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Tandy TRS-80 Model I

Tandy · 1977

One of the three machines that started personal computing in 1977, and the one sold through a chain of high-street shops — Radio Shack had three thousand of them, which is how the TRS-80 outsold the Apple II early on. Notoriously radiated so much interference that the FCC took an interest. The expansion interface is the part that goes missing.

As catalogued

Maker
Tandy
CPU
Zilog Z80-1.77
Memory
4K, 16K
Styles
Level I, Level II, Level II with expansion interface
Regions
NTSC (US), PAL (Europe)
Chassis
keyboard unit with a separate monitor
OS
Level I / Level II BASIC

Chips

2
CPU
Zilog Z80A, Zilog Z8400AB1, NEC D780C-1, SGS Z8400AB1, Sharp LH0080A, Mostek MK3880N-4, GoldStar Z8400A, Toshiba TMPZ84C00AP
ROM
Level I BASIC, Level II BASIC

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