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   ✧✦Catherine✦✧ (whitequark@mastodon.social)'s status on Sunday, 25-May-2025 04:16:53 JST ✧✦Catherine✦✧

   implemented a script for #GlasgowInterfaceExplorer that lets you discover the connectivity of any IC with JTAG boundary scan, provided you can give the IC an arbitrary stimulus (here done by using a glasgow output connected to a needle point probe)

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     ✧✦Catherine✦✧ (whitequark@mastodon.social)'s status on Sunday, 25-May-2025 04:36:09 JST ✧✦Catherine✦✧

     in reply to

     script in question (eventually this will become an applet) https://gist.github.com/whitequark/aa0028915978fd3eb5b19a0e58bb7997

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     ✧✦Catherine✦✧ (whitequark@mastodon.social)'s status on Sunday, 25-May-2025 17:35:53 JST ✧✦Catherine✦✧

     in reply to

     • Henning Paul DC4HP

     @hennichodernich hehe, thank you ^__^

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     Henning Paul DC4HP (hennichodernich@radiosocial.de)'s status on Sunday, 25-May-2025 17:35:54 JST Henning Paul DC4HP

     in reply to

     @whitequark I'm honestly deeply impressed.

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     ✧✦Catherine✦✧ (whitequark@mastodon.social)'s status on Sunday, 25-May-2025 18:36:33 JST ✧✦Catherine✦✧

     in reply to

     spent about 10 minutes to extract 37 nets from a PCB without deprocessing it; I think this is quite good

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     ✧✦Catherine✦✧ (whitequark@mastodon.social)'s status on Sunday, 25-May-2025 19:17:24 JST ✧✦Catherine✦✧

     in reply to

     next up: making it possible to chain two components with JTAG (or just use two JTAG ports) so that their mutual connectivity can be discovered without deprocessing the PCB

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     ✧✦Catherine✦✧ (whitequark@mastodon.social)'s status on Sunday, 25-May-2025 20:05:59 JST ✧✦Catherine✦✧

     in reply to

     the recovered connectivity seems right!

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     ✧✦Catherine✦✧ (whitequark@mastodon.social)'s status on Sunday, 25-May-2025 20:42:58 JST ✧✦Catherine✦✧

     in reply to

     • Phil M0OFX

     @philpem https://1bitsquared.de/products/glasgow-c

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     Phil M0OFX (philpem@digipres.club)'s status on Sunday, 25-May-2025 20:42:59 JST Phil M0OFX

     in reply to

     @whitequark This is extremely cool and makes me want one of these...!

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     ✧✦Catherine✦✧ (whitequark@mastodon.social)'s status on Sunday, 25-May-2025 21:30:37 JST ✧✦Catherine✦✧

     in reply to

     • Lukas

     @karotte yeah!! I'm a big fan of JTAG and Glasgow has a _lot_ of carefully built JTAG functionality; boundary scan just wasn't something I was doing until now because ... BSDL. I wrote a BSDL parser finally and now I can do BSCAN too!

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     Lukas (karotte@chaos.social)'s status on Sunday, 25-May-2025 21:30:38 JST Lukas

     in reply to

     @whitequark So cool to see JTAG boundary scan being used outside of expensive in-circuit testers and the like!

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     ✧✦Catherine✦✧ (whitequark@mastodon.social)'s status on Sunday, 25-May-2025 21:53:09 JST ✧✦Catherine✦✧

     in reply to

     currently disassembling the original bitstream for this thing, which does uh. signal processing

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     ✧✦Catherine✦✧ (whitequark@mastodon.social)'s status on Sunday, 25-May-2025 22:50:14 JST ✧✦Catherine✦✧

     in reply to

     • robryk

     @robryk because something else on the board might object to this by self-destructing

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     robryk@qoto.org's status on Sunday, 25-May-2025 22:50:15 JST robryk

     in reply to

     @whitequark Potentially naive question: why not the other way round (have the IC configure everything as outputs, toggle them at seminrandom, and observe what the probe sees)? Is that not in general possible via JTAG?

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     ✧✦Catherine✦✧ (whitequark@mastodon.social)'s status on Sunday, 25-May-2025 23:15:24 JST ✧✦Catherine✦✧

     in reply to

     • robryk

     @robryk to an extent, yes. but there are two nuances:
     1. you control what you're probing, not just blasting the entire board. in the case in the video, I know there is nothing but the FPGA connected to those nets, therefore it is 100% safe
     2. because of (1), if I put this into an applet and someone fucks up their board, I would not be at fault :)

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     robryk@qoto.org's status on Sunday, 25-May-2025 23:15:25 JST robryk

     in reply to

     @whitequark Doesn't the same apply to the signal you're providing via the external probe?

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     ✧✦Catherine✦✧ (whitequark@mastodon.social)'s status on Monday, 26-May-2025 00:33:38 JST ✧✦Catherine✦✧

     in reply to

     • Synn Fynn :ablobcatneon:

     @synnfynn you're welcome! repurposing e-waste into useful devices is a big part of why glasgow exists (in fact probably over half of what i do with it can be classified that way)

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     Synn Fynn :ablobcatneon: (synnfynn@corteximplant.com)'s status on Monday, 26-May-2025 00:33:40 JST Synn Fynn :ablobcatneon:

     in reply to

     @whitequark

     Thanks. Been looking for a device that could facilitate the modding of old mobile/cell phones that I tear down. Love, love your work. Thank you. :cyberheart_green:

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     ✧✦Catherine✦✧ (whitequark@mastodon.social)'s status on Saturday, 31-May-2025 01:36:03 JST ✧✦Catherine✦✧

     in reply to

     • Crazor

     @crazor 1b2 has them!

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     Crazor (crazor@mas.to)'s status on Saturday, 31-May-2025 01:36:05 JST Crazor

     in reply to

     @whitequark this is absolutely amazing! Now I REALLY need a Glasgow…

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     ✧✦Catherine✦✧ (whitequark@mastodon.social)'s status on Saturday, 31-May-2025 11:49:47 JST ✧✦Catherine✦✧

     in reply to

     • Adam McCombs
     • Synn Fynn :ablobcatneon:

     @nanographs @synnfynn haha!!

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     Adam McCombs (nanographs@chaos.social)'s status on Saturday, 31-May-2025 11:49:48 JST Adam McCombs

     in reply to

     • Synn Fynn :ablobcatneon:

     @whitequark @synnfynn somehow this happens to be mostly what I do with it too lol