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From: ljz@well.UUCP (Lloyd Zusman)
Newsgroups: net.micro.pc
Subject: Re: Ramdisks in high memory
Message-ID: <1105@well.UUCP>
Date: Thu, 15-May-86 18:53:04 EDT
Article-I.D.: well.1105
Posted: Thu May 15 18:53:04 1986
Date-Received: Sun, 18-May-86 10:55:14 EDT
References: <1893@ihlpg.UUCP> <1897@ihlpg.UUCP> <2104@cbosgd.UUCP> <837@cyb-eng.UUCP>
Reply-To: ljz@well.UUCP (Lloyd Zusman)
Organization: Whole Earth Lectronic Link, Sausalito CA
Lines: 37

>> I just looked in my DOS manual for the 6300 plus.  There is nothing
>> called VDISK.  There is something called RAMDISK, documented in
>> appendix H.  But no /E option or anything comparable.
>> 
>> Perhaps VDISK comes from some other source?  If so, where can we get it?
>> It's silly to have a third of a MB sitting there wasted while I eat up
>> my precious 640K with a RAM DISK.
>> 
>> 	Mark
>
>For sure vdisk.lst and vdisk.sys is on the second ("supplemental") diskette
>sent by IBM as PC-DOS 3.1.  vdisk.lst is a listing file, so some work needs
>to be done if you want to modify and reassemble the source.  But vdisk.sys
>works fine, as stated above, though it must be an IBM thing rather than a
>Microsoft thing.

Sorry, but VDISK.SYS does *not* work fine on an AT&T 6300-Plus with the
/E option.  I took it off of my IBM PC-DOS system and tried using it on
my 6300-Plus.  Without the /E it was fine, but with it my system hung.

By taking VDISK.LST and getting rid of the extraneous listing stuff, I
was able to assemble it into another VDISK.SYS, which also worked the
same way (and, incidentally, was identical to the originally assembled
VDISK.SYS).

So once again, does anyone know either ...

1)  ... how to alter VDISK.SYS so that it'll work on an AT&T 6300-Plus using
    main motherboard memory above 640K?

2)  ... where I could find a device driver that will do this on the
    AT&T 6300-Plus?

Lloyd Zusman
Master Byte Software

...!well!ljz