HDTenEightyP/NetNews huggingface dataset:
From: mo@sdf.lonestar.org (Mohit Goyal)
Subject: 72Hz video signal to a 60Hz monitor, What Happens?
Organization: sdf Public Access UNIX, Dallas--unrestricted free shell access
Date: Wed, 22 Jul 1992 01:36:09 GMT

Hello.  I have a VESA compatible video card.

It is a Diamond Flower.  It has 1 meg on it.

Anyways, it can do all the normal and VESA frequencies.

My monitor is a ViewSonic 4.

It is a multisync monitor capable of doing 800X600 with a
vertical scan rate of 56Hz and horizontal scan of 35kHz.

It can also do 1024X768 interlaced.
vertical scan = 87Hz, horizontal scan = 35kHz

Here's the problem;
If I try to display anything at 800X600, the screen gets
out of sync.  The picture doesn't disappear, the screen just
gets out of sync. 
I can view VGA and 1024X768 images just fine, in fact, I can
switch from a VGA to 800X600 to 1024X768 image just fine, except
that when I try to display the 800X600 image the screen goes out
of sync.  It gets back in sync as soon as I display something in
VGA or 1024X768.

I don't think it is the monitor because just a week ago it would
display all resolutions fine using a STB Powergraph.  The STB
Powergraph is not a VESA compatible card.

I think that the video card is sending a 72hz signal at 800X600
instead of a 60hz one.  Is this the problem?  Does anyone know
how I can fix this problem?  Thanks.

Newsgroups: comp.sys.ibm.pc.hardware
From: moe@rainier.lib.washington.edu (Joe Shippert)
Subject: Null modem cable???
Organization: University of Washington Libraries, Seattle
Distribution: na
Date: Thu, 30 Jul 1992 21:28:29 GMT


I'm trying to make a null modem cable and I have no idea what one is. Any 
hints? Thanks,

joe
-- 
_______________________________________________________________________________
moe@u.washington.edu
ad Kalendas Graecas
From: lon@edsi.plexus.COM (Lon Ponschock)
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Has anyone shopped for:Bernoulli PC Powered Pro 90 lately?
Summary: Request direct mail price info on new Bernoulli PC Pro 90
Keywords: Bernoulli,price info
Date: 24 Jul 92 02:17:05 GMT
Article-I.D.: edsi.1992Jul24.021705.4538
Organization: Enterprise Data Systems Incorporated, Appleton WI


Has anyone shopped for a Bernoulli PC Powered Pro yet?
Best price I have seen is $ 599.00 from PC Connection.
Please specify if the boot card is included.
Thanks
-- 
   Question Recently
   Posed to the Net:'Kukla, Fran & Ollie' which one is which?
   Answer: Tom Servo is Kukla, Crooow is Ollie and Joel is Fran.
   lon@edsi.plexus.com
Newsgroups: comp.sys.ibm.pc.hardware,comp.sys.ibm.pc.misc
From: mac1@Ra.MsState.Edu (Mubashir Cheema)
Subject: THE BEST FTP SITE  ??????????????
Summary: ftp_site
Keywords: FTP_SITE
Organization: Mississippi State University
Date: Sun, 26 Jul 1992 08:30:47 GMT


Hello World,

  Which is the best ftp site for PC freeware & shareware ?
  I hope alot of other users would like your opinion as well.

  Thanx in advance.

Mubashir.

Newsgroups: comp.sys.ibm.pc.hardware
From: jorgej@colossus.cs.rpi.edu (Joaquim Jorge)
Subject: Micronics address
Organization: Rensselaer Polytechnic Institute Computer Science, Troy NY
Distribution: usa
Date: Wed, 29 Jul 1992 14:48:28 GMT

Hi:

Could somedy please post the address/telephone for Micronics ? They do not
seem to have an 800-number listed.

