User`s manual

DIGITAL-LOGIC AG MSLB-P5 Manual V0.3
PRELIMINARY 159
The power on self test (POST) of the BIOS initializes additional ROM BIOS extensions (Option ROMs)
if they are accessible in the proper format. The requirements are:
Adapter ROM Requirements
1. The code must reside in the address space between C0000H and F0000H.
2. The code must reside on a 2K boundary.
3. The first two bytes of the code must be 55H and AAH.
4. The third byte must contain the number of 512-byte blocks.
5. The fourth byte must contain a jump to the start of the initialization code.
6. The code must checksum to zero (byte sum).
NOTE: The address space from C0000H to C8000H is reserved for external video adapters (e.g. EGA,
VGA). Part of the address space from D0000H to E0000H is typically used by expanded
memory (EMS).
16.3 Fixed Disk Tables
PhoenixBIOS 4.0 supports up to four fixed-disk drives. For each drive, it supports 39 pre-defined drive
types and four user-defined types (40-43). Below is a table of the pre-defined drive types and their
default values.
End users can modify the user-defined drive type for each fixed disk listed in Setup by using the
menus of the Setup program. This feature avoids the need for customized software for non-standard
drives.
Fixed Disk Tables
Type Cylinders Heads Sectors Wrt Pre Landing
1 306 4 17 128 305
2 615 4 17 300 615
3 615 6 17 300 615
4 940 4 17 512 940
5 940 6 17 512 940
6 615 4 17 -1 615
7 462 8 17 256 511
8 733 5 17 -1 733
9 900 15 17 -1 901
10 820 3 17 -1 820
11 855 5 17 -1 855
12 855 7 17 -1 855
13 306 8 17 128 319
14 733 7 17 -1 733
15 Reserved
16 612 4 17 0 633
17 977 5 17 300 977
18 977 7 17 -1 977
19 1024 7 17 512 1023
20 733 5 17 300 732
21 733 7 17 300 732
22 733 5 17 300 733
23 306 4 17 0 336
24 612 4 17 305 663
25 612 2 17 300 612
26 614 4 17 -1 614
27 820 6 17 -1 820
28 977 5 17 -1 977