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Chapter 4 System Support
Compaq Deskpro 4000N and 4000S Personal Computers
First Edition - September 1997
4-38
Configuration Byte 94h, ROM Flash/Power Button Status
Default Value = 00h
Bit Function
7..5 Reserved
4 ROM Flash In Progress (if set)
3 Reserved
2 Power Button Inhibited (ifset)
1 User-Forced Bootblock (if set)
0 ROM Flash In Progress (if set)
Configuration Byte 97h, Asset/Test Prompt Byte
Default Value = 00h
Bit Function
7,6 Test Prompt:
01 = Fake F1
10 = Fake F2
11 = Fake F10
5..0 Asset Value
Configuration Byte 9Bh, Ultra-33 DMA Enable Byte
Default Value = 00h
Bit Function
7..4 Reserved
3 Secondary Slave Enabled for U-33 if Set
2 Secondary Master Enabled for U-33 if Set
1 Primary Slave Enabled for U-33 if Set
0 Primary Master Enabled for U-33 if Set
Configuration Byte 9Ch, Mode-2 Configuration Byte
Default Value = 1Ch
Bit Function
7,6 Reserved
5 Mode 2 Support
0 = Disable
1 = Enable
4 Secondary Hard Drive Controller
0 = Disable
1 = Enable
3,2 Secondary Hard Drive Controller IRQ
00 = IRQ10
01 = IRQ11
10 = IRQ12
11 = IRQ15
1,0 Reserved