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PICList Thread
'PIC based Digital Storage Oscilloscope'
1998\08\03@125613 by Sean Breheny

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Hello again piclisters,

Well, I finally have a prototype PIC based DSO working! Currently, it
samples at 10MS/s and is untriggered. I am currently looking for
suggestions for improvements that I could add in the second prototype. I
will definately allow a variable sample rate (up to 40MS/s probably), add
triggering (level and slope), have a standard input impedance (1Meg in
parallel with a few pF), and add aditional memory to bring it up to about
64k for the sample buffer. I also hope to make it dual channel.

So, I am asking you to let me know of any additional improvements that
you would like to see, as well as any suggestions on how to implement
them. Some time down the road, I will probably add a logic analyzer to it
as well.


The problem that was keeping it from working had something to do with a
bad cable or bad solder connections on the main board. I never exactly
found out because I just rebuilt most of it and it worked.

The only remaining problem is some high frequency noise on the ADC, but
that may have something to do with the extra long digital lead lengths
that I have sitting right next to the sensitive analog section.

Thanks for the suggestions

Sean

1998\08\05@062818 by Octavio Nogueira

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Could you tell me what ADC you are using?
I'm planning a DSO using one GameBoy.

Regards,

Octavio
======================================================
Octavio Nogueira  - e-mail:   spam_OUTnogueiraTakeThisOuTspammandic.com.br
http://www.geocities.com/~oct_nogueira
"ProPic" Production PIC Programmer Windows under US$20
======================================================
-----Mensagem original-----
De: Sean Breheny <.....shb7KILLspamspam@spam@CORNELL.EDU>
Para: PICLISTspamKILLspamMITVMA.MIT.EDU <.....PICLISTKILLspamspam.....MITVMA.MIT.EDU>
Data: Segunda-feira, Agosto 03, 1998 01:52
Assunto: PIC based Digital Storage Oscilloscope


{Quote hidden}

1998\08\05@091909 by Jan Derogee

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Hello Octavio, Sean,
I read my mail and found the Digital Storage Oscilloscoop related mail.
As I and perhaps many others are wondering are the following questions,
Using a gameboy ? Where did you get the schematics of a gameboy ?
I refer to the following message :

> Could you tell me what ADC you are using?
> I'm planning a DSO using one GameBoy.
>
> Regards,
>
> Octavio



Another question is, what kind of ADC's did you use (are the expensive) and
how do you display your stored information (do you use a none storage
oscilloscoop, do you use a normal T.V. or monitor, do you use a pixel display).
Is your project a secret one or do you like to share it with other electronic
hobbyists. I guess that some of us like to see the schematics (just interested).
I refer to the following message :


{Quote hidden}

1998\08\05@094418 by Stuart Allen

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> [EraseMEPICLISTspam_OUTspamTakeThisOuTMITVMA.MIT.EDU]On Behalf Of Jan Derogee
> Hello Octavio, Sean,
> I read my mail and found the Digital Storage Oscilloscoop related mail.
> As I and perhaps many others are wondering are the following questions,
> Using a gameboy ? Where did you get the schematics of a gameboy ?
> I refer to the following message :
>
> > Could you tell me what ADC you are using?
> > I'm planning a DSO using one GameBoy.
> >
> > Regards,
> >
> > Octavio

This is a brilliant idea. There is a huge amount of information on the net
concerning the GB internals, including full blown development systems, ROM
emulators etc, and the DOS emulator is useful too. Something approaching a
DSO (albeit very simple) might well be possible.

Do you plan to map everything into memory via the cartridge? Is this is
possible? That way you can still play Tetris inbetween debugging sessions.

And when the color Gameboy comes out...

Super Mario DSO. Nice ring.

Keep us up to date,

Stuart.

1998\08\05@112013 by James Merritt

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Hello everyone,

I have not been following the DSO topic very closely, but when I read about
using a GameBoy something clicked in my mind.
I am an electrical engineering student at Iowa State University and about 1 or
2 years ago one of our senior design groups did a project where they were going
to make a cheap DSO or some kind of scope using the Game Boy.  The concept was
that maybe students could have an "affordable" scope for personal use.  I do
not know if it worked or how well it worked but I can get more information if
needed.


--
James E. Merritt N0SRB                  Iowa State University
jemspamspam_OUTiastate.edu                         Center for Nondestructive Evaluation
Electrical Engineering student          x-ray tech/modeller/programmer

1998\08\05@115251 by Ake Hedman

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> not know if it worked or how well it worked but I can get more
> information if
> needed.

YES! Please do.

