Shadowing Disabled; Shadowing Enabled - Mitsubishi Electric LS Pro Hardware Technical Reference

SHADOWING
DISABLED
1M
976K
82596 RPL and
SECURITY
960K
GRAPHICAL BOOT
and SETUP
928K
VIDEO BIOS
896K
784K
768K
Notes
1. This area is occupied by the ROM in the option ROM socket if it is fitted.
2. These memory maps do not include the Token-Ring module RAM and ROM. If fitted
the ROM occupies an 16k block between CC000h and D0000h. The RAM buffer size
and base address are configured by the adapter driver.
The video BIOS, graphical boot and SETUP, 82596 RPL and security and system BIOS
code are all in the main 128kbyte system ROM. After boot is completed only the video
BIOS and system BIOS code is required.
Shadowing With shadowing disabled and the option ROM socket empty the regions from C0000
disabled to E0000 and from E8000 to F4000 are available as UMB space for DOS.
Shadowing When shadowing is enabled the video BIOS is remapped to the C0000 to C8000 area.
enabled Thus with the shadowing enabled and the option ROM socket empty the region from
C8000 to F4000 is available as UMB space for DOS. This is the same amount of UMB
as is available with shadowing disabled, but it is contiguous. This often allows DOS to
make better use of the available space.
Note
The Rev C system board has a slightly different memory map, refer to Appendix B for details.
Memory and I/O Usage
100000
BIOS
F4000
F0000
E8000
E0000
BUS
MEMORY
C4000
NOTE 1
C0000
LS PRO HARDWARE TECHNICAL REFERENCE 5/3
SHADOWING
ENABLED
1M
BIOS
976K
82596 RPL and
SECURITY
960K
GRAPHICAL BOOT
and SETUP
928K
912K
NOTE 1
896K
BUS
MEMORY
800K
VIDEO BIOS
768K
100000
F4000
F0000
E8000
E4000
E0000
C8000
C0000