Does anyone recognize this chip or manufacturer logo? This chip is believed to be a circa 1990 25 MHz 386DX but the markings are a mystery. The marking at the corner looks familiar (:C I think it's a manufacturer logo) but I can't place it. Can anyone suggest what manufacturer or specific chip this is?

Chip Possible logo
Chip Logo close-up

FWIW, DS was a prefix used by Dallas Semiconductor but the font doesn't seem right for their chips.

For context, the chip is on the board asked about in this question on retrocomputing.se.

  • \$\begingroup\$ Related on retro computing: retrocomputing.stackexchange.com/q/22378 \$\endgroup\$
    – JYelton
    Nov 23, 2021 at 23:28
  • \$\begingroup\$ Might be Centaur Technologies, but they weren't active until 1995. They made embedded X86 type processors if I remember right, but this is just a guess. \$\endgroup\$
    – John D
    Nov 23, 2021 at 23:39
  • 1
    \$\begingroup\$ Thought it might be a Dallas Semiconductor "DS39399" since that laser mark does look similar to the Dallas Semi logo; they were acquired by Maxim Integrated (where I work) which was recently acquired by Analog Devices. But I think I can rule that out; I find a lot of Dallas Semi DS39* parts, but no DS393* parts. Strange that there is both white topmark "DS39399.A 107M7NX" and also nearly invisible laser etch "23996 :C" \$\endgroup\$
    – MarkU
    Nov 24, 2021 at 0:52
  • 2
    \$\begingroup\$ The marking on the chip in the lower right-hand corner is a company logo and indicates that the ceramic substrate was made by Kyocera \$\endgroup\$
    – njuffa
    Nov 24, 2021 at 5:08
  • \$\begingroup\$ 2 additional photos here i.stack.imgur.com/rNbxm.jpg i.stack.imgur.com/P2P1s.jpg \$\endgroup\$ Nov 24, 2021 at 16:17

1 Answer 1


Lower set of number is similar to this AMD part (from this) website:

enter image description here

Also the "logo" in the bottom right corner looks similar. Possibly the Kyocera logo, as @ vurp0 suggests in a comment, who made, and still make, hermetic ceramic IC packages.

enter image description here

  • 1
    \$\begingroup\$ The laser etching and the font match as well. \$\endgroup\$ Nov 24, 2021 at 2:12
  • \$\begingroup\$ That looks a lot like the Kyocera logo in the corner. I don't know what their relation to AMD and this CPU is, though. \$\endgroup\$
    – vurp0
    Nov 24, 2021 at 9:03
  • \$\begingroup\$ @vurp0 Kyocera make ceramic packages, possibly as simple as that. \$\endgroup\$ Nov 24, 2021 at 10:36

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