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'Monitors'
1997\08\30@182444 by Leon Heller

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In message <spam_OUTPine.LNX.3.95.970829183843.15703A-100000TakeThisOuTspamalphax.com>,> Mailing List Account <.....mlistKILLspamspam@spam@ALPHAX.COM> writes
>        How difficult is it to use a monitor with a microcontroller or
>microprocessor?  As an example i'd like to use a VGA monitor, in 320x200,
>black and white (and eventually color), I couldn't find any schematics at
>all, do I need a CRT controller or can I do it all from a micro?

You can do it with a CPU, a handful of TTL/CMOS chips and some SRAM, as
was done with the early home computers like the TRS-80 which I had.
These days I'd be inclined to do all the logic in something like a
Lattice CPLD (they have an application note describing a fairly
sophisticated graphics controller). I've been thinking of doing
something like this myself. Don Lancaster wrote a couple of excellent
books about building your own computer video system that you might be
able to find in a library. There's always the ClockPIC software for the
16C84, which simply uses the PIC and three resistors as a DAC, to
generate composite video for a mono TTL monitor, giving a large-format
clock display. I tried it the other day, and it works quite well. This
might give you some ideas.

Leon
--
Leon Heller: leonspamKILLspamlfheller.demon.co.uk http://www.lfheller.demon.co.uk
Amateur Radio Callsign G1HSM    Tel: +44 (0) 118 947 1424
See http://www.lfheller.demon.co.uk/rcm.htm for details of a
low-cost reconfigurable computing module using the XC6216 FPGA

1997\08\30@182539 by Andy Kunz

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At 06:41 PM 8/29/97 -0700, you wrote:
>        How difficult is it to use a monitor with a microcontroller or
>microprocessor?  As an example i'd like to use a VGA monitor, in 320x200,
>black and white (and eventually color), I couldn't find any schematics at
>all, do I need a CRT controller or can I do it all from a micro?

The Timex/Sinclair machines did it with the CPU, but I recommend getting a
cheap VGA chip.  C&T has VGA/LCD combo chips that are very suitable.

Andy

==================================================================
Andy Kunz - Montana Design - 409 S 6th St - Phillipsburg, NJ 08865
         Hardware & Software for Industry & R/C Hobbies
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==================================================================

1997\08\30@182659 by Dorin Dogaroiu

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>        How difficult is it to use a monitor with a microcontroller or
>microprocessor?  As an example i'd like to use a VGA monitor, in 320x200,
>black and white (and eventually color), I couldn't find any schematics at
>all, do I need a CRT controller or can I do it all from a micro?

You need a CRT controller ( single chip or made from pieces ), a memory
frame buffer and a microcontroller for managing the displayed data.
You cannot do all the functions needed using only the microcontroller,
because it doesn't have enough speed ( even a fast processor cannot generate
directly video signal for the monitor  )


                                       Dorin

---------------------------------
Dorin Dogaroiu
Research Institute for Computers
Bucarest, Romania
Email : .....dogaroiudKILLspamspam.....pcnet.pcnet.ro
       EraseMEddorinspam_OUTspamTakeThisOuTkappa.ro
---------------------------------

>
>Thanks,
>Philip Lalone
>
>

1997\08\30@205759 by Lee McLaren

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Leon,
Do you have a link for the clockPic?

Thanks
Lee McLaren



Leon Heller wrote:

<snip>
> There's always the ClockPIC software for the
> 16C84, which simply uses the PIC and three resistors as a DAC, to
> generate composite video for a mono TTL monitor, giving a large-format
> clock display. I tried it the other day, and it works quite well. This
> might give you some ideas.
>
> Leon
> --

1997\08\30@210629 by William Chops Westfield

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   >        How difficult is it to use a monitor with a microcontroller or
   >microprocessor?  As an example i'd like to use a VGA monitor, in 320x200,

   The Timex/Sinclair machines did it with the CPU, but I recommend getting a
   cheap VGA chip.  C&T has VGA/LCD combo chips that are very suitable.

