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WTB: Test Equipment - Signature Analyzer

Posted: Wed Nov 28, 2018 10:41 am
by Wailin
Hello

Looking to buy a Signature Analyzer. HP 5004A or similar. LMK if you have something you want to part with

Thomas

Re: WTB: Test Equipment - Signature Analyzer

Posted: Thu Nov 29, 2018 1:51 pm
by mdeslaur
Funny, I was just thinking of writing a sigrok protocol decoder to calculate signatures.

Re: WTB: Test Equipment - Signature Analyzer

Posted: Tue Dec 11, 2018 10:21 am
by Wailin
I'm all ears! What is the plan - maybe use a usb logic analyzer and use 3 channels for start, stop, and clock?

Re: WTB: Test Equipment - Signature Analyzer

Posted: Wed Dec 12, 2018 7:17 am
by mdeslaur
Yep, exactly.

I have one of those $8 Saleae clones off of ebay, and I have a proof of concept python script that calculates the right CRC.

I need to spend some time writing the actual sigrok plugin.

I was about to build a 6502 NOP adapter, but then read that the Atari signatures require a special counter instead built with 2 LS393s, as that increments the addresses once per clock, where as the NOP adapter requires two clocks so the signatures don't match. Though perhaps the plugin can simply have an option to skip every other clock.