Scsi Subsystem Data Structure - Adaptec AHA-1740A Technical Reference Manual

Appendix D
EISA Free-Form Data

SCSI Subsystem Data Structure

SCSI Device
0
0
1
1
2
2
3
3
4
4
5
5
6
6
7
7
Reserved
Byte Bit Definitions
Bit 7 - Allow removable media in BIOS disk scan
Bit 6 - More than 1 LUN supported
Bit 5 - Parity check enable
Bit 4 - Send start command
0
Bit 3 - Synchronous negotiation enable
Bit 2 - Disconnection enable
Bit 1 - Ignore error if device not present
Bit 0 - Enable disk BIOS support
Bits 7-3 Reserved
Bits 2-0 Maximum synchronous transfer rate
000 - 10.0 MBytes/second
1 001 - 6.67 MBytes/second
010 - 5.0 MBytes/second
011 - 4.0 MBytes/second
100 - 3.33 MBytes/second
2 Same as Byte 0
3 Same as Byte 1
4 Same as Byte 0
5 Same as Byte 1
6 Same as Byte 0
7 Same as Byte 1
8 Same as Byte 0
9 Same as Byte 1
10 Same as Byte 0
11 Same as Byte 1
12 Same as Byte 0
13 Same as Byte 1
14 Same as Byte 0
15 Same as Byte 1
16-47 Reserved for future use
D-1