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Article View: comp.os.msdos.programmer
Article #5093

Re: Accurate timing request

#5093
From: Dave McQuate
Date: Fri, 08 Mar 1991 22:26
508 lines
30852 bytes
Here's a re-post of a hardware based timer with resolution of ~ 830 nS !!!
It doesn't change the DOS timer interrupt rate, so ordinary time & date are
still good.  I use it and modifications of it a lot.


From cahalan@iris613.gsfc.nasa.gov Mon Oct 30 20:04:09 1989
Relay-Version: version Notes 2.8.2 (with RFA)  87/11/24; site hpmwdjm.HP.COM
From: cahalan@iris613.gsfc.nasa.gov (Robert F. Cahalan)
Date: Tue, 31 Oct 1989 04:04:09 GMT
Date-Received: Tue, 31 Oct 1989 19:31:55 GMT
Subject: v05i034: tctimer, Turbo C millisecond timer
Message-ID: <1022@cirrusl.UUCP>
Organization: Goddard Space Flight Center Climate and Radiation Branch
Path: hpmwdjm!hpnmdla!hpl-opus!hplabs!ucbvax!tut.cis.ohio-state.edu!gem.mps.ohio-state.edu!apple!oliveb!tymix!cirrusl!dhesi
Newsgroups: comp.binaries.ibm.pc
Sender: dhesi@cirrusl.UUCP
Followup-to: comp.binaries.ibm.pc.d
Approved: dhesi%cirrusl@oliveb.ATC.olivetti.com
Lines: 483
Summary: tctimer.zoo, Turbo C millisecond timer
X-Submissions-to: ibmpc-binaries%cirrusl@oliveb.ATC.olivetti.com
X-Questions-to: ibmpc-binaries-request%cirrusl@oliveb.ATC.olivetti.com
X-Repost-requests-to: ibmpc-repost%cirrusl@oliveb.ATC.olivetti.com

Checksum:  225051232  (Verify with "brik -cv")
Posting-number: Volume 05, Issue 034
Submitted-by: cahalan@iris613.gsfc.nasa.gov (Robert F. Cahalan)
Archive-name: tctimer/tctimer.uue

I've seen a number of requests lately for a millisecond timer on
ibmpc's.  Here's just the thing, written in TurboC and placed in the
public domain last year.  I've used in on a Toshiba 1000 to redo Shaw's
"dripping faucet" experiment, and reproduced his beautiful fractal
time-time plots at high flow rates, triggering the timer thru the
serial port.

Enjoy!

Robert F. Cahalan              #  Laboratory for Atmospheres
cahalan@iris613.gsfc.nasa.gov  #  NASA-Goddard Space Flight Center
frrfc@scfvm (bitnet)           #  Greenbelt, MD 20771

[
Includes Turbo C source and an executable.  Source contains embedded
assembly code, so you will probably need MASM or TASM or a compatible
assembler.

Checksums obtained with the 4.3BSD "sum" or System V "sum -r" command.

checksum     size (bytes)  file (between BEGIN--cut and END--cut lines)
   50275        27450      tctimer.uue

checksum     size (bytes)  file
   49474        19901      tctimer.zoo

-- R.D.
]

tctimer part01/01
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+````````````````
`
end
END--cut here--cut here
------------------------------------------------------------
Technical Details
Message-ID: <15770002@hpmwdjm.HP.COM>
Path: arc1-ca.pugleaf.net!utzoo!news-server.csri.toronto.edu!rutgers!sun-barr!lll-winken!unixhub!stanford.edu!unix!hplabs!hpl-opus!hpnmdla!hpmwtd!davem
References: <1991Mar6.145414.8747@uwovax.uwo.ca>

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Path: arc1-ca.pugleaf.net!utzoo!news-server.csri.toronto.edu!rutgers!sun-barr!lll-winken!unixhub!stanford.edu!unix!hplabs!hpl-opus!hpnmdla!hpmwtd!davem
From: davem@hpmwtd.HP.COM (Dave McQuate)
Newsgroups: comp.os.msdos.programmer
Subject: Re: Accurate timing request
Message-ID: <15770002@hpmwdjm.HP.COM>
Date: 8 Mar 91 22:26:41 GMT
References: <1991Mar6.145414.8747@uwovax.uwo.ca>
Organization: HP Santa Rosa Site (NMD MTA MWTD). - Santa Rosa, Ca.
Lines: 508