1981: TRS-80 Model 1. 16 k RAM. Cassette tape storage. 64 chars x 16 lines of text monchrome monitor . Character graphics 128H x 48V. 1MHz Z-80 processor. Floppy disk storage, RS232, hardware clock, memory expansion to 64 kB max were expensive additions.
Before that Texas Instruments TI-58 programmable calculator - I do nit know if you regard that as a computer.
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1981: TRS-80 Model 1. 16 k RAM. Cassette tape storage. 64 chars x 16 lines of text monchrome monitor . Character graphics 128H x 48V. 1MHz Z-80 processor. Floppy disk storage, RS232, hardware clock, memory expansion to 64 kB max were expensive additions.
Before that Texas Instruments TI-58 programmable calculator - I do nit know if you regard that as a computer.