Technical Reference Guide
6.2.4 815E-BASED GRAPHICS PROGRAMMING
The 815E-based graphics controller is configured using PCI configuration registers listed in Table
6-2.
Table 6-2. 815E-Based Graphics Controller PCI Configuration Registers
Table 6-2.
815E-Based Graphics Controller PCI Configuration Registers (GMCH, Function 2)
PCI
Config.
Addr.
Register
Reset
Value
PCI
Config.
Addr.
Register
Reset
Value
00, 01h Vendor ID 8086h 2E, 2Fh Subsystem ID 0000h
02, 03h Device ID 1132h 30-33h Vid. BIOS Base Addr. 0’s
04, 05h Command 0004h 34h Capabilities Pointer DCh
06, 07h Status 02B0h 3Ch Interrupt Line 00h
08h Revision ID 02h 3Dh Interrupt Pin 01h
0A, 0Bh Class Code 0003h 3Eh Min. Grant 00h
0Eh Header Type 01h 3Fh Max. Latency 00h
0Fh BIST 00h DC, DDh Pwr. Mgmt. Capabilities 0001h
10-13h Memory Range Addr. 8 DE, DFh Pwr. Mgmt. Capabilites 0022h
14-17h Mem. Mapped Range Addr. 0’s E0, E1h Pwr. Mgmt. Control 0000h
2C, 2Dh Subsys. Vendor ID 0000h E2-FFh Reserved --
NOTE:
Assume unmarked locations/gaps as reserved. Refer to Intel documentation for detailed
register descriptions.
The graphics controller is controlled through memory-mapped registers by the appropriate
software driver.
6.2.5 UPGRADING 815E-BASED GRAPHICS
The method of upgrading the 815E-based graphics controller is dependent on the system type.
Small Form Factor: No AGP slot is provided for upgrading the AGP graphics. Since PCI
graphics adapters are generally considered inferior to AGP types, a true "upgrade" is not possible
on these systems. However, dual-monitor support is possible by adding a PCI-type graphics card.
Compaq Deskpro EN Slim Desktop/Configurable Minitower: Upgrading the AGP graphics is
facilitated by replacing the existing GPA card with an AGP graphics adapter card. During POST,
the BIOS will detect the presence of the AGP graphics adapter on the AGP bus and disable the
815E-based graphics controller. Dual monitor support is possible by adding a PCI graphics card.
Compaq Deskpro and Evo Personal Computers
Featuring Intel Celeron and Pentium III Processors
Fifth Edition - March 2002
6-5
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