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? ) I can only tell that listening to what is going on on that bus is a tricky business. 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 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 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 > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist