Tri-M Systems MOPS/586 - Manual (Page 8)

MOPS/586 Memory Map for BIOS, SSD and JRC Support
Memory Map for BIOS, SSD and JRC Support
The BIOS includes two special extensions to support the onboard silicon state disk and Jumptec Remote Control.
If the SSD is enabled in setup or the JRC client finds a host the code of the bios extension will be copied into
shadow ram. The location where the biosextension is placed is automatically determined by the system bios .
The user can not influence this! So care must be taken, when a Extended Memory Manager is used. To avoid
memory conflicts exclude the area E0000h-EFFFFh and do’nt include the area C0000h-DFFFFh !
DOS allows to address 1MByte directly. The memory area above 1MByte (high memory, extended memory) is
accessed under DOS via special drivers like HIMEM.SYS, EMM386.EXE etc. Other operating systems (OS/2,
Windows-NT) allow to address the full memory area directly.
Standard Memory Map
000000h +-------------------+ -
¦ Interruptvectors ¦ ¦ 640KByte
¦ BIOS-variables ¦ ¦ of
¦ IO.SYS, MSDOS.SYS ¦ ¦ main memory
¦ COMMAND.COM ¦ ¦
¦ Applications ¦ ¦
0A0000h +-------------------¦ +
¦ EGA/VGA Video- ¦ ¦
¦ Adapter ¦ ¦ upper memory
0B0000h +-------------------¦ ¦ area
¦ MGA/CGA Video- ¦ ¦ (RAM areas not
¦ Adapter ¦ ¦ used by video
0C0000h +-------------------¦ ¦ cards can be -
¦ VGA BIOS ¦ ¦ used otherwise) ¦ 48KByte
0CC000h +-------------------¦ ¦ ¦ Shadow RAM
¦ BIOS-extensions ¦ ¦ (all not used -
¦ Shadow-RAM ¦ ¦ areas could be
¦ Dual port RAM ¦ ¦ used otherwise)
¦ etc. ¦ ¦
0E0000h +-------------------¦ ¦ -
¦ System-Setup ¦ ¦ ¦ 128KByte
¦ System-BIOS ¦ ¦ ¦ Shadow RAM
100000h +-------------------¦ + -
¦ ¦ ¦ higher memory area
110000h +-------------------¦ +
¦ ¦ ¦ extended or
¦ ¦ ¦ expanded memory
+-------------------+
Tri-M Systems Inc., 6-1301 Ketch Court, Coquitlam, B.C., V3K 6X7, Canada
Phone: (604) 527-1100, (800) 665-5600 Fax: (604) 527-1110
Email: [email protected] Web: www.Tri-M.com