Hmm.  Unless space is a serious concern, I'd recomend a cheap vga *CARD*.
All you have to do is figure out how to simulate a piece of ISA bus.

BillW

1997\08\31@041206 by Scott Newell

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>Hmm.  Unless space is a serious concern, I'd recomend a cheap vga *CARD*.
>All you have to do is figure out how to simulate a piece of ISA bus.

Can you run the basic VGA modes without the on-card bios?

What's in the VGA bios anyway?  Start-up code and the video interrupt
handlers?


later,
newell

1997\08\31@045400 by Leon Heller

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In message <3408C0D2.93EEF653spamspam_OUTtrumpet.com.au>, Lee McLaren
<@spam@lmclarenKILLspamspamTRUMPET.COM.AU> writes
>Leon,
>Do you have a link for the clockPic?
>


I thought I got it from David Tait's web site, but someone said that
they couldn't find it there. Try a web search, if that fails, I can
email it to you. It's quite small. I tried it the other other day, it
works, but isn't very much use. Interesting, though, to see what can be
done with minimal hardware.

Leon
--
Leon Heller: KILLspamleonKILLspamspamlfheller.demon.co.uk http://www.lfheller.demon.co.uk
Amateur Radio Callsign G1HSM    Tel: +44 (0) 118 947 1424
See http://www.lfheller.demon.co.uk/rcm.htm for details of a
low-cost reconfigurable computing module using the XC6216 FPGA


'Monitors'
1997\09\01@032414 by Pasi T Mustalahti
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On Sun, 31 Aug 1997, Leon Heller wrote:

> In message <RemoveME3408C0D2.93EEF653TakeThisOuTspamtrumpet.com.au>, Lee McLaren
> <spamBeGonelmclarenspamBeGonespamTRUMPET.COM.AU> writes
> >Leon,
> >Do you have a link for the clockPic?
> >
>
>
> I thought I got it from David Tait's web site, but someone said that
> they couldn't find it there. Try a web search, if that fails, I can
> email it to you. It's quite small. I tried it the other other day, it
> works, but isn't very much use. Interesting, though, to see what can be
> done with minimal hardware.
>
PTM: Could you please make it somehow wisible in the WWW.


> Leon
> --
> Leon Heller: TakeThisOuTleonEraseMEspamspam_OUTlfheller.demon.co.uk http://www.lfheller.demon.co.uk
> Amateur Radio Callsign G1HSM    Tel: +44 (0) 118 947 1424
> See http://www.lfheller.demon.co.uk/rcm.htm for details of a
> low-cost reconfigurable computing module using the XC6216 FPGA
>

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1997\09\01@062617 by STEENKAMP [M.ING E&E]

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Hi,

>         How difficult is it to use a monitor with a microcontroller or
> microprocessor?  As an example i'd like to use a VGA monitor, in 320x200,
> black and white (and eventually color), I couldn't find any schematics at
> all, do I need a CRT controller or can I do it all from a micro?
>
It should be quite possible.  As far as the monitor is concerned, there
is no such thing as resolution.  You only have to generate the correct
horizontal en vertical sync signals.  Between the horizontal sync pulses
you apply an analog voltage to the RGB input of the monitor and that
gets displayed.  If you divide this time into 16 sections, you have a
horizontal resolution of 16 pixels (blocks, rather!).  You can thus design
your own resolution.  The monitor does have different vertical scan rates
(refresh rate) which is selected by the polarity and timing of the sync
pulses.
So if the stuff you want to display is not complex or can be computed,
then you don't need large frame buffers and stuff like that.

