logic analyzer recommendations

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turboxray
Posts: 64
Joined: Thu Oct 31, 2019 12:56 am

logic analyzer recommendations

Post by turboxray » Mon Dec 09, 2019 2:46 pm

I have a scope, but now I'm looking for a logic analyzer. I'm not sure what I'm looking for, really. What are some recommendations for entry level (this is for 8/16bit retro consoles with signals probably in the 20-50mhz range). What should I aim for and what should I stay away from?

lidnariq
Posts: 9305
Joined: Sun Apr 13, 2008 11:12 am
Location: Seattle

Re: logic analyzer recommendations

Post by lidnariq » Mon Dec 09, 2019 3:02 pm

For cost, it's really hard to beat a bare FX2 IC with Sigrok: https://sigrok.org/wiki/Lcsoft_Mini_Board

Otherwise, find yourself a used mid '90s HP logic analyzer.

creaothceann
Posts: 221
Joined: Mon Jan 23, 2006 7:47 am
Location: Germany
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Re: logic analyzer recommendations

Post by creaothceann » Tue Dec 24, 2019 4:36 am

For signals with a frequency f you need a sample rate of at least f * 2 in the logic analyzer. More = better, obviously. The type of probes matters a lot, too.

https://www.youtube.com/watch?v=dobU-b0_L1I
https://www.youtube.com/watch?v=xZ5wKYnCNcs
https://sigrok.org/wiki/Probe_comparison

I plan to take a look at my SNESes which have 21.477 and 24.576 MHz clocks, so a 100 MHz analyzer should be enough. I ordered a DSLogic Plus though it hasn't arrived yet... You can search on ebay for deals, there's a cheaper version that doesn't have the internal RAM chip soldered in.
My current setup:
Super Famicom ("2/1/3" SNS-CPU-GPM-02) → SCART → OSSC → StarTech USB3HDCAP → AmaRecTV 3.10

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