1-6 Technical Information
Flash ROM
Machine language programs are stored in a 28F010 Flash ROM known as the system's
ROM BIOS. The system BIOS and video BIOS are contained in the ROM. The Flash ROM
is 128 KB, which consists of 64 KB of system BIOS, and 32 KB of video BIOS.
The Flash ROM allows the BIOS to be upgraded with the BIOS Update utility without re-
moving the ROM (see Section 2, Setup and Configuration). The BIOS can only be repro-
grammed by powering on the system with the BIOS Update utility diskette in Drive A.
The BIOS programs execute the Power-On Self-Test, initialize processor controllers, and
interact with the display, diskette drives, hard disks, communication devices, and peripher-
als. The system BIOS also contains the Setup program and provides VGA controller sup-
port. The hardware setup default copies the ROM BIOS into RAM (shadowing) for
maximum performance.
System BIOS is located in the upper portion of the Flash ROM and video BIOS in the
lower portion. System BIOS is located between F0000h-FFFFFh and supports shadowing
and shadowed memory. System BIOS is write protected and automatically enabled.
Video BIOS is located between C0000h and C7FFFh. If the internal video is disabled, this
range is mapped to ISA. The system memory map in shown in Table Section 1-2.
Table Section 1-2 System Memory Map
Memory Space
Size
Function
000000-07FFFF
512 KB
Reserved for system base memory
080000-09FFFF
128 KB
Mapped to either system base memory or ISA bus*
0A0000-0BFFFF
128 KB
Mapped to either on-board video memory or ISA video memory
0C0000-0C7FFF
32 KB
Mapped to either on-board video BIOS or ISA video BIOS
0C8000-0EFFFF
160 KB
Mapped to ISA bus
0F0000-0FFFFF
64 KB
Reserved for system BIOS
100000-FDFFFF
14.9 MB
Reserved for Extended and/or Expanded system memory
FE0000-FFFFFF
128 KB
Mapped to ISA bus
1000000- On-Board
14.9 MB
Reserved for Extended and/or Expanded system memory
*Always non-cachable.
Summary of Contents for PowerMate 466M
Page 10: ...Contents xiii ...
Page 176: ...Connector Pin Assignments A 15 ...