I get only 200 or more conventional memory in dos mode, but in Windows 98, i get more conventional memory, in dos mode, some dos games like epic pinball say that i need at least 560K of memory.
my rig
Gateway LP Minitower TB3 Essential
Intel WS440BX ATX motherboard
Pentium III Katmai 500 mhz
256 MB SDRAM
nVidia Riva TNT2 M64 AGP 32mb
Creative Labs Sound Blaster 16 CT2830 ISA sound card

my config files

AUTOEXEC.BAT
SET BLASTER=A220 I5 D1 H5 P330 T6
SET SOUND=C:\SB16
C:\SB16\DIAGNOSE /S
C:\SB16\MIXERSET /P /Q
GoTo %config%
:EMS
: XMS
:CM
LH C:\WINDOWS\COMMAND\MSCDEX.EXE /D:OPTICAL
LH C:\DOSDRV\CTMOUSE.EXE /R2

CONFIG.SYS
[COMMON]
DOS=HIGH,UMB,NOAUTO
FILES=30
BUFFERS=30

[menu]
menuitem=EMS, MS-DOS Mode with Expanded Memory
menuitem=XMS, MS-DOS Mode with Extended Memory
menuitem=CM, MS-DOS Mode with Conventional Memory

menudefault=EMS,30

[EMS]
DEVICE=C:\WINDOWS\HIMEM.SYS /TESTMEM:OFF
DEVICE=C:\WINDOWS\EMM386.EXE RAM
DEVICEHIGH=C:\DOSDRV\VIDECDD.SYS /D:OPTICAL

[XMS]
DEVICE=C:\WINDOWS\HIMEM.SYS /TESTMEM:OFF
DEVICEHIGH=C:\DOSDRV\VIDECDD.SYS /D:OPTICAL

[CM]
DEVICEHIGH=C:\DOSDRV\VIDECDD.SYS /D:OPTICAL