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Technical Reference Guide
Compaq Deskpro EN Series of Personal Computers
Desktop and Minitower Form Factors
Third Edition - September 1998
4-51
4.8 SYSTEM MANAGEMENT SUPPORT
This section describes the hardware support of functions involving security, safety, identification,
and power consumption of the system. System management functions are handled largely by a
System Security ASIC. Most functions are controlled through registers (Table 4-23) accessed
using the indexed method through I/O ports 0C50h (index) and 0C51h (Data).
Table 4–23.
System Management Control Registers
Table 4-23.
System Management Control Registers
Index Function
00h Identification
02h Temperature Status / Clear
03h Temperature Interrupt / SMI Enable
05h Power On LED Blink Control
12h General Purpose Open Collector (GPOC) Bits
13h Secured GPOC Bits
20h Power Button Control
21h SMI / SCI Source
22h SMI / SCI Mapping
30h REQ/GNT Control
80h Super I/O Security Control
81h Super I/O Index Address Low
82h Super I/O Index Address High
83h Super I/O Index Data
84h Super I/O Data Address Low
85h Super I/O Data Address High
86h Super I/O Write Block 0
87h Super I/O Write Block 1
88h Super I/O Write Block 2
89h Super I/O Write Block 3
The following subsections describe the system management functions. Any BIOS interaction
required of these functions is described in Chapter 8, “BIOS” or in the Compaq BIOS Technical
Reference Guide.