Thanks In Advance

--
Joaquim Jorge
======================================================================
Rensselaer Polytechnic Institute  | E-mail: jorgej@cs.rpi.edu 
C.S. Department                   | Phone:  (518) 276 4849
RPI,Troy, NY 12180		  | Home:   (518) 273 4415
======================================================================
From: Tim_-_Otholt@cup.portal.com
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Re: fax modems
Date: Wed, 29 Jul 92 02:14:32 PDT
Organization: The Portal System (TM)

Posted:

>7/28/92 15:27 20/1038 dfh@dwroll.att.com (D461-David_F_Haertig(Dave)83040)
>Lines 1 to 13 of 20 (65%)   
>----- 
>From article <seah.712297313@sfu.ca>, by seah@fraser.sfu.ca (Simon Seah):
>> I was told that only a few fax modems actually work.  I can remember
>> which ones work, though. Sorry. 
>> I do, however, know that Zoltrix DOESN'T.  I got one, trashed about it
>> for a few months, and was finally told by a knowledgeable friend that
>> it just plain doesn't work as a fax.  As a modem, yes.  Fax, no.
> 
>I have one by C.P.I. (Computer Peripherals, Inc.???) and it has worked
>flawlessly.  It's only a 2400 baud modem though.  I think the model
>designation is "VIVA 2496ef" or something like that.  It's an external

I have the same modem (Computer Peripherals Inc., 2400/9600 Fax with V.42
and MNP 5.  No WinFax software, but I got some DOS based FAX software
instead.  And I got it for $130 with shipping, from Computer Discount
Warehouse (CDW).  I love it and the price.

Aloha,

Tim Otholt
tim_otholt@cup.portal.com
(408) 894-4290
Milpitas, CA



don't have any higher speed places you normally dial into - so it's just
fine.  The fax part works perfectly, both send and receive.

Price?  $149 at Best Buy.  (Probably even cheaper now - I've never seen
anybody bounce prices around as much as these guys do!)

Dave Haertig
haertig@att.com
Xref: sparky comp.sys.ibm.pc.hardware:20371 comp.periphs.scsi:3740
From: chad@eng.umd.edu (R Michael McMahon)
Newsgroups: comp.sys.ibm.pc.hardware,comp.periphs.scsi
Subject: Re: Problems installing a second SCSI drive with ST-02
Keywords: SCSI, Seagate ST-02
Date: 27 Jul 92 13:27:57 GMT
Reply-To: chad@eng.umd.edu (R Michael McMahon)
Organization: College of Engineering, Maryversity of Uniland, College Park

In article <1992Jul25.002528.22672@leland.Stanford.EDU>, jbradfor@leland.Stanford.EDU (Jeffrey Bradford) writes:
> In article <1992Jul24.070211.854@nntp.hut.fi> ski@niksula.hut.fi (Sami Kivilaakso) writes:
> >
> >	I'm having problems with installing a second physical
> >	SCSI disk drive. My system is currently the following:
> >		386/25, AMI BIOS
> >		Seagate ST-02 controller + ST296N SCSI drive
> >					 + 5.25" + 3.5"
> >
> >	I've been trying to add a second SCSI drive without succes...
> 
> Last year when I was installing my second hard disk, I had the
> *exact* same setup and the *exact* same problem.  Sorry to say, the
> only solution I found was to buy a new SCSI card.  You were right:
> from what I was told, the ST-02 will only work with Seagate drives.
> Do yourself a favor: burn the ST-02 and buy a *real* SCSI card :-}
> 
> I finally got mine working when I bought an old Future Domain card.
> The only problem with it is that it requires a driver to use more than
> one HD.  (sstor.sys worked for me.)  I'm not using the Future Domain
> card any more, so if you can't afford a real controller card I'll give
> you my old one for the cost of postage to Finland...
> 
> Jeffrey Bradford

No Jeff, the ST-02 works with non-Seagate drives. I once had (pre-1542 days) 
a Seagate ST-02 working with an ST296N and a Quantum 105S. I suspect an 
address/parity/terminator problem with Sami's setup. Double check that the
drives and host all have different SCSI addresses, all share the same parity
setting, and that (only) the LAST drive on the SCSI bus (cable) is terminated.


R Michael McMahon	chad@src.umd.edu
From: grouleff@daimi.aau.dk (Morten Grouleff)
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Re: Game port/joystick info requested
Date: 24 Jul 92 00:26:28 GMT
Organization: DAIMI: Computer Science Department, Aarhus University, Denmark

The pinout is as follows...

1	+5V dc
2	Button A-1
3	Pos A-X
4	Ground
5	GrY
6	Pos A-7
7	Button A-2
8	+5V dc
9	+5V dc
10	Button B-1
11	Pos B-X
12	Ground
13	Pos B-Y
14	Button B-2
15	+5V dc

The joysticks are named A & B, the buttons on each 1 & 2.
On the subject of how big the resistors should be, I can't be of any help.

