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svgalib.et4000(7)             Svgalib User Manual            svgalib.et4000(7)



NAME
       svgalib.et4000, libvga.et4000 - Information for Tseng ET4000 users


TABLE OF CONTENTS
       NOTE:  The ET4000 register layout changed stepping from svgalib 0.98 to
       0.99. See 8. Problems below first


       1. Basics of ET4000 cards
       2. How to configure svgalib(7)
       3. Creating card dependent register values
       4. Defining new modes
       5. Redefining standard modes
       6. Available examples
       7. ET4000/W32 support
       8. Problems
       9. Using dynamic loading with other cards


1. BASICS OF ET4000 CARDS
       Basically all ET4000 cards are equal, some are even more equal ...

       The Chipset is well documented (by Tseng Labs and eg. the  vgadoc2.zip)
       and  all graphics functions can be used the same way on different cards
       (including the ET4000/W32 based ones). There are three important points
       to be kept in mind:


       a.)    amount of available, the organisation and timing of video memory

       b.)    type and capabilities of the DAC

       c.)    available oscillator frequencies

       svgalib(7)  will  check the available video memory during startup. This
       should work on all DRAM cards. If there  are  any  problems  concerning
       VRAM equipped cards, please tell us about.

       By  now  we found is no reliable way to detect the memory organisation/
       timing and the DAC type/capabilities. Most modern card use a  frequency
       synthesizer and provide the following pixel frequencies (in MHz):

              50.350 56.644 65.0 72.0 80.0 89.8 63.0 75.0

       Checking  older  ET4000 cards we found a wide spread range of available
       frequencies. Since the video timing is based on  the  pixel  frequency,
       the required register values are card dependent.


2. HOW TO CONFIGURE SVGALIB
       svgalib(7)  has  a somewhat 'standard' registers set that may work with
       modern ET4000 cards. If svgalib(7) fails on your machine or you have  a
       HiColor dac, you need to configure your svgalib(7).

       The svgalib(7) may use hard linked or dynamical linked register values.
       If you use hard linked values, the binary will be smaller and start  up
       faster but might fail on other machines.

       Compiling  the  svgalib(7) with DYNAMIC defined (see Makefile.cfg) will
       set  up  dynamic   register   loading.   Otherwise   the   value   from
       svgalib/et4000.regs will be hard linked.

       The  dynamic  configuration  will  be  read from /etc/vga/libvga.et4000
       which is an ASCII file (see Makefile.cfg for exact naming). If you have
       a   working  et4000.regs  for  your  system  just  copy  this  file  to
       /etc/vga/libvga.et4000   or   link   /etc/vga/libvga.et4000   to   your
       svgalib/et4000.regs file.

       The actual scanner/parser will handle the following entries:


       #define DAC_TYPE <&lt;integer>&gt;
              Overwrite the DAC detection

       #define <&lt;MODE1>&gt; <&lt;MODE2>&gt;
              Enable MODE1 using MODE2 registers, eg. 64K modes like 32K modes

       #define <&lt;MODE>&gt; DISABLE_MODE
              do not use MODE (eg. from vgadrv)

       char <&lt;MODE>&gt;<&lt;strg>&gt;[..] = {<&lt;integer>&gt;, <&lt;integer>&gt;, ... };
              register definition

       with

       <&lt;MODE>&gt;    ::= 'g'<&lt;decimal>&gt;x<&lt;decimal>&gt;x<&lt;color>&gt;<&lt;ignored>&gt;
       <&lt;integer>&gt; ::= <&lt;decimal>&gt;|<&lt;hex>&gt;
       <&lt;hex>&gt;     ::= '0x'<&lt;hexdigit>&gt;{<&lt;hexdigit>&gt;}
       <&lt;decimal>&gt; ::= ['+'|'-']<&lt;digit>&gt;{<&lt;digit>&gt;}
       <&lt;hexdigit>&gt;::= <&lt;digit>&gt;|'a..f'|'A..F'
       <&lt;digit>&gt;   ::= '0..9'
       <&lt;color>&gt;   ::= '2'|'16'|'256'|'32k'|'32K'|'64k'|'64K'|'16M'
       <&lt;strg>&gt;    ::= <&lt;empty>&gt;|[(<&lt;alpha>&gt;|'_'){<&lt;digit>&gt;|<&lt;alpha>&gt;|'_'}]
       <&lt;alpha>&gt;   ::= 'a..z'|'A..Z'

       C  style  comments will be skipped. See the et4000/ subdirectory of the
       svgalib distribution for examples.


3. CREATING CARD DEPENDENT REGISTER VALUES
       You may create a et4000.regs on your own with the  tseng3.exe  program.
       This  DOS  program  and its source is included in the svgalib distribu-
       tion.

