diy vga signal from ram

[mike]

i'm looking for info re. producing vga signal based on contents of ram.
don't want to use pic or fpga, from what i've found so far it looks do-able
with the right clock freq. , some sram and a fistfull of 74XXXXX ic's.
can anyone point me in the direction of some web based gen.?

thanks for any info received..

mike


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[Rich Grise]

On Fri, 24 Dec 2004 07:00:54 +0000, mike wrote:

i'm looking for info re. producing vga signal based on contents of ram.
don't want to use pic or fpga, from what i've found so far it looks do-able
with the right clock freq. , some sram and a fistfull of 74XXXXX ic's.

More like a bushel basket full. )-;

Good Luck!
Rich

 

[Leon Heller]

"mike" <mike@thing.com> wrote in message
news:41cbbefe$0$3113$cc9e4d1f@news.dial.pipex.com...

i'm looking for info re. producing vga signal based on contents of ram.
don't want to use pic or fpga, from what i've found so far it looks
do-able
with the right clock freq. , some sram and a fistfull of 74XXXXX ic's.
can anyone point me in the direction of some web based gen.?

Why bother when you do it with a small FPGA or CPLD, an oscillator module,
three resistors and three diodes.

Leon

 

[Dave Garnett]

see The Cheap Video Cookbook, by Don Lancaster

Dave

"mike" <mike@thing.com> wrote in message
news:41cbbefe$0$3113$cc9e4d1f@news.dial.pipex.com...

i'm looking for info re. producing vga signal based on contents of ram.
don't want to use pic or fpga, from what i've found so far it looks
do-able
with the right clock freq. , some sram and a fistfull of 74XXXXX ic's.
can anyone point me in the direction of some web based gen.?

thanks for any info received..

mike


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[Don Taylor]

"mike" <mike@thing.com> writes:

i'm looking for info re. producing vga signal based on contents of ram.
don't want to use pic or fpga, from what i've found so far it looks do-able
with the right clock freq. , some sram and a fistfull of 74XXXXX ic's.
can anyone point me in the direction of some web based gen.?

thanks for any info received..

I'm groping for the info and I can't put my hands on it but...
I think I remember something in Circuit Cellar in the last year
where someone did this with a surprisingly small number of parts
and fitting into your constraints. I seem to remember that he
saw he could do this in one mode with a couple of counters and
a little glue logic, substantially less than a handful of 74XXXXX.

 

[mike]

"Dave Garnett" <dave.garnett@metapurple.co.uk> wrote in message
news:41cc0a7d$1_2@127.0.0.1...

see The Cheap Video Cookbook, by Don Lancaster

Dave

"mike" <mike@thing.com> wrote in message
news:41cbbefe$0$3113$cc9e4d1f@news.dial.pipex.com...
i'm looking for info re. producing vga signal based on contents of ram.
don't want to use pic or fpga, from what i've found so far it looks
do-able
with the right clock freq. , some sram and a fistfull of 74XXXXX ic's.
can anyone point me in the direction of some web based gen.?

thanks for any info received..

mike

thanks for the lead, i'll look into it.

mike


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[mike]

"Ian Stirling" <root@mauve.demon.co.uk> wrote in message
news:41cc93f4$0$43305$ed2e19e4@ptn-nntp-reader04.plus.net...

Nowadays, you'd almost have to be insane not to do it with programmable
logic of some sort.
Especially for VGA and colour.
The bitrate and required frequencies are high for TTL.

that's all right then, i am almost insane...

mike


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[Rich Grise]

On Fri, 24 Dec 2004 23:18:40 +0000, mike wrote:

"Dave Garnett" <dave.garnett@metapurple.co.uk> wrote in message
news:41cc0a7d$1_2@127.0.0.1...
see The Cheap Video Cookbook, by Don Lancaster

Dave

"mike" <mike@thing.com> wrote in message
news:41cbbefe$0$3113$cc9e4d1f@news.dial.pipex.com...
i'm looking for info re. producing vga signal based on contents of ram.
don't want to use pic or fpga, from what i've found so far it looks
do-able
with the right clock freq. , some sram and a fistfull of 74XXXXX ic's.
can anyone point me in the direction of some web based gen.?

thanks for any info received..

mike

thanks for the lead, i'll look into it.

A TV Typewriter, you can build with a few chips. Even color! ;-)

A VGA, on the other hand, is not a hobbyist project.

Have Fun!
Rich

 

[Ian Stirling]

mike <mike@thing.com> wrote:

"Ian Stirling" <root@mauve.demon.co.uk> wrote in message
news:41cc93f4$0$43305$ed2e19e4@ptn-nntp-reader04.plus.net...


Nowadays, you'd almost have to be insane not to do it with programmable
logic of some sort.
Especially for VGA and colour.
The bitrate and required frequencies are high for TTL.

that's all right then, i am almost insane...

Well, I have occasionally wondered about getting LEGO to sponsor me to
make a mechanical CPU...

 

[Ian]

On 25 Dec 2004 17:45:06 GMT, Ian Stirling <root@mauve.demon.co.uk> wrote:

Well, I have occasionally wondered about getting LEGO to sponsor me to
make a mechanical CPU...

Someone already has a head start on you...

http://goldfish.ikaruga.co.uk/logic.html



--
Ian

'Milk below!'

 

[mike]

"Ian"
<${send-direct-email-to-news1021-at-jusme-dot-com-if-you-must}@jusme.com>
wrote in message news:GCjzd.7439856$6p.1170366@news.easynews.com...

On 25 Dec 2004 17:45:06 GMT, Ian Stirling <root@mauve.demon.co.uk> wrote:

Well, I have occasionally wondered about getting LEGO to sponsor me to
make a mechanical CPU...

Someone already has a head start on you...

http://goldfish.ikaruga.co.uk/logic.html



well, there's no "almost" about that insanity!!

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