/Ake

> {Original Message removed}

1998\08\05@131659 by Octavio Nogueira

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{Quote hidden}

Yes, Super Mario DSO would be really cool...
But thinking more seriously, yes I'm planning to map everything on the
cartridge

Regards,

Octavio
======================================================
Octavio Nogueira  - e-mail:   KILLspamnogueiraKILLspamspammandic.com.br
http://www.geocities.com/~oct_nogueira
"ProPic" Production PIC Programmer Windows under US$20
======================================================

1998\08\05@151636 by Dmitry Kiryashov

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Jan Derogee wrote:

> Using a gameboy ? Where did you get the schematics of a gameboy ?
> I refer to the following message :

I'm also interesting to look into gameboy schematics.
I'll be glad to see any information or url related to this topic.

WBR Dmitry.

1998\08\05@153516 by Octavio Nogueira

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The first place to look is:
home.hiwaay.net/~jfrohwei/gameboy/home.html
Regards

Octavio
======================================================
Octavio Nogueira  - e-mail:   RemoveMEnogueiraTakeThisOuTspammandic.com.br
http://www.geocities.com/~oct_nogueira
"ProPic" Production PIC Programmer Windows under US$20
======================================================
-----Mensagem original-----
De: Dmitry Kiryashov <spamBeGonezewsspamBeGonespamAHA.RU>
Para: TakeThisOuTPICLISTEraseMEspamspam_OUTMITVMA.MIT.EDU <RemoveMEPICLISTspamTakeThisOuTMITVMA.MIT.EDU>
Data: Quarta-feira, Agosto 05, 1998 04:16
Assunto: Re: PIC based Digital Storage Oscilloscope


{Quote hidden}

1998\08\05@223255 by ssj

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> To satify all of your interests in Gameboy, here is:

           http://hiwaay.net/~jfrohwei/gameboy/I also developed an DSO
based on the old 8031, it's still not finished yet, i've used the
ADC0804,but you guess the "speed" of that ADC...
A gameboy have complex hardware, more than needed for this application,
the 8051 is too slow
to acomplish a practical DSO (50KHz max), i think if an 'C74 could do
this job better.
I wrote the complete BIOS (I/O graphical routines triggering and so on)
and it used only 3Kb!
A 'C74 can handle 4 channels with no additional hardware, only a opamp,
the main problem is memory storage. (that's why i choose the 8031)
I saw an handwritten schemactic of a flash ADC with FIFO and some gate,
it can do 20MHz real DSO,
if you are interested, i can post it here or on more apropriate place.

Regards

> > Using a gameboy ? Where did you get the schematics of a gameboy ?
> > I refer to the following message :
>
> I'm also interesting to look into gameboy schematics.
> I'll be glad to see any information or url related to this topic.
>
> WBR Dmitry.

1998\08\06@022507 by mermin

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part 0 2480 bytes
<P>&nbsp;&nbsp; <A HREF="http://www.komkon.org/fms/GameBoy/">http://www.komkon.o
rg/fms/GameBoy/</A>

<P>where you can find schematics and software to develop applications on
GB

<P>bye
<PRE>--&nbsp;
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</x-html>

1998\08\06@023515 by Dr. Imre Bartfai

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Hi,
please talk us if the DSO project ready. Can I use it to upgrade my
one-channeled analogue oscilloscope?

Imre

On Wed, 5 Aug 1998, Dmitry Kiryashov wrote:

{Quote hidden}

1998\08\06@145455 by Sean Breheny

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Hello all,

I've been busy at work and haven't had time to respond to the DSO thread.
My DSO project is not yet completed. A good deal of work needs to be done
before it is ready for others to build (it is not triggered yet, has
noise problems, etc.). I will be sure to let you all know when it is ready.

In the mean time, I will put a schematic of the current prototype on my
web page when I get a chance.

I like the gameboy idea, but I don't have one, and besides, for right
now, my project is a PC based one (the waveform is displayed on a PC, and
all waveform math etc. will be done by PC). eventually, it may go to
another platform, possibly the gameboy, and certainly I would be happy if
anyone ported it to that platform. It sounds really goofey, but it might
work <G>.

well, I've got to get back to work. A block diagram, a picture of part of
the prototype, and some info (and soon a schematic) are at

http://www.people.cornell.edu/pages/shb7/posc.html

But again, it is not ready to be built by others yet, but if anyone can
get ideas from it, they are more than welcome.

Sean


On Thu, 6 Aug 1998, Dr. Imre Bartfai wrote:

{Quote hidden}

1998\08\06@155036 by craiglee

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Well I just made a trip down to the local Toys R Us, and I can pick up
a Gameboy and a printer for $120CAN.

This would make a hell of a cheap tool! .... and who cares how accurate
it is.  The HP Dart, which is similar to the proposed project is $1000
US!!!!
... and that doesn't include a printer! (...and you can't play Fudgeman on
it either)

I think you'all are on to something. I'll mention it to one of my guys who
built a PC based one in college when he's free.

Is there a cross compiler for the Gameboy?  Is it motorola or pic based?
Does
it have some custom graphics chips, or is it a single proc?  Anybody written
drivers?

Craig



{Original Message removed}

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