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Stuart

Hardware - Cheap Logic Analyser

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For those interested in tinkering with hardware, I bought an 8-channel logic analyser the other day - one of these http://www.ebay.co.uk/itm/130993520591?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649 - for the rather stunning price of ... £10. It's a cheap clone of those made by Saleae (http://www.saleae.com/logic) so you cheekily download their free software, plug in your clone analyser, and off you go.

 

Screenshot below of a TMS9995 going about its business ...

 

post-31406-0-97623400-1395786810_thumb.jpg

 

Stuart.

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Screenshot below of a TMS9995 going about its business ...

 

 

Is this photo from your system? You actually did this and the software is compatible? Hmmmmmm. I LIKE IT!

 

post-31406-0-97623400-1395786810.jpg

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For those interested in tinkering with hardware, I bought an 8-channel logic analyser the other day - one of these http://www.ebay.co.uk/itm/130993520591?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649 - for the rather stunning price of ... £10. It's a cheap clone of those made by Saleae (http://www.saleae.com/logic) so you cheekily download their free software, plug in your clone analyser, and off you go.

 

Screenshot below of a TMS9995 going about its business ...

 

attachicon.gifLogic Analyser.jpg

 

Stuart.

 

Cool, I like it! And that's in a price range I can consider. Now I'm really liking it...

 

Thanks for sharing!

 

-Dano

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Cool, I like it! And that's in a price range I can consider. Now I'm really liking it...

 

Thanks for sharing!

 

-Dano

 

That was the UK eBay with free domestic shipping for them. We still have some decent options though. But with the UK Pound being worth more than the US Dollar (exchange rate), and shipping, we'll be paying more.

 

<< HERE ARE OUR OPTIONS >>

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That was the UK eBay with free domestic shipping for them. We still have some decent options though. But with the UK Pound being worth more than the US Dollar (exchange rate), and shipping, we'll be paying more.

 

<< HERE ARE OUR OPTIONS >>

Welcome to the my TI buying life :(

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I make it easy on myself and just double the pound for a rough estimate.

 

Still completely reasonable for the information one can gather from such an analyzer.

 

Dang it, now I gotta add another thing to my "wanna buy" list. Thanks a lot you guys!#[email protected]$! ;-)

 

-Dano

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You might want to check this video out before buying...

http://www.youtube.com/watch?v=7OCPWCdg2ys

 

I love watching this guys' videos. He's hilarious and actually seems to have some real useful vids. Check out some of his other stuff because he reviews things all the time and seems to be pretty down to earth about their capabilities.

 

Cheers!

 

-Dano

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That's my own video done using my phone cam. I was too lazy to set up the video camera :grin: Just a fun little project which allowed me to play with my old Heathkit scope. I just could not get the setup to work on the digital scope for some reason, but this may have been user error as I see no good reason why it should not work...

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That's my own video done using my phone cam. I was too lazy to set up the video camera :grin: Just a fun little project which allowed me to play with my old Heathkit scope. I just could not get the setup to work on the digital scope for some reason, but this may have been user error as I see no good reason why it should not work...

 

Well good job Walid! I like it! I haven't seen this solution before.

 

My friend loaned me his digital oscilloscope and I've been playing around with it a little bit trying to tackle a few dead boards I have but only being able to watch 2 channels at most is somewhat limiting for logic signals. But, its a start for me since I haven't played with an oscilloscope for, oh, 20 years or so now.

 

Cheers!

 

-Dano

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Bought! Been thinking of something like this but hadn't taken the time to do product research. Thanks for posting and example of one that works for TI study.

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I recommend the Dangerous Prototypes Logic Sniffer:

 

http://dangerousprototypes.com/docs/Open_Bench_Logic_Sniffer

 

It is open source, $50, and designed by a community that supports it. I have one and it works well.

 

I saw that was recommended in the comments section of one those YouTube videos. if you can filter out the trolls in the comment sections of the videos, it's a good resource for alternative options/reviews/real-life use.

 

As much as I'd love to build one like Walid's (which I will still probably do) my time is probably better spent just picking up one that's ready to go.

 

Nothing like having to troubleshoot a problem with a troubleshooting tool you just made. <=- circular reference = Dano's head blowing up.

 

Cheers!

 

-Dano

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As much as I'd love to build one like Walid's (which I will still probably do) my time is probably better spent just picking up one that's ready to go.

 

Here's the schematic if you ever decide to do it. Fun little project :)

Logic Analyzer

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For those interested using a TI-99/4A as a logic analyser, we (TI User Club Mannheim) developed a 16Bit Logic Analyser for the TI in the early 90`s.

It uses a special hardware with a 16-Bit port and of course a 16Bit 32K Memory.

But the hardware is no longer avaiable, so I thought about using only a TI-PIO as an 8-Bit port.

During the last weeks I rewrote the basic routines to support the TI-Pio and modified the measurement routines to 8-Bit only.

 

So have look to the "TI-Spy" an doing some measurements with a "trigger" to start the measurement:

 

 

IMG_0030.jpg

IMG_0028.jpg

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Interesting program, does it work without special hardware, only with the Centronics interface?

 

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You only need a TI-99/4A, 32k and a TI-PIO (or Centronics).  If you have another PIO (Myarc, Corcomp?), I may modify the software.

But I need to know which CRU adress and Cru Bits are used to select the 8Bit port for input.

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