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Hi,
Have you looked at devices like the M8214? Google brought the STMicroelectronics L6229D up in the first 10 results, for some reason... If you want to look through this, National Digital Integrated Circuits, there's a "DM7214/DM8214 TRI-STATE® Dual 4:1 Multiplexer" somewhere in those 640 pages.
A good starting place is to tell us what the IC is part of.
If it's part of a battery charger for example, we would immediately exclude the possibility of it being a video DSP.
Brian.
Given the 1979 date code, it isn't likely to be anything very useful these days.
It certainly isn't an Intel 8214, I think I have some in stock here. The Intel is branded with the 'i' logo and the 8214 was an interrupt prioritizer for the 8080 MCU family. I have some strange things in my storage boxes here!
Almost certainly the 'BTT' is a house code system. When a custom device is made, the number on it is decided by the designer and it rarely if ever follows the coding the same manufacturer uses for generic devices. Being of 1979 date code it could be a small scale memory but unlikely to be more than around 2K capacity and I would think it unlikely to be a complex device. There were no gate programmable devices in that era and the standard MCU was the 8080 and Z80.
There was no "British Telephone and Telegraph" company, at least one involved in electronics, they used the name "Standard Telephones and Cables" or STC but if I remember, their custom devices used STT prefixes.
Brian.