MCM Model 70 Microcomputer (1972)
The MCM/70 was a pioneering microcomputer first built in 1973 in Toronto, Ontario, Canada and released the next year, making it one of the first microcomputers in the world, the second to be shipped in completed form, and the first portable computer. The MCM/70 was the product of Micro Computer Machines, one of three related companies set up in Toronto in 1971 by Mers Kutt. It is considered by some historians to be the first usable personal microcomputer system.
[2018-06-08 Wikipedia MCM/70]
Note the math symbols on the keys. That's for programing APL language.