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EEVblog #1334 – Mystery Dumpster Teardown

Mystery dumpster teardown time! With the most amazing mechanical mains power switch you’ll ever see! ...


  1. Hi Dave !

    An interesting teardown of an old mobile phone.
    Back in those days, the SIM cards were full-size, i.e., the size of a credit card.
    I guess the inserted SIM card would activate the momentary switch, and the slide switch was used to eject the SIM card.

    Keep up the good work !

    Best regards,


  2. Fake antenna? Really? Is it possibly a small wire antenna encased in plastic and inductively coupled to the visible coil?

  3. I remember the 68332 well…one of the first chips I worked with that had built in debug capability so didn’t require a megabuck ICE to develop code. Also had a very useful “TPU” (time processing unit), kind of an event co-processor. Ah those were the days…


    P.S. Dave’s right about the fake antenna, it was included because market research concluded that initially customers expected there to be an aerial sticking out the top.

    • I still have one of these phones it was my first Mobile!.
      Worrying to see it ‘s nearly 20 years old( I feel the wrinkles forming 😉 )

      The 68332 was an excellent CPU integrating all those 68K peripherals in a single shot.

      I had the book for the TPU on the 68302, did any one actually use it for more than the memory controller et al, motorola didnt seem to be too forthcoming with the information to program it

    • Hi,
      Does anyone know which processors Motorola used in the MicroTAC 8200 International?


  4. Hmm, ‘video is being processed’..

    …processed into what one wonders…

  5. 68332 is still listed as “Active” on Freescale website. In stock at Digi-Key and Mouser.

    I took apart a Handspring Visor a while back and found one of those.

  6. The AT&T (Lucent) chip was the DSP used for the speech coding.

    • Yeah, back then AT&T did a lot of DSP work. One of my high school jobs was working for… AT&T Microelectronics. Not quite sure who fabbed the chips, but we took in raw processed wafers and carved them up, put them in the packages and then put them on the trays and reels and shipped ’em out.

      The old 68K Macs with the “av” designation (before PowerPC) used AT&T DSPs for video and audio processing.


      In fact, one of the orders we were fulfilling was an Apple one for the DSP3210 (it’s on the lower right hand side of the motherboard photo, the one with the AT&T logo).

      And yes, THAT AT&T.

      That can with the dies on it is probably the RF power amplifier for the transmitter. The wire bonds help tune the output as appropriate for the frequencies in use.

      And no ringtones. Just a beeper.

  7. Front panel PCB with LCD and rubber keyboard looks like simple calculator.

    Is it possible to make a calculator form this part of phone? 😉

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