Does anyone have a detailed and annotated SLB-EXT connector documentation image like example, but for all the connectors on the board?
If not, @gwilki et al, are the Altium SLB-EXT files available, or a PDF of the relevant schematic pages for the board+connectors? I’d be happy to create a pinout document, given more detail than the fuzzy silkscreen 
@JPlocher I think that you may be misunderstanding my role, John. I am simply the forum moderator. I don’t work for Sienci. Your best bet is likely to contact Sienci directly to see if such a schematic is available.
I am assuming that posting in a topic named Give us feedback Our hardware, that indeed Sienci employees are directly involved, thus the “et al”
Thank you for letting me know that they don’t participate here.
@JPlocher I didn’t say that at all. I’m sorry if I mislead you. As you will see in the forum, Sienci frequently posts here. That said, this is first and foremost a User Forum.
I’m not sure if the schematics I linked there will help or not. They are for the SLB not SLB-EXT. I think the two boards have much in common. It seems to me that the SLB-EXT docs focus on the differences and rely on the SBL docs for the things in common.
The board layout and connectors are slightly different, thus my request. Here’s what I’m working on, with unknowns called out…
OBSOLETE DIAGRAM REMOVED - See Below for more recent
The PDF is nice so far! It looks like it will be a good resource for AltMill owners when done. Unfortunately I don’t have anything else likely to be of use to you.
Updated board layout, with RCATC and AutoDustBoot wiring (still work in progress, feedback welcome!)
SLB-EXT-Pinout-DRAFT3.pdf (2.4 MB)
(updated with Draft 3 Sept 6, 2025)
Draft 3 includes data from the slb-ext schematics kindly provided by Jason at Sienci Labs, as well as wiring for RCATC plus AutoDustBoot add-ons. As usual, feedback and errata appreciated!
