![The chips in this Ma Bell relay frame logic probe. [4032x3024 - 442KB]](https://pic8.co/sh/v1vLBC.jpg){kind=link}
This was assembled by a company called Halmar Electronics in Columbus. Looks like they may have lasted up until around 1990-91 when Siemens bought the company for certain technologies it had.
This was assembled by a company called Halmar Electronics in Columbus. Looks like they may have lasted up until around 1990-91 when Siemens bought the company for certain technologies it had.
I can't remember whether the plant represents the fab the chip was made in or the assembly plant that packaged the finished device. It was a standardized format all American chipmakers used.
I can't remember whether the plant represents the fab the chip was made in or the assembly plant that packaged the finished device. It was a standardized format all American chipmakers used.