TRS-80 History of personal computers

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nov. 1977: trs-80 model i


tandy corporation (radio shack) introduced trs-80, retroactively known model improved models introduced. model combined motherboard , keyboard 1 unit separate monitor , power supply. although pet , apple ii offered features advanced in comparison, tandy s 3000+ radio shack storefronts ensured have widespread distribution neither apple nor commodore touch.


the model used zilog z80 processor clocked @ 1.77 mhz (the later models shipped z80a processor). basic model shipped 4 kb of ram, , later 16 kb, in main computer. expansion unit allowed ram expansion total of 48k. other strong features full stroke qwerty keyboard, small size, written microsoft floating-point basic , inclusion of monitor , tape deck approximately half cost of apple ii. eventually, 5.25 inch floppy drives made available tandy , several third party manufacturers. expansion unit allowed 4 floppy drives connected, provided slot rs-232 option , parallel port printers.


the model not meet fcc regulations on radio interference due plastic case , exterior cables. apple resolved issue interior metallic foil solution not work tandy model i. since model ii , model iii in production tandy decided stop manufacturing model i. radio shack had sold 1.5 million model i s cancellation in 1981.








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