Programming; Configuration; Control; Table F-3. Ati Rage Pro Pci C - Compaq EN Series Technical Reference Manual

F.4

PROGRAMMING

F.4.1

CONFIGURATION

The graphics card works off the AGP bus and is configured through PCI configuration space
registers using PCI protocol. These registers (Table F-3) are configured by BIOS during POST
Table F–3. ATI RAGE PRO PCI Configuration Space Registers
PCI Config.
Address Function
00h Vender ID (1002h)/Device ID (4744h)
04h PCI Command
08h Status
10h Display Memory Base Address
For a discussion of accessing PCI configuration space registers refer to chapter 4. For a detailed
description of registers refer to applicable ATI Technologies, Inc. documentation.
F.4.2

CONTROL

F.4.2.1 Standard VGA Modes
Table F-4 list the control registers used for operating in standard VGA mode. No special drivers
are required for VGA, EGA, and CGA modes. For a detailed description of the registers refer to
applicable ATI Technologies, Inc. documentation.
Table F–4. Standard VGA Mode I/O Mapping
I/O
Address
3B5.00..26h*
3BAh
3C1.00..14h*
3C2h
3C5h.00..04h*
--
* Index at base minus 1 (i.e., if base is 3B5h, index is at 3B4h.
F.4.2.2 Extended VGA Modes
Extended modes use the on-board video BIOS (contained in a flash ROM) and the supplied
driver (which is the same for both cards).
ATI RAGE PRO PCI Configuration Space Registers
Standard VGA Mode I/O Mapping
Function
CRT Controller (mono)
VSYNC Control, Display Status
Attribute Controller
Misc. Control / Status
Sequencer
--
Original - April 1998
Table F-3.
PCI Config.
Address Function
14h Relocateable I/O Base Address
30h Expansion ROM Base Address
3Ch Interrupt Line / Interrupt Pin
-- --
Table F-4.
I/O
Address Function
3C6h..3C9h RAMDAC
3CAh Read VSYNC Status
3CCh Misc. Control, Read
3CF.00..08h Graphics Controller
3D5.00..26h* CRT Controller (color)
3DAh VSYNC Control, Display Status (color)
Compaq Personal Computers
Technical Reference Guide
F-5