To: opendos AT delorie DOT com
Message-Id: <AA8HOqq4D1@insect.ief.spb.su>
Organization: Inst. of Evolutionary Physiology & Biochemistry,
    St.Petersburg
From: pavel AT insect DOT ief DOT spb DOT su (Pavel Ozerski)
Date: Fri, 30 Jan 98 10:42:00 +0300
Reply-To: pavel AT insect DOT ief DOT spb DOT su
Subject: OD702: a bug in kernel?
Precedence: bulk

I think, I found the cause of DOS-UP conflict and a bug in the OpenDOS kernel.
To find it, I used Quarterdeck Manifest and DOS MEM.

Novell DOS 7(15) - QEMM's MFT reports:
                   026B - 0289   0.5K  COMMAND
                   028A - 029A   0.3K  COMMAND Environment
                   B22F - B391   5.5K  COMMAND Data <!!!!!!!!!
Novell DOS 7(15) - MEM/F reports:
 FFFF:00E0 |  COMMAND |   1620h,   5 664 | Program
!FFFF:1780 |      DOS |    F30h,   3 888 | DOS BIOS code
 FFFF:26B0 |      DOS |   6F90h,  28 560 | DOS kernel code
 FFFF:9640 |      DOS |   5320h,  21 280 |  BUFFERS=  40 disk buffers
 FFFF:E960 | -------- |   1690h,   5 776 | FREE


DR-OpenDos 7.02 -QEMM's MFT reports:
                   029E - 02BC   0.5K  COMMAND
                   02BD - 02CD   0.3K  COMMAND Environment
                   B001 - B209   8.1K  COMMAND Data <!!!!!!!
DR-OpenDOS 7.02 - MEM/F reports:
 FFFF:00E0 | -------- |   16A0h,   5 792 | FREE     <!!!!!!!!!!!!
!FFFF:1780 |      DOS |    F30h,   3 888 | DOS BIOS code
 FFFF:26B0 |      DOS |   71E0h,  29 152 | DOS kernel code
 FFFF:9890 |      DOS |   5320h,  21 280 |  BUFFERS=  40 disk buffers
 FFFF:EBB0 | -------- |   1440h,   5 184 | FREE

As is shown, the COMMAND data by OpenDOS is much greather as by NWDOS,
but the storage reserved in the HMA for COMMAND data is equal. Therefore,
by OpenDOS always is not enough memory to load COMMAND into HMA. To fix this
bug, the storage for DOS BIOS code in HMA must be moved higher!!!
I'm waiting for answers.
-- 
Pavel V. Ozerski            | Inst. of Evolutionary Physiology & Biochemistry,
office +7 (812)552-6870(291)|           Russian Academy of Sciences,
FAX    +7 (812)552-3012     |  Thorez pr. 44, St.Petersburg, 194223, Russia
home   +7 (812)528-5576     |          E-mail:  pavel AT insect DOT ief DOT spb DOT su