Memory Map; Nec Versa 4000 Series System Memory Map - NEC VERSA 4000 Service Manual

1-6 Technical Information

Memory Map

The system supports system and video shadowing, both controlled through complementary
metal oxide semiconductor (CMOS). The system supports BIOS as a cacheable area with
write protection. Table Section 1-1 lists the system's memory map.
To view a more complete breakdown, and to determine available space for the addition of
drivers etc., type MSD at the DOS prompt and press Enter .
Table Section 1-1 NEC Versa 4000 Series System Memory Map
Memory Space
0027FFFFh-
00C0000h
000BFFFFh-
00010000h
000FFFFFh-
000F0000h
000EFFFFh-
000CA000h
000C9FFFh-
000C0000h
000BFFFFh-
000A0000h
0009FFFFh-
0000000h
Size
40 MB
8 MB
64 KB
152 KB
40 KB
128 KB
640 KB
Function
Reserved for Extended Memory
Base Memory
ROM BIOS
Upper Memory Block (UMB)
Video ROM BIOS
Video Memory
Conventional Memory