Hope this helps
Niki

1997\09\01@145457 by Antti Lukats

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At 10:21 AM 1/9/97 +0300, you wrote:
>On Sun, 31 Aug 1997, Leon Heller wrote:
>
>> In message <EraseME3408C0D2.93EEF653spamtrumpet.com.au>, Lee McLaren
>> <RemoveMElmclarenEraseMEspamEraseMETRUMPET.COM.AU> writes
>> >Leon,
>> >Do you have a link for the clockPic?
>>
>PTM: Could you please make it somehow wisible in the WWW.

didnt find the link so uploaded

ftp://sistudio.com/pub/mchip

antti
AVR Basic Light NOW Available - Look for September Specials
http://avrbasic.com    Free AVR Basic Compiler Demo Edition

1997\09\02@020225 by Leon Heller

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In message <RemoveMEPine.SV4.3.96.970901102101.27376N-100000spam_OUTspamKILLspamantares.utu.fi>,> Pasi T Mustalahti <RemoveMEptmustaTakeThisOuTspamspamUTU.FI> writes
>On Sun, 31 Aug 1997, Leon Heller wrote:
>
>> In message <EraseME3408C0D2.93EEF653spamspamspamBeGonetrumpet.com.au>, Lee McLaren
>> <RemoveMElmclarenKILLspamspamTRUMPET.COM.AU> writes
>> >Leon,
>> >Do you have a link for the clockPic?
>> >
>>
>>
>> I thought I got it from David Tait's web site, but someone said that
>> they couldn't find it there. Try a web search, if that fails, I can
>> email it to you. It's quite small. I tried it the other other day, it
>> works, but isn't very much use. Interesting, though, to see what can be
>> done with minimal hardware.
>>
>PTM: Could you please make it somehow wisible in the WWW.


I've put it on my web site - look for:

       http://www.lfheller.demon.co.uk/clockpic.htm

Leon
--
Leon Heller: leonSTOPspamspamspam_OUTlfheller.demon.co.uk http://www.lfheller.demon.co.uk
Amateur Radio Callsign G1HSM    Tel: +44 (0) 118 947 1424
See http://www.lfheller.demon.co.uk/rcm.htm for details of a
low-cost reconfigurable computing module using the XC6216 FPGA

1997\09\02@084119 by paulb

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Hello Philip.

>  How difficult is it to use a monitor with a microcontroller or
> microprocessor?  As an example i'd like to use a VGA monitor, in
> 320x200, black and white (and eventually color), I couldn't find any
> schematics at all, do I need a CRT controller or can I do it all from
> a micro?

 Well, you have had various answers and most quite correct, even if
they appear to say opposite things.

 It is a good example of asking the wrong question.  It would have been
better asked:  "I wish to implement an xxxx for use in a yyyy with the
following specifications: (... ... ... ...).  How easy is it to use a
microntroller or what pre-built assemblies would do the job cheaply?"

 Cheers,
       Paul B.         (Used to dabble in terminal implementations!)

PS: 320 by 200 is CGA, not VGA  LOTS of used monitors floating about!

1997\09\03@002748 by nafpoc

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Leon Heller wrote:
{Quote hidden}

Leon the link to your home page clockpic.htm does not work, your
principal page its ok but the clockpic its not there, when you figure
out whats wrong please send a e-mail so we can try again to download.

Thanks

Pablo
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1997\09\03@050022 by Leon Heller

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In message <TakeThisOuT34217063.3C01.....spamTakeThisOuTmail.giga.com>, "Ing. Pablo Otero"
<TakeThisOuTnafpocKILLspamspamspamRAZA.GIGA.COM> writes
{Quote hidden}

Sorry, I uploaded the HTML file, but forgot to upload the actual
clockpic file. I've just uploaded it.

Leon
--
Leon Heller: RemoveMEleonEraseMEspamspam_OUTlfheller.demon.co.uk http://www.lfheller.demon.co.uk
Amateur Radio Callsign G1HSM    Tel: +44 (0) 118 947 1424
See http://www.lfheller.demon.co.uk/rcm.htm for details of a
low-cost reconfigurable computing module using the XC6216 FPGA

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