Morten Grouleff
grouleff@daimi.aau.dk
Newsgroups: comp.sys.ibm.pc.hardware
From: bp112@cleveland.Freenet.Edu (Steven C. Lin)
Subject: One way modem?!?!?!
Organization: Case Western Reserve University, Cleveland, Ohio, (USA)
Date: Thu, 23 Jul 92 05:33:14 GMT


I'm kinda new to MS-DOS systems, so I could just be making a 
stupid mistake, but here goes...

A friend of mine is trying to get her modem to work on an old
286/8.  The modem works okay on my computer (a 486/33), so I
think the modem itself is okay.  Using the shareware version
of Procomm, and her computer, strange things happen.  THe modem
does not give a response to any commands (i.e. no OK after an
AT command), and no CONNECT or NO CARRIER, etc. replies, BUT
it does respond to the commands.  I mean, if you type ATDT5551212,
you can hear the modem dialing, but it will  not respond with
either a CONNECT or NO CARRIER.  Yes, the modem is hayes comp.
and I already checked for conflicting IRQ and com ports (It is
on COM2 due to a mouse on com1.)  I have no idea what to try
next, so any help would certainly be appreciated!!! Thanks
a lot in advance... :)

						Steve Lin
						bp112@cleveland.freenet.edu

P.S. I forgot to say, the modem will connect, although with
no message, but you will receive nothing.  It is as if the host
is dead (that's what I thought at first), but actually (I believe),
the host is sending information, but the modem will not relay the
data to the computer! Thanks again!!
Newsgroups: comp.sys.ibm.pc.hardware
Subject: HELP:  AST 386SX & LK250 keyboard
From: strickland_p@eis.dofasco.ca (Peter Strickland)
Date: 23 Jul 92 10:45:45 GMT
Organization: Dofasco Inc, Hamilton, Ont. Can.
Nntp-Posting-User: strickland_p

One of the executives in Dofasco's Engineering department is using an
AST 386SX Exec. laptop computer with a DEC LK250 external keyboard.
Every time he connects to his local LAN with his Xircom external ethernet
adapter, the external keyboard starts acting funny.  He will press 'C',
for instance, and the computer will act as if he's pressed 'F'.  The odd
thing is that if he presses 'C' again, the computer will behave properly.

All of his hardware seems to be behaving as designed.  I swapped in another
AST 386SX Exec. and reproduced the problem.  I swapped in another DEC LK250
external keyboard and reproduced the problem.  Without the external keyboard
attached, everything works fine, so I don't think there's a problem with his
Xircom box either.

Can anyone suggest a cause and/or a fix for this problem?

-- 
Peter Strickland				Dofasco Inc.
(strickland_p@eis.dofasco.ca)			1330 Burlington St East
(416)544-3761 X2389				Hamilton, Ont. L8N 3J5 Canada
From: davidsen@ariel.crd.GE.COM (william E Davidsen)
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Re: Does turbo mode use more power / get hotter?
Keywords: 86 turbo heat power
Date: 24 Jul 92 18:46:02 GMT
Reply-To: davidsen@crd.ge.com (bill davidsen)
Organization: GE Corporate R&D Center, Schenectady NY

In article <14n2hqINNrk6@agate.berkeley.edu>, forest@soda.berkeley.edu (Forest Edward Wilkinson) writes:
| 
| If I run my 386DX-33 in non-turbo mode, will it use less power,
	probably
| or run cooler?
	it should
|                 Is it any easier on the CPU?
	I doubt it.
|                                               Will it generate
| less RFI inside the case?
	Unlikely.

-- 
bill davidsen, GE Corp. R&D Center; Box 8; Schenectady NY 12345
	It never ceases to amaze me that otherwise rational people, able to
	understand calculus, compound interest, and the income tax form, can
	continue to believe that poker is a game of chance.
From: davidsen@ariel.crd.GE.COM (william E Davidsen)
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Re: Two machines, one keyboard?
Date: 24 Jul 92 19:00:02 GMT
Reply-To: davidsen@crd.ge.com (bill davidsen)
Organization: GE Corporate R&D Center, Schenectady NY

In article <1992Jul24.080944.17870@starbase.trincoll.edu>, nmiller@starbase.trincoll.edu (norman miller) writes:

| Is it possible to connect one keyboard to both machines via
| a switching device?

  Since other may want to know, yes, switches are made which will do
what you want. They run ~$25 I believe. For about $40 you can get a
switch which does the monitor and keyboard.

