✓ VERIFIED
TRS-80 Model I
26-1002 · 1977–1981 · desktop
Specifications
- Cpu
- Zilog Z80, 1.77 MHz
- Ram
- max: 48 KB with a Tandy Expansion Interface · base: 4 KB
- Ports
- Cassette in/out · Expansion Interface bus connector · Built-in monitor (integrated, not a separate port)
- Display
- Built-in monochrome monitor, 64×16 text (32×16 in wide mode), block graphics
- Storage
- base: Cassette tape via a standard cassette recorder (no internal storage) · options: 5.25" floppy disk drive(s) via the Expansion Interface
- Os Support
- latest: TRSDOS with Level II (Microsoft) BASIC