Sorry, this is a little OT but I just got a TRS-80 Model 1 and when looking inside, I see 8 chips that are MCM6616L6.
When searching for those chips, I cannot find much of anything. Especially a datasheet.
I assume the 66
16 section means 16 Kb. As in, 16,384 bits (2 KB). But that doesn't sound right because I believe all TRS-80's had at least 4 KB.
I've never claimed to understand how DRAM works.
Also, notice the date code! I think these are literally the oldest electronic components I have. It's certainly the oldest computer I have (7937).