Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!rutgers!aramis.rutgers.edu!topaz.rutgers.edu!kaldis
From: kaldis@topaz.rutgers.edu (Theodore A. Kaldis)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Writing to extended memory
Keywords: extended memory
Message-ID: 
Date: 16 Aug 89 12:14:04 GMT
References: <1145@hcx1.UUCP> <693@jc3b21.UUCP> <12048@orstcs.CS.ORST.EDU>
Distribution: usa
Organization: Rutgers Univ., New Brunswick, N.J.
Lines: 21

In article <12048@orstcs.CS.ORST.EDU> cowl1453@neptune.uucp (Tim Cowles) writes:

> I am working on a realtime PC program that uses a very high baud rate
> serial card to aquire roughly 1Mbyte of data from a remote probe.  The
> problem is that I cannot write to the drive while accepting data from
> the serial stream, the timing is too tight and I lose data.   

> Is there a reasonable way to write, during runtime and without using a 
> virtual disk drive (same problem!), to the memory in my machine above 1M ??  
> (It seems like it can be done, the virtual disk device driver does it. )

I seem to recall that even VDISK.SYS has the very same problem when
running in expanded memory -- or at least that there is a caveat in
the IBM DOS manual about it.
-- 
              Theodore A. Kaldis                      |  "Perhaps we may
              +-+-+-+-+-+-+-+-+-                      |   frighten away
      email:  kaldis@topaz.rutgers.edu                |   the ghost of so
       UUCP:  {...}!rutgers!topaz.rutgers.edu!kaldis  |   many years ago
 U.S. Snail:  P.O. Box #1212, Woodbridge, NJ  07095   |   with a little
 ex-Ma Bell:  (201) 283-4855  (voice)                 |   illumination . . ."