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On 2/19/2013 3:02 PM, yoda wrote:
Douglas
I know that you have already bought the 8 bit one but the can
do 32 bits and is cheaper than the Saleae 8 bit analyzer.
I wasn't aware the OWL could do 32 channels. That is a huge reason
for me to know more about it.
Does It's software work on the Mac?
Ah!! I remember looking at this now. I believe the specs say only 16
of the channels are 5v tolerant. That would be ok for
newfangled SoC's but not good for our N8VEM work. Have I got this
wrong?
I have the 16 bit Saleae as well as a 34 bit one from
Intronix.
I can see that you also have been on a quest for the best logic
analyzer, one with a good mixture of price, speed, and channels.
I paid what I consider a lot for my Hantec 34 channel analyzer, and
I haven't been entirely happy with it. The probe cable that came
with it didn't seat well in the connector on the unit, and flakey
results were troublesome. Since then I have come up with a better
cable solution and things should be better. Unfortunately the
software is Windows only, and I just cannot bring myself to load
Windows software onto my Mac, whether bootcamp or Parallels.
I will give my assessment when mine arrives but I looked at
the code for this one as it is open source and the person who
did the latest implementation of the code for the FPGA seems to
really know what he is doing.
Are you saying your OWL has yet to arrive
The client interface does not look bad either but I have not
been able to look at the trigger setup because in test mode you
can not get to those settings. I know more inputs are desirable
but the cost goes way up for more than this.
In general I only use less than 8 but at times more can be
useful - my driving force is that it not be tied to windows and
give me high enough sampling rates when I need it.
I have to admit a large part of my affection for the Saleae is that
it has a client for the Mac, and I can use it with my 46" display.
Easier to see for someone with older vision.
On Tuesday, February 19, 2013 4:31:18 PM UTC-6, douglas_goodall
wrote:
Ronald and yoda,
I agree, and a four channel logic analyzer is most a
tease. Eight can be helpful, 16 is much better and 34 is
really grand but still about a half dozen short to
everything you might want to see at once. 8 databits, 16
address bits, at 8 control lines, phi(clock), M4, rd, wr,
iorq, memrq,, a few chip selects. they add up fast. Still
if you keep tight focus, 8 can do a lot for you. It is a
shame that the Saleae 16 channel unit is $300. The Saleae
user interface is the most intuitive of any I have used so
far. The serial analyzers built into some of the logic
analyzers are great as well.
Douglas
On 2/19/2013 1:09 PM, yoda wrote:
Well I think you are just seeing
noise - the CPU pin should be 4MHz not 50Hz - I assume you
are in country with 50 Hz AC voltages so you are just
picking that up. Regarding the analyzers - I think the
Open Workbench Logic Sniffer would be better - you should
download the client and have a look - pretty simple to use
and when you get used to it or need it, it will have much
more capabilities than the Sanalogic and is actually
cheaper from what I can see from the web page.
So it seems if you trust the multimeter then you have
no CPU clock and that will most certainly not work.
On Tuesday, February 19, 2013 2:18:46 PM UTC-6,
rbruinsma wrote:
Op dinsdag 19 februari 2013 03:29:08 UTC+1 schreef
Sergey het volgende:
That is very similar
multimeter to one I have. Yes, the frequency (Hz)
and duty cycle (%) measurements can be useful to
detect pulses.
It looks like your multimeter can measure frequency
of up to 5 MHz.
Which is should be more than enough for measuring
signals on a 4 MHz
(or a 1.8432 MHz) clocked Z80. You can test it first
by measuring
frequency on Z80 CLK input (pin 6). When you can try
measuring
frequency on A0 and /MREQ. If I remember correctly
/MREQ frequency
will be about 1/4 of the CLK frequency, and A0 is
about 1/8 of CLK
frequency (assuming that Z80 executing NOPs).
Sometimes you might get a 50 Hz (or 60 Hz for US and
few other
countries) reading, it probably means that one of
the leads is
floating / not connected, or a device under test has
a pin in high
impedance state. This reading is the mains frequency
that is received
by the multimeter leads :-)
Thanks,
Sergey
Strange things are happening over here ;) when I
use the multimeter with the Hz option I get 49.98Hz
on the CPU pin, so far so good. But after that every
pin I tough on the Z80 will give me the same 49.98Hz
reading??
I did a lot of reading on this forum and I think I
need a logic analyzer to proceed debugging. Because
I don't have a big budget to spend on a logic
analyzer I think I have two options:
- Open Workbench Logic Sniffer that Dave suggested
in this thread
- Sanalogic http://www.ikalogicstore.com/product.php?id_product=11
The last one does have user friendly software, since
I'am quit new to this all I think this would be my
best bet. Do you have any ideas about this?
Thanks!
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