  Prices are as of a recent computer show, please don't mail me better
prices, I am not in the market at any price. Thank you.
-- 
bill davidsen, GE Corp. R&D Center; Box 8; Schenectady NY 12345
	It never ceases to amaze me that otherwise rational people, able to
	understand calculus, compound interest, and the income tax form, can
	continue to believe that poker is a game of chance.
From: mkh@coriolis.UUCP (michael hamilton)
Newsgroups: comp.sys.ibm.pc.hardware
Subject: problem with modem/fax card
Date: Wed, 22 Jul 92 05:20:15 PDT
Organization: Albedo Communications

    A friend of mine has a Bitvax 9600 fax/2400 modem card.  When he 
leaves his computer on and enabled to receive a fax, he can send one home 
allright, but then his phone never hangs up.  He has the card enabled as 
com3 (which I think is part of the problem), uses Procomm 2.4.2 as his 
comm software, and the Bitfax software for sending and receiving faxes.

    Has anyone had a similar problem, or can anyone volunteer a 
suggestion?  Calls to the company have resulted in being kept on long 
distance hold.

    Mail works best.  Thanks.


----
michael hamilton
{..any gateway}!usc!coriolis!mkh / albedo communications
mkh%coriolis@usc.edu / los angeles, ca / 310-826-1721 / almost public access
From: betsys@cs.umb.edu (Elizabeth Schwartz)
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Is a NEC JC-1401 P3A a VGA monitor?
Date: 29 Jul 92 23:44:39 GMT
Distribution: comp
Organization: University of Massachusetts at Boston

I have acquired on long-term loan a NED JC-1401P3A monitor, which I 
have attached to an ancient multisync EGA card (for which I have the
mode-setting software but no docs)
  1) is this monitor VGA compatible?
  2) if so, are there any limitations or will any VGA card work?
  3) does anyone have the switch settings? It has 5 DIP switches, a
     Manual <->something switch and a TTL <-> Analog switch. 

Thanks for any advice! I am nursing along my ancient AT (until I can
afford an X-compatible machine) and VGA would be fun!

thanks, Betsy
--
System Administrator                  Internet: betsys@cs.umb.edu
MACS Dept, UMass/Boston               BITNET:ESCHWARTZ%UMBSKY.DNET@NS.UMB.EDU
100 Morrissy Blvd                     Staccato signals
Boston, MA 02125-3393                      of constant information....
Newsgroups: comp.sys.ibm.pc.hardware
From: simmons@texhrc.uucp (Bob Simmons)
Subject: Re: Samsung 17" and CTX 17" monitors, which one?(if either)
Organization: Texaco EPTD
Date: Tue, 28 Jul 1992 12:20:48 GMT

In article <BrwGB9.456@news.cso.uiuc.edu> tamu@uxh.cso.uiuc.edu (Todd Henderson) writes:
>
>I was wondering if anyone has any comments about the Samsung 17" monitor
>or the CTX 17"(1760 model I think) monitor.  It seems that you can get them
>for under $900.00.
>
We have several Samsung 17" here at work (I have one on my desk) and are
quite happy with them. I'm running mine with Windows 3.1 1024x768x256 non-
interlaced hooked to a STB PowerGraph ERGO card. It's a great combination
and the price is very comfortable.

-- 
_______________________________________________________________
Bob Simmons          | Standard    | simmons@Texaco.COM
E&P Technology Dept. | disclaimers | uunet!nuchat!texhrc!simmons
Texaco Inc.          | apply.      | (Inside Texaco) simmons@texhrc
From: shenyk@memstvx1.memst.edu
Newsgroups: comp.sys.ibm.pc.hardware
Subject: thanks! Re:IDE 1806 cyln. problem
Date: 23 Jul 92 10:13:32 -0600
Organization: Memphis State University

From: g89r4222@alpha.ru.ac.za (Geoff Rehmet)
      faruque@sun.soe.clarkson.edu (Abdullah Faruque)
      gude@uniwa.uwa.edu.au (David J W Emrich)
      Henrik St|rner <storner@diku.dk>
      bauwens@acs.ucalgary.ca (Luc Bauwens)
      (Scott A. McMullan)

To: shenyk@memstvx1.memst.edu
Subject: Re: IDE 1806 cylin. formatting ? help


Thank Everybody to help me solve it out.
basically, if cylinder larger than 1024, make it helf will do the magic
and I call the Conner Tech. verified that should be
type	cyl.	head	WPcom	LZone	Sect	size
47	903	8	0	903	46	162
actually it's
47	1806	4	?	?	46	162

so the rule of thumb is cyl/2 and head*2 as long as size same or less

=CHEN=

Newsgroups: comp.sys.ibm.pc.hardware
From: O1DSH@VM1.CC.UAKRON.EDU (David Heck)
Subject: HP Laserjet+ 2686A Expansion memory
Organization: The University of Akron
Date: Tue, 28 Jul 1992 18:57:33 GMT

I've recently purchase a used HP Laserjet+ 2686A and would like to add
some expansion memory to boost it up to 2MB.  Does this printer use
256k simms like other HP's?  Can anyone offer some tips?
 
