![Ken Shirriff on Twitter: "The chip is from Chris S., who is researching the IBM 3174 establishment controller. Here's the chip on the processor board. The function of this chip is uncertain; it might be a microprocessor implementing IBM's UC.5 controller ... Ken Shirriff on Twitter: "The chip is from Chris S., who is researching the IBM 3174 establishment controller. Here's the chip on the processor board. The function of this chip is uncertain; it might be a microprocessor implementing IBM's UC.5 controller ...](https://pbs.twimg.com/media/Ev50ZU5U8AEt9eA.jpg:large)
Ken Shirriff on Twitter: "The chip is from Chris S., who is researching the IBM 3174 establishment controller. Here's the chip on the processor board. The function of this chip is uncertain; it might be a microprocessor implementing IBM's UC.5 controller ...
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