Copyright (c) 1998 The NetBSD Foundation, Inc.
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This code is derived from software contributed to The NetBSD Foundation
by Julian Coleman.
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.Dd July 30, 1998 .Dt ET 4 atari .Sh NAME .Nm et .Nd driver for ET4000 VME graphics cards .Sh SYNOPSIS .Cd "et0 at vme0" .Sh DESCRIPTION The .Nm 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. .Sh HARDWARE Cards supported by the .Nm driver include:
p l -item -compact t Crazy Dots II VME graphics card .El .Sh NOTES 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: l -column "Value " "Clock" -offset indent t Em Value Ta Em Clock t Li 0x00 Ta 14318 t Li 0x10 Ta 16257 t Li 0x17 Ta 20000 t Li 0x0c Ta 24000 t Li 0x04 Ta 25175 t Li 0x14 Ta 28332 t Li 0x18 Ta 32514 t Li 0x1a Ta 36000 t Li 0x1c Ta 40000 t Li 0x03 Ta 44900 t Li 0x0f Ta 50000 t Li 0x13 Ta 50344 t Li 0x07 Ta 56644 t Li 0x11 Ta 65028 t Li 0x1f Ta 80000 .El .Sh FILES l -tag -width "xxxxxxxxxx" -compact t Pa /dev/etvme .El .Sh AUTHORS .An Julian Coleman .Sh BUGS The driver does not support a text mode, so cannot be used as a console.