David Heck
Newsgroups: comp.sys.ibm.pc.hardware
From: bp112@cleveland.Freenet.Edu (Steven C. Lin)
Subject: Re: 3 chip vs 9 chip SIMMs
Organization: Case Western Reserve University, Cleveland, Ohio, (USA)
Date: Tue, 28 Jul 92 22:11:02 GMT


 
Along this line, does anyone know of a FAQ or anything about
memory??? I may sound like an idiot, but I have recently
entered the MSDOS world, and would like to add more memory, but
all this with wait states, 70,80, 90 nanosec, 1MBx3, 1MBx9, etc.
is really getting me confused!!!
Steve Lin
bp112@cleveland.freenet.edu
Newsgroups: comp.sys.ibm.pc.hardware
From: yarvin@highlite.uucp (Curtis Yarvin)
Subject: Re: how good is ati 8514
Organization: Gotham Communications Research
Date: Fri, 24 Jul 1992 04:03:46 GMT

In article <1992Jul21.1488.25668@dosgate> "kenneth tam" <kenneth.tam@canrem.com> writes:
> 
>The apparently solution is to hook up the ET4K's output AND the 8514's
>output to a monitor, and switch between them.  Of course, you need
>either two monitors or one that can switch ;).

Or a switchbox, which costs about $15.  Mine, though, degrades the
picture quality somewhat; I can't speak for all, but have a feeling
this is to be expected.

c
Newsgroups: comp.sys.ibm.pc.hardware,comp.os.os2.misc
From: veit@du9ds3.uni-duisburg.de (Holger Veit)
Subject: Re: Can I mix 70ns SIMMS with 80ns SIMMS
Date: 29 Jul 92 10:54:08 GMT
Reply-To: veit@du9ds3.uni-duisburg.de
Organization: Uni-Duisburg FB9 Datenverarbeitung

In <l7cno9INN6v7@tokio.cs.utexas.edu> graham@cs.utexas.edu (Ralph Arnold Graham) writes:

>In article <1992Jul28.172146.21250@njitgw.njit.edu> dic5340@hertz.njit.edu (David Charlap) writes:
>>Dave Arnold writes:
>>>I am upgrading to OS/2 2.0, and so I need 8 megabytes of RAM.
>>>Can I safely mix 80ns chips with 70ns chips
>>>for use with OS/2?  I was told that OS/2 is very sesitive to memory.
>>
>>I don't think you'll have a problem, but get a warantee, anyhow.

>I have successfully mixed four 1MBx9 60 ns SIMMs and four 1MBx3 70 ns SIMMs
>in my 386-20 and have had no problems running OS/2 2.0...


>-- 
>-----------------------------------------------------------------------------
>	Ralph Graham		                graham@cs.utexas.edu
>     . . . life is merely a wretched cesspool of twisted emotions . . . 
>-----------------------------------------------------------------------------

The problem is not really the different access time, as long as the slowest
chipset is at least as fast as it should be for the processor clock
frequency (e.g. 70ns for 386/33 with 1 wait state, 60 for 0 WS).

It is usually the above combination of 1MBx9 and 1MBx3 that may or may not work
depending on the chipset your 386 board uses. Some older chipsets are not 
designed for 4MB SIMMs and will accept 1MBx3 SIMMs in DOS applications,
but not under OS/2 or other protected mode OSes. 
This is because the 3 chip SIMM has 4 Meg chips on it (two 1Mbit x 4 and one
1Mbit x 1). 4Meg chips have an additional refresh line which is not serviced
by older chip sets. Thus, you use the 3-chip SIMM outside of the specification,
which is critical in particular in OS/2.

Conclusion: look into your motherboard's manual. If it accepts a configuration
with 4 Megabyte SIMMs/SIPs (not 4 x 1MByte in a bank, but 16 MByte in a bank),
then you are safe to use 3-chip sets. Otherwise use 9-chip sets.

