Everyday Practical Electronics are doing a PIC dual-chan virtual scope by John Becker. October 2000. Which has been talked about on the list the frequency range is nominal audio below 1kHz to over 10kHz. The ram chips used are 32k 75ns, the pic is a 16C877-20 but running at only 5mHz. Jinx I think was talking about using 15n cache chips and what if you up the speed to 20mHz. could this extend the range to 40-50mHz? But the point I'm trying to make is the software and code for the PIC is down loadable from their website http://www.epemag.wimborne.co.uk plus lots of other projects like the MicroPICscope design very much like the above but using PIC16C876-20 still running at 5mHz ;-(... But the display used is a 16x2 line Lcd. showing Waveform pixels, Rate ? Frequency and Amplitude. This is a Project I will take bits out of a very good learning execise. Regards Art ----- Original Message ----- From: M. Adam Davis To: Sent: Monday, October 02, 2000 2:57 PM Subject: Re: [EE]: Oscilloscope > It is a 1MSPS device, so the effective bandwidth for analog signals is around > 200kHz. > > You can check out the specs at: > http://www-ev.phy.cam.ac.uk/Homepages/Steve/Gameboy/DsoDemo/DsoDemo.htm > > -Adam > > James Paul wrote: > > > > All, > > > > Does anyone know what the expected or effective bandwidth of this > > DSO is? or is supposed to be? If it is less than 1 Mhz, it really > > isn't practical for much of anything except novelty. If it's >1 Mhz > > but less than 50 Mhz, it should be useful for audio and some non > > critical higher frequency signals. Ideally, it would be at least 50 > > Mhz, but I reaaly doubt that a game machine that costs <$75.00 or so > > is going to be able to handle that speed. Anyway, just curious. > > > > Regards, > > > > Jim > > > > On Mon, 02 October 2000, Bob Ammerman wrote: > > > > > > > > > > > > > > The question is being avoided: > > > > > > Can one _legally_ copy that EPROM? > > > > > > This isn't really a question of morality or Elektor's business practices. > > > > > > > > > > > > Bob Ammerman > > > RAm Systems > > > (contract development of high performance, high function, low-level > > > software) > > > > > > ----- Original Message ----- > > > From: Michael Rigby-Jones > > > To: > > > Sent: Monday, October 02, 2000 7:53 AM > > > Subject: Re: [EE]: Oscilloscope > > > > > > > > > > > > >build them. I really hope they are going to do a PCB for this. The > > > > > only > > > > > > >downside is I can almost guarantee that the code will not be > > > published, > > > > > you > > > > > > >will have to buy a pre-programmed eprom from them. > > > > > > > > > > > > As the code is in a 27256 series eprom you should need to buy only one > > > > > and share the cost among the group of mates all wanting to build it. It > > > > > does not use any micro on the ROM board that makes the gameboy into an > > > > > oscilloscope - it uses the gameboy processor as a DSP. > > > > > > > > > > > > > > > -----Original Message----- > > > > > From: Martin Hill [SMTP:eaxmjhi@NOTTINGHAM.AC.UK] > > > > > Sent: Monday, October 02, 2000 1:38 PM > > > > > To: PICLIST@MITVMA.MIT.EDU > > > > > Subject: [EE]: Oscilloscope > > > > > > > > > > Is this code available for free? If not, then isn't what you are > > > > > suggesting just what people complain about everytime somebody > > > > > asks how to get around the code protection on a PIC? Apologies if > > > > > I have got the wrong end of the stick. > > > > > > > > > > Martin > > > > > > > > > I guess (as with the PIC thing) it depends on what side of the fence you > > > are > > > > sitting on. Elektor obviously want to make as much money as they can out > > > of > > > > the article, and therefore charge a small fortune for the PCB and a > > > > pre-programmed EPROM. However, as a (potential) constructor, I think it's > > > a > > > > little short sighted no to publish the code. Building a project such as > > > > this should be fun and have at least some kind of educational value, > > > > otherwise there's not a lot of point in building it. Certainly the specs > > > of > > > > the scope, coupled with the cost of a Gameboy if you don't have one > > > wouldn't > > > > IMO make it worth building for use as a serious tool. I suspect > > > publishing > > > > the code wouldn't make a huge dent in their chip sales, a lot of amateurs > > > > who may be tempted to build this will not have sutiable programmers, but > > > > having the code available makes the investment in building the unit far > > > more > > > > worthwhile. As well as learning from code you have the possibility to > > > > modify it for your own requirements, or to improve it. > > > > > > > > I personally think that although Elektor is generaly a quality magazine, > > > by > > > > their business decisions they aim these kind of projects above the heads > > > of > > > > most amateurs. > > > > > > > > Mike > > > > > > > > -- > > > > http://www.piclist.com#nomail Going offline? Don't AutoReply us! > > > > use mailto:listserv@mitvma.mit.edu?body=SET%20PICList%20DIGEST > > > > > > > > > > > > > > -- > > > http://www.piclist.com#nomail Going offline? Don't AutoReply us! > > > use mailto:listserv@mitvma.mit.edu?body=SET%20PICList%20DIGEST > > > > jim@jpes.com > > > > -- > > http://www.piclist.com#nomail Going offline? Don't AutoReply us! > > use mailto:listserv@mitvma.mit.edu?body=SET%20PICList%20DIGEST > > -- > http://www.piclist.com#nomail Going offline? Don't AutoReply us! > use mailto:listserv@mitvma.mit.edu?body=SET%20PICList%20DIGEST > > -- http://www.piclist.com hint: PICList Posts must start with ONE topic: "[PIC]:" PIC only "[EE]:" engineering "[OT]:" off topic "[AD]:" ad's