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- From: gcw@castle.ed.ac.uk (G Watson)
- Newsgroups: comp.os.msdos.misc,comp.os.msdos.programmer
- Subject: Problems with receiving Satellite data via DMA...
- Summary: Help wanted with DOS Hacks
- Keywords: Bloody MS-DOS , Crashing , unreliable , Grrr
- Message-ID: <27966@castle.ed.ac.uk>
- Date: 10 Nov 92 18:24:01 GMT
- Distribution: comp
- Organization: Edinburgh University
- Lines: 53
-
-
- OK this is the problem :
-
- We have a PC (DELL 200 286 with big fast disk) connected to our high
- resolution Meteosat satellite receiver via a IEEE-488 bus transferring
- data onto the PC memory via DMA calls, and hence onto the PC disk. At
- the end of the transmission this data then gets copied over to our Sun
- network via PC-NFS and makes up the Satellite images of Europe available
- via anonymous ftp from cumulus.met.ed.ac.uk.
-
- The PC runs a simple scheduling program to decide when to receive
- images, ideally it would run forever....
-
- However after it has received about 20 images, DOS falls over with the
- traditional 'General Failure drive c: , abort, retry, ignore etc message
- and no more images are received until someone notices the problem and
- presses the 'f' key a few times....
-
- It would appear that DOS is either not clearing up it's file pointers
- properly, or is not freeing memory.
-
- We've tried a number of solutions, including MARK and RELEASEing memory
- after reception, but to no avail...
-
-
- So the question is :
-
- a) has anyone experienced simillar problems before, and know a solution,
-
- or
-
- b) does anyone know of a method of forcing DOS to automatically 'fail'
- when it reports an 'Retry, abort, fail' type message and get on with the
- job.
-
-
- We'd like to make satellite animations generally available via ftp, but
- until we sort out this reliability problem.....
-
- Many thanks,
-
-
- Gordon.
-
-
-
- =====================================================================
- Gordon C. Watson, _------_
- { { }
- Meteorology Department, Edinburgh University, (__________)
- Scotland. / / / /
- JANET - G.C.Watson@uk.ac.ed INTERNET - gcw@met.ed.ac.uk
- =====================================================================
-