Chapter 4 System Support
Compaq Deskpro EN Series of Personal Computers
Desktop and Minitower Form Factors
Third Edition - September 1998
4-32
6..0 Reserved
Configuration Byte 0Eh, Diagnostic Status
Default Value = 00h
This byte contains diagnostic status data.
Configuration Byte 0Fh, System Reset Code
Default Value = 00h
This byte contains the system reset code.
Configuration Byte 10h, Diskette Drive Type
Bit Function
7..4 Primary (Drive A) Diskette Drive Type
3..0 Secondary (Drive B) Diskette Driv e Type
Valid values for bits <7..4> and bits <3..0>:
0000 = Not installed
0001 = 360-KB drive
0010 = 1.2-MB drive
0011 = 720-KB drive
0100 = 1.44-MB/1.25-MB drive
0110 = 2.88-MB drive
(all other values reserved)
Configuration Byte 12h, Hard Drive Type
Bit Function
7..4 Primary Controller 1, Hard Drive 1 Type:
0000 = none 1000 = Type 8
0001 = Type 1 1001 = Type 9
0010 = Type 2 1010 = Type 10
0011 = Type 3 1011 = Type 11
0100 = Type 4 1100 = Type 12
0101 = Type 5 1101 = Type 13
0110 = Type 6 1110 = Type 14
0111 = Type 7 1111 = other (use bytes 19h)
3..0 Primary Controller 1, Hard Drive 2 Type:
0000 = none 1000 = Type 8
0001 = Type 1 1001 = Type 9
0010 = Type 2 1010 = Type 10
0011 = Type 3 1011 = Type 11
0100 = Type 4 1100 = Type 12
0101 = Type 5 1101 = Type 13
0110 = Type 6 1110 = Type 14
0111 = Type 7 1111 = other (use bytes 1Ah)