From: Yoichi Shinoda <shinoda@jaist.ac.jp>
Subject: FYI: 800x600 on Cyber{9385/2,9320} with Xaccel/BSDI
Date: Thu, 19 Sep 1996 00:28:29 JST
To: sanpei@yy.cs.keio.ac.jp
cc: shinoda@jaist.ac.jp


Hi.

There is no need for crude hack like jumping into vesa
graphic mode at boot time.  We only need to manipulate
a single vga extension register with a user mode program
to enable 800x600 on these cyber chips with Xaccel driving
them as TGUI9660.  Following is the short program which
does this task.

----------------------------------------------------------
#include <stdio.h>
#include <sys/types.h>
#include <machine/inline.h>

main(ac, av)
	int ac ;
	char *av[] ;
{
	(void)getireg(0x3c4, 0x0b) ;
	setireg(0x3c4, 0x0e, getireg(0x3c4, 0x0e) | 0x80) ;

	if (ac > 1)
		setireg(0x3ce, 0x30, 0x81) ;
	else
		setireg(0x3ce, 0x30, 0x00) ;
}

setireg(base, idx, val)
{
	outb(base, idx) ;
	outb(base + 1, val) ;
}

getireg(base, idx)
{
	outb(base, idx) ;
	return(inb(base + 1)) ;
}

----------------------------------------------------------

Compile this program into, say, Xcyber.  Calling it without
arguments will set the chip for 800x600. Calling it with any
arguments will set the chip back for 640x480 emulation.
Typical usage would be something like:

	Xcyber ; xinit(or startx) ; Xcyber back

This program was tested on TP560, but should work for most
cyber based systems.  Exiting from X will occasionally leave
the console in weird state, but this is out of a scope of
this hack.  Oh yes, one more thing.  If your xinit (or startx)
exits with your X server running, you may end up with vertical
stripes when Xcyber sets things back for 640x480. Make sure
that you terminate the X server.

Have fun.

--- shinoda