Re: 6502 with logic sniffer

Hi Jim,

On 2015-01-03 02:48, Jim Brain wrote:
> On 1/2/2015 4:35 PM, Uffe Jakobsen wrote:
>>
>>
>> On 2015-01-02 23:09, didier derny wrote:
>>> The cbm3000 had a relatively short life around 1979/1980
>>>
>>> I'm using this product:
>>> http://dangerousprototypes.com/open-logic-sniffer/
>>>
>>> I give up this product is hell, loosing the usb serial port (need
>>> reboot each time it is disconnected)
>>> The documentation is poor, browsing a lot of web pages to find some
>>> elementary information's
>>>
>>
>> Aah, yes the Open Bench LogicSniffer, I have one of those.
>>
>> Are you using the OLS java GUI ?
>>
>> I have no serial port problems on linux - but guessing from your
>> mail-client I guess that you are on Windows.
>>
>>> Apparently the vhdl code for this specific model is not available
>>> (I wanted to check the .ucf file to find the information I needed)
>>
>> Yes, It seems to closed source - there seems to be no development on
>> its features (and bugs) - it is a dead project.
>>
>> Compared to other commercial LAs its proces is extremely low for up to
>> 32 channels.
>>
>> It has some nice features- up to 200Mhz sampling - *BUT* only 216k
>> sampling memory (not so nice). That is compensated by its ability to
>> do RLE compression of its samples - which often can save you
>> especially with low-frequency retro systems like CBMs where it in
>> theory can stream the RLE samples to the host system "forever"...
> How does that compare to the LWLA1034?  I bought one a few months back,
> but have not done much with it.  It was USD$70.00, so I thought it worth
> a gamble.  It seems to work fine, all channels are 0-5V capable.
>

I've never tried the LWLA1034 - but I've been thinking of getting one.

Looking at their features they are quite similar:
* 32 vs 34 channels
* 200Mhz vs 125Mhz (both more that enough for me)
* external clock input
* external trigger input
* Only OLS seems to have external trigger output

But the LWLA1034 seem a much more real product compared to the DIY state 
of the OLS. The OLS has no casing/enclosure available - it comes with 
only 16 buffered/5volt tolerant channels - the last 16 needs a 
DIY-solder-on extension wing before they become buffered/5volt tolerant. 
The cost of the input buffer wing and finding a suitable enclosure 
almost exceeds the cost of the OLS device it self.
Also the OLS trigger in-/output and clock input does not seem to be 5v 
tolerant at all.

The OLS appears to the host as a USB serial port - that is nice and 
portable - but it sets limitations on the streaming capabilities as the 
max transferrate is 921600 baud - even though RLE compression is applied 
before transmission.

The LWLA1034 seems to present itself as multiple "real" USB end points - 
that will (should) improve its streaming capabilities - but I'm unable 
to see if "endless" streaming is supported by its firmware. But I would 
believe that it is.

Both are low-end and low-cost devices - but I think that the LWLA1034 is 
the clear winner here - you did the right thing Jim :-)

Disclaimer conclusions above are purely teoretical - they are based on 
comparing the specs for the two devices - and my hands on knowledge of 
the OLS device.

Are you using the native GUI for LWLA1034 ? or are you using the sigrok 
source project ?

/Uffe




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