4. TRS-80
TRS-80 is the oldest computer by release date.
More information:
TRS-80 Micro Computer System is a desktop computer. It was launched in 1977 and sold by Tandy Corporation through their stores.
The name is an acronym for Tandy Radio Shack, Z80. The microprocessor used was Z80.
It is one of the most widely manufactured home computers and is sold in bulk at home.