       Just boot MS-DOS and start

       tseng3 et4000.reg

       The tseng3.exe will measure the video timing for each  available  mode.
       Check  the et4000.regs file against your monitor documentation and dis-
       able all non conformant modes, eg.

       #define g1024x768x256_regs DISABLE_MODE
       /*
       static unsigned char g1024x768x256_regs[71] = {
       ...
       };
       */

       will disable the 1024x768x256 mode. You mustn't disable the 640x480x256
       mode!

       Your  et4000.regs must define the following symbols (register values or
       #define ... DISABLE_MODE) for hard linking:

       g320x200x32K_regs,        g640x400x256_regs,         g640x480x256_regs,
       g640x480x32K_regs,         g640x480x16M_regs,         g800x600x16_regs,
       g800x600x256_regs,        g800x600x32K_regs,         g1024x768x16_regs,
       g1024x768x256_regs, and g1280x1024x16_regs.

       and all 64K modes handled like 32K modes by the driver:

       #define g320x200x64K_regs g320x200x32K_regs
       #define g640x480x64K_regs g640x480x32K_regs
       #define g800x600x64K_regs g800x600x32K_regs

       You may omit every unusable mode in /usr/lib/libvga.et4000.


4. DEFINING NEW MODES
       All  standard  svgalib(7)  modes  may be selected by the mode constants
       defined in #include<&lt;vga.h>&gt; (eg.   G320x200x16).   You  may  define  new
       modes on your own. Just use dynamic register loading and add the regis-
       ter definition of the new mode. Your program may determine the  related
       modenumber by checking the vga_getmodeinfo(1..vga_lastmodenumber()).

       Most  ET4000  cards  provide  640x350  and  640x400 graphics modes. The
       tseng3.exe generates the  related  register  sets.  You  may  also  use
       dumpreg(1) from an X window to grab you favourite X graphics mode.  The
       X mode normally isn't usable directly. See cardex.w32  for  an  example
       and  et4000.c  for  a brief description of et4000 registers (both files
       are included in the svgalib distribution).


5. REDEFINING STANDARD MODES
       Using dynamic register loading you may redefine any standard  VGA  mode
       except  of  TEXT  and 640x480x16. Just add the ET4000 specific register
       set to /etc/vga/et4000.regs.


6. AVAILABLE EXAMPLES
       In the et4000/ subdir of the svgalib distribution you'll find some sam-
       ple register sets:


       cardex.w32
              Cardex ET4000/W32 card, Music TrueColor DAC

       speedstar+
              SpeedSTAR PLUS card, Normal DAC

       orchid.pdII
              Orchid Prodesigner II

7. ET4000/W32 SUPPORT
       The  actual driver seems to be ET4000/W32 compatible. Tell us about any
       problems (and solutions). If  you've  got  any  information  about  the
       ET4000/W32 blitter, we would be pleased to receive it.


8. PROBLEMS
       As mentioned before, the DAC detection isn't very reliable.  vgatest(6)
       should print equal screens in 256 color  and  HiColor/TrueColor  modes.
       You  may have to edit your libvga.et4000 register file by hand to setup
       the correct DAC.

       The tseng3.exe may fail due to incompatible mode numbering.  You  might
       use a VESA driver (eg. tlivesa.com from VPIC 6.0) or edit and recompile
       the tseng3.exe.

       Newer ET4000 chipsets (eg. W32 and W32i) allow up to 32 clock  frequen-
       cies.  Two  additional  register  values were added just before the old
       extended register value. The new registers are CRTC/30h  and  CRTC/31h.
       The  old  register set had 71 values, the new has grown to 73.  You may
       update your old register set by hand:


       -      run the dumpreg program, remember the first two values from last
              data line.

       -      edit your libvga:
              for each mode
                     change the number of register values from 71 to 73
                     add  the values from dumpreg output at front of last data
                     line

       -      run .BR vgatest (6) to check the new register set


9. USING DYNAMIC LOADING WITH OTHER CARDS
       The dynamical register loading may be used  in  other  drivers.   Since
       hard  linked register values work fine for Cirrus and Trident cards, we
       didn't include this feature.



FILES
       /etc/vga/libvga.config
       /etc/vga/libvga.et4000


SEE ALSO
       svgalib(7), libvga.config(5).


AUTHOR
       This documentation for the ET4000 registers  was  provided  by  Hartmut
       Schirmer.  However, it was slightly reformatted by Michael Weller <eow-
       mobATexp-math.de>.



Svgalib (>= 1.2.11)              31 July 1997                svgalib.et4000(7)