On 5/9/06, Przemyslaw Lopaciuk <pic@amusementcity.com> wrote:
> The situation looks like that...
> I've got a board with Intel N80C188. It runs at 24MHz.
> It stores information in NVRAM Dallas DS1225AD-150. So it is CMOS.
> I want to listen to what it is storing in that RAM.
> Boards are connected with ribbon cable. ( BTW do you think that it is a
> good idea to use ribbon cable for that kind of purpose? )

One example where ribbon cable works OK is the fast parallel IDE.
There is no problem if the bust is right terminated (impedance
adapted) on both ends (if it's bidirectional one).
Your problem is not an easy one. It looks like reverse engineering. If
you have full access to the firmware then it's easiest (you may add
loops and check the signal waveform). If you don't have firmware
access then will be very difficult (but not impossible). Without a
logic analyser you could try a good four channel scope and sicronize
it on LSB, WR, RD etc.


> I can only tell that listening to what is going on on that bus is a
> tricky business.

Yaap.

If somebody has some experience with something similar
> I would be very grateful for some knowledge sharing.
>
> Best regards,
> Sam
>
>
>
> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf
> Of Vasile Surducan
> Sent: 09 May 2006 17:24
> To: Microcontroller discussion list - Public.
> Subject: Re: [EE] Circuit isolators...
>
> On 5/9/06, Przemyslaw Lopaciuk <pic@amusementcity.com> wrote:
> > Speed wouldn't be more than 10MHz.
> > Signals are a bus. It is a bus driven by Intel N80C188.
>
>
> You're not very generous with explanations. Which is the lenght, which
> is the technology for bus hardware implementation (cable, dual layer,
> more layers?), does the bus contains sampling clocks ? There are some
> fast timing requirements on that 10Mhz bus ? Could be LVDS, LVTTL, TTL
> or CMOS ?
> I'm too lazy to search for the N80C188, but number looks something old
> or obsolete...
>
> greetings,
> Vasile
>
> >
> > Regards,
> > Sam
> >
> > -----Original Message-----
> > From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
> Behalf
> > Of David VanHorn
> > Sent: 08 May 2006 21:23
> > To: Microcontroller discussion list - Public.
> > Subject: Re: [EE] Circuit isolators...
> >
> > On 5/8/06, Przemyslaw Lopaciuk <pic@amusementcity.com> wrote:
> > >
> > > Hi,
> > >
> > > I need to fully isolate two boards which are connected with 34 PIN
> > > cable. ( one board is mine so I can redesign it ).
> > >
> > > I found some optocouplers but they have only 4 channels so it would
> > mean
> > > putting 8 ICs on board which doesn't seem to be a very good idea.
> > >
> > > Does anybody know any other possible way of isolating these boards?
> >
> >
> > You'll need to say a lot more about what's on those 34 pins.
> > Voltage, current, impedance, frequency, risetime/falltime...
> >
> > Otherwise, just unplugging the cable ought to isolate them quite
> nicely.
> > :)
> >
> > --
> > > Feel the power of the dark side!  Atmel AVR
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