Bye

Holger


-- 
|  |   / Holger Veit             | INTERNET: veit@du9ds3.uni-duisburg.de
|__|  /  University of Duisburg  | BITNET: veit%du9ds3.uni-duisburg.de@UNIDO
|  | /   Dept. of Electr. Eng.   | "No, my programs are not BUGGY, these are
|  |/    Inst. f. Dataprocessing |          just unexpected FEATURES"
From: cs2@doc.ic.ac.uk (Christopher Stuart)
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Jumper settings on HD controller cards.
Summary: I need the jumper settings for ST22M & WD1006-SR2. Can you help?
Keywords: Boring question, hard disk controller cards, death to MS-DROSS.
Date: 29 Jul 92 12:04:13 GMT
Organization: Department of Computing, Imperial College, University of London, UK.

Does anyone know the jumper settings for the ST22M and WD1006-SR2 controller
cards? I would be very grateful if you could mail them to me.
-- 
/*----------------------------------------------------------------------------*/
/*  Christopher Stuart:  cs2@doc.ic.ac.uk				      */
/*			 Dept. Computing, Imperial College, London.	      */
/*----------------------------------------------------------------------------*/
Newsgroups: comp.sys.ibm.pc.hardware
From: vincent@uvm.edu (Jim J Vincent)
Subject: Help Low Level Format on IBM ps/2
Keywords: low level format ps/2
Organization: University of Vermont -- Division of EMBA Computer Facility
Date: Tue, 21 Jul 1992 18:35:31 GMT

Can anyone tell me how to perform a low level format on an IBM PS/2
model 30, both the original and the 286 versions? Both have a 20M
drive that came standard with the system. Using debug g=C800:5 does
not work. The starter disk has a format menu selection but it only
allows formatting of a floppy (as far as I can tell). Has anyone ever
done this? Any help would be greatly appreciated.
E-mail is especially appreciated.

				Thanks,
				Jim Vincent
				vincent@orville.psu.edu
From: krn@waikato.ac.nz
Newsgroups: comp.sys.ibm.pc.hardware
Subject: On board VGA jumper selection problem
Date: 29 Jul 92 22:36:25 +1200
Organization: University of Waikato, Hamilton, New Zealand

	The PC I am using is has got a card and monitor with SuperVGA
capabilities but I find that I cannot use the extended VGA modes that it
is supposed to support. I have a program (called ADAPTER.EXE that came with
SVGA111) that determines what type of card you have and what display resolution
you can display. It shows that the computer will display 320x200x256 and 
640x400x256 but the latter does not work. The manual for it displays an
On Board VGA Jumper Select table that give three different alternatives.
It is currently at the 'Software Control' setting and has two more that
are 'Hardare Enable' and 'Hardware Disable'. Should this jumper be set to
'Hardware Enable' to obtain the extended modes or is it another problem?
The BIOS is Phoenix 80386SX ROM BIOS Version 3.01. Could this be the reason
why the extended modes do not work?

Newsgroups: comp.sys.ibm.pc.hardware
From: pss1@kepler.unh.edu (Paul S Secinaro)
Subject: Re: 486/50DX and 486/33DX:  P5 Upgradable?
Organization: University of New Hampshire  -  Durham, NH
Date: Tue, 21 Jul 1992 14:56:04 GMT

In article <RFowler.284@kelvin.jpl.nasa.gov> RFowler@kelvin.jpl.nasa.gov (Robert A. Fowler) writes:

>No, *ALL* 33MHz i486-33 montherboards have a 66MHz occilator, becuase normal 
>Intel CPUs (80x86) require a 2x clock.  So to run at 33MHz it needs to be 
>suplied with a 66Mhz clock.

Are you sure about that?  I heard that the 486 uses a 1x clock whereas
the 386 and below used 2x.

  The DX2 CPUs will run on a 1x internal clock, 
>there for a 66Mhz DX2 needs a 66MHz occilator, not a 132Mhz one.
>

No, the DX2's work by doubling the bus clock frequency via a
phase-locked loop.  They don't just pull in the 2x clock from the
motherboard - the double the 1x clock internally.  So a 486DX2-66 uses
a 33MHz external clock and doubles it internally.

Paul
-- 
Niven's Law #14:   There exist minds that think as well as you do, but
                   differently.
Niven's Corollary: The gene-tampered turkey you're talking to isn't
                   necessarily one of them.