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clueless_engineer (Brett)

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  • clueless_engineer (Brett)
    clueless_engineer (Brett)
    Ahhh - how interesting, thanks!
    clueless_engineer (Brett)
    clueless_engineer (Brett)
    You should post it as a comment on the YouTube video! It's still not giving you hassles with links is it? I can add you as an "approved commenter" or something that should be more lenient.
    GlueLogic
    GlueLogic
    I'll try to in the future. The annoying thing with YouTube is that they don't give any indication your comment has been auto-deleted, so you have to refresh the page a few minutes after posting to see if it's still there. Though it shouldn't be a problem so long as it doesn't trigger the spam filter.
    GlueLogic
    GlueLogic
    It's possible to translate webpages automatically with Yandex Translate.

    (I tried to post this as a comment on the video, but it seems YouTube automatically deletes comments if it thinks there's too many links in them…)
    GlueLogic
    GlueLogic
    I'd guess that the unpopulated section of the PCB is intended for an Intel 8255/КР580ВВ55 parallel I/O interface.

    Despite its name, it seems that the "Baltic" design was most popular in Belarus.
    GlueLogic
    GlueLogic
    There's also some info specifically pertaining to the Astra here: zxbyte.ru/astra.htm

    Apparently, the only difference between the Astra and Baltic is that A0 and A3 on one of the К155РЕ3 ROMS are swapped.
    I thought I'd share some tips for designing keyboard PCBs:
    • The standard spacing between Cherry MX keyswitches is 19.05mm. You can achieve the "staggered" layout seen on most keyboards by using a 4.7625mm grid (1/4 of 19.05mm). In KiCad, the "Edit Grids..." option in the grid selection menu can be used to define custom grids.
    GlueLogic
    GlueLogic
    (Character limit reached...)
    • The footprints for larger keys in the "PCM_Switch_Keyboard_Cherry_MX" library don't have holes for keycap stabilizers, but the footprints in the "Button_Switch_Keyboard" library include the extra holes.
    GlueLogic
    GlueLogic
    • When buying keyswitches, it's best to look for 5-pin switches. These have two extra plastic posts that help with rotational alignment. Depending on the manufacturer, some 5-pin switches will even "friction fit" into the PCB, so it's easier to flip the board over for soldering. (Gateron's 5-pin switches are one example)
    clueless_engineer (Brett)
    clueless_engineer (Brett)
    Oooh, thank you! Yeah, none of the normal electronics retailers I check like Mouser or Digikey list them and even Unicorn Electronics in the US which is good for NOS stuff doesn't list them either. Only ever seen them on a Soviet Spectrum board or on Aliexpress!
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