Macintosh-Tools/dingusppc
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dingusppc/zdocs/atirage.md
joevt cd122ce263 Open Firmware is two words 
Not OpenFirmware.
Also fixed a spelling mistake and removed some extra spaces.
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The ATI Rage is a video card that comes bundled with early Power Mac G3s and New World Macs (like the first revisions of the iMac G3).

Memory Map

The ATI Rage can usually be located at IOBase (ex.: 0xF3000000 for Power Mac G3 Beige) + 0x9000. However, the video memory appears to be at 0x81000000 and is capped at 8 MB.

Register Map

Register Name Offset
BUS_CNTL 0xA0
EXT_MEM_CNTL 0xAC
MEM_CNTL 0xB0
MEM_VGA_WP_SEL 0xB4
MEM_VGA_RP_SEL 0xB8
GEN_TEST_CNTL 0xD0
CONFIG_CNTL 0xDC
CONFIG_CHIP_ID 0xE0
CONFIG_STAT0 0xE4
DST_CNTL 0x130
SRC_OFF_PITCH 0x180
SRC_X 0x184
SRC_Y 0x188
SRC_Y_X 0x18C
SRC_WIDTH1 0x190
SRC_HEIGHT1 0x194
SRC_HEIGHT1_WIDTH1 0x198
SRC_CNTL 0x1B4
SCALE_3D_CNTL 0x1FC
HOST_DATA0 0x200
HOST_CNTL 0x240
DP_PIX_WIDTH 0x2D0
DP_SRC 0x2D8