Can anyone identify these two components, marked "SKY 4433" and "2.000000 K.D.S", respecitvely? Are they capacitors, crystals, or something else? They are from a vintage 1970s ball-and-paddle-style video game (Parat Game by Technigraph) based around the AY-3-8500 chip.

Gray component marked SKY 4433 Gray component marked "2.000000 K.D.S"

  • 1
    \$\begingroup\$ I can't confirm this, but the fact they are placed in such close proximity to a pair of ceramic caps and a tuning cap suggests that they may be early crystal oscillators, probably 2MHz. \$\endgroup\$ Sep 30, 2019 at 7:25

1 Answer 1


Both are crystals. 4.433 MHz is for PAL subcarrier and 2.0 MHz for something else like CPU.

  • \$\begingroup\$ Great! Thanks!! \$\endgroup\$
    – plengqui
    Sep 30, 2019 at 10:56

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