemoon.rn.com        that fights back."
> ..... or try: TCQ, The Captain's Quarters (614) 488-8401, 300-38400 hst

--
< >  +++++++++++++++++++++++++++++  < >
<++> Amrit Chauhan		   <++>
<++> achauhan@math.macalstr.edu    <++>
< >  +++++++++++++++++++++++++++++  < >



Newsgroups: comp.sys.apple2