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Technical Reference Guide
Compaq Deskpro EN Series of Personal Computers
Desktop and Minitower Form Factors
Third Edition - September 1998
8-17
CX Function
Default
Value
0000h PCI 2.1 Mode (Enabled) 1b
0001h Erase Eaze Keyboard (off) 11b
0002h Comm/IR Port Designation (Comm port) 0b
0003h No Rejection of SETs By PnP (reject SETs) 0b
0004h PCI VGA Snoop (snoop disabled) 0b
0005h PCI Bus Mastering BIOS Support (enabled) 1b
0006h Auto Prompt for Auto Setup (prompt for F1, F2, F10) 00b
0007h Mode 2 Configuration Support (enabled) 1b
0008h Secondary Hard Drive Controller Enabled (enabled) 1b
0009h Secondary Hard Drive Controller IRQ (IRQ15) 11b
000Ah Custom Drive Type #1 40 bits, all 0s
000Bh Custom Drive Type #2 40 bits, all 0s
000Ch Custom Drive Type #3 40 bits, all 0s
000Dh Custom Drive Type #4 40 bits, all 0s
000Eh POST Verbose/Terse or “Silent Boot” Mode (Terse) 1b
000Fh Drive Translation Mode (translate) 0b
0010h Mfg. Process Number Bytes 30 bits, [1]
0011h Administrator Password 72 bits, [1]
0012h Power-On Password 32 bits, [1]
0013h Ownership Tag 640 bits, [1]
0014h Warm Boot Password Mode (disabled) 0b
0015h Hood Lock (enabled) 0b
0016h Hood Removal (disabled) 00b
0017h USB Security (disabled) 1b
0018h Configurable Power Supply (legacy mode) 1b
0019h QuickBoot Mode (full boot always) 11111b
001A-001Ch Onboard NIC (1A)/SCSI (1B)/Pri. IDE (1C) Enables 1b/1b/1b
001Dh Ultra SCSI Mode 1b
001E, 001Fh QuickLock/QuickBlank Enables 0b/0b
0020, 0021h Serial Port 1/Port 2 Security 1b/1b
0022h Parallel Port Security 1b
0023, 0024h Diskette Drive Bootability/Writeability 0b/0b
0025h Asset Tag [1]
0026h Back-to-Back I/O Delay 00b
0027h CMOS /10h-2Fh Backup [1]
0028h QuickLock after Standby Enable 0b
0029-002Ch Audio Enable/IRQ/DMA/Address 1b/01b/10b/00b
002Dh ECP DMA Configuration 011b
002E, 002Fh Serial Port 1 Base I/O Address/Interrupt 3Fh/00b
0030, 0031h Serial Port 2 Base I/O Address/Interrupt 1Fh/00b
0032h Ultra DMA-33 Enable 1111b
0033h Network Server Mode Enable 0b
0034h CIA BOM No. Bytes [1]
0035h Copy Standard CMOS to Backup Location [1]
0036h AGP Monochrome Adapter Search Enable 1b
0037h APM Fan Throttle 1b
0038h Manufacturing Diags Mode 0b
0039h RIPL ROM Boot Mode 0b
003Ah Exit Clean Boot Screen [1]
003B-003Dh Ethernet Speed/Mode/Connector Type 000b/00b/001b
003Eh ACPI Enable 1b
003Fh S/W BOM Serial Number of Bytes [1]
0040h Select ECP Mode 1b
NOTE:
For full bit definitions refer to the
Compaq BIOS Technical Reference Guide
.