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Guest

Sun Feb 26, 2006 2:41 pm   



Hi all,
Does any of you knows where can I obtain the VGA specification (I
believes it is IBM's) ?
Thanks in advance, Mordehay.

Derek Simmons
Guest

Sun Feb 26, 2006 4:59 pm   



I would be interested in this too. Could you forward me this
information too?

Thanks,
Derek

Jerry Coffin
Guest

Sun Feb 26, 2006 8:06 pm   



In article <1140961290.326814.5060
@j33g2000cwa.googlegroups.com>, me_2003_at_walla.co.il
says...
Quote:
Hi all,
Does any of you knows where can I obtain the VGA specification (I
believes it is IBM's) ?

For quite a while now, most video standards have been
handled by VESA. To support plain-Jane VGA, they have a
set of "fallback" timings to run a monitor at 640x480 or
720x480 at:

http://www.vesa.org/Public/SMT/SMT640_720x480V1.pdf

If you want to support other resolutions, they have a
spreadsheet at:

http://www.vesa.org/Public/CVT/CVTd6r1.xls

that allows you to enter resolution, refresh rate, etc.,
and it calculates timing parameters for you (and verifies
whether what you're asking for will be supported by a
typical display).

VESA has quite a few more standards as well, but without
more information about what you're doing, it's hard to
guess which would apply. You can look through the others
starting from:

http://www.vesa.org/Public/

to find what applies to what you're doing.

--
Later,
Jerry.

The universe is a figment of its own imagination.

jluisky
Guest

Mon Feb 27, 2006 2:32 am   



hi.. check this good page.. this a video timing calculator...

http://www.tkk.fi/Misc/Electronics/faq/vga2rgb/calc.html

I used it to make a driver for vga and ntsc interfaces...

good luke..
luis
mexico

Derek Simmons
Guest

Mon Feb 27, 2006 2:55 am   



I'm looking for a functional spec rather than a timing spec. I remember
reading an article that described some of the functionality of CGA, EGA
and VGA. When most people in this group inquire about a VGA adapter
what they are actually asking for is a frame buffer that generates
video timing signals for a multisync monitor for an IBM PC. I would
like references for the original IBM 256 Kb VGA adapter or something
newer (supporting the new video modes).

I'd really like to hear from somebody that was connected with or has
documentation from TSENG. I seem to remember back in the day their VGA
adapter's, for the cost, were a step a head of the competition.

I'm going to spend the rest of the night reading the documents from the
VESA website.

Derek

Markus Kuhn
Guest

Mon Feb 27, 2006 3:23 pm   



Jerry Coffin <jcoffin_at_taeus.com> writes:
|> > Does any of you knows where can I obtain the VGA specification (I
|> > believes it is IBM's) ?
|>
|> For quite a while now, most video standards have been
|> handled by VESA. To support plain-Jane VGA, they have a
|> set of "fallback" timings to run a monitor at 640x480 or
|> 720x480 at:
|>
|> http://www.vesa.org/Public/SMT/SMT640_720x480V1.pdf
|>
|> If you want to support other resolutions, they have a
|> spreadsheet at:
|>
|> http://www.vesa.org/Public/CVT/CVTd6r1.xls
|>
|> that allows you to enter resolution, refresh rate, etc.,
|> and it calculates timing parameters for you (and verifies
|> whether what you're asking for will be supported by a
|> typical display).

The official VESA list of video timings is a document called

Monitor Timing Specifications -- VESA and Industry Standards
and Guidelines for Computer Display Monitor Timing, Version 1.0,
Revision 0.8, September 17, 1998, dmtv1r08.pdf.
(That's the version I have a copy of, there may well be newer versions.)

Sadly, that seems not to be freely available on the VESA web site.
You may have to order and pay for it.

The DMT standard is in the same format at the SMT document above,
but contains a pretty complete list of all the commonly used VGA
timings. The SMT is basically a 2-page extract of the full DMT list.

What the DMT document does not contain is the electrical and mechanical
specifications for the VGA connector. There seems to be no formal
standard; in fact there seems to be not even strong agreement on
whether full white is represented by 0.7 V ("Euro", VESA),
0.714 V (RS-343) or 1.0 V (RS-170). VESA has AFAIK never fully
formally standardized IBM's 15-pin VGA connector. General wisdom
appears that the RGB lines are 75 ohm impedance, while the sync lines
are TTL (on > 2.4 V, off < 0.5 V at driver, >2.0 V and < 0.8 V at
receiver) with 2 kiloohm termination.

Markus

--
Markus Kuhn, Computer Laboratory, University of Cambridge
http://www.cl.cam.ac.uk/~mgk25/ || CB3 0FD, Great Britain

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