dingusppc/zdocs/atirage.md
joevt cd122ce263 Open Firmware is two words
Not OpenFirmware.
Also fixed a spelling mistake and removed some extra spaces.
2022-08-22 16:47:38 -07:00

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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 |