ET(4) | Device Drivers Manual (atari) | ET(4) |
et
— driver for
ET4000 VME graphics cards
et0 at vme0
The et
device driver supports VME graphics
cards based on the Tseng ET4000 chipset. It supports the minimal ioctl's
needed to run X11. The 8Kb control registers are mapped from offset 0x0 to
offset 0x1fff and the 1MB frame buffer is mapped from offset 0x400000 to
offset 0x4fffff. VGA compatible memory is mapped from offset 0xa0000 to
offset 0xc0000.
Cards supported by the et
driver
include:
The clock generator on the Crazy Dots card is an ICS 1394M. Setting the clock is done by writing to a register at offset 0x0. This address cannot be read. The values that can be written to the register and the associated clock are:
Value | Clock |
0x00 |
14318 |
0x10 |
16257 |
0x17 |
20000 |
0x0c |
24000 |
0x04 |
25175 |
0x14 |
28332 |
0x18 |
32514 |
0x1a |
36000 |
0x1c |
40000 |
0x03 |
44900 |
0x0f |
50000 |
0x13 |
50344 |
0x07 |
56644 |
0x11 |
65028 |
0x1f |
80000 |
Julian Coleman
The driver does not support a text mode, so cannot be used as a console.
July 30, 1998 | NetBSD 10.99 |