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
14318
16257
20000
24000
25175
28332
32514
36000
40000
44900
50000
50344
56644
65028
80000

/dev/etvme
 

Julian Coleman

The driver does not support a text mode, so cannot be used as a console.
July 30, 1998 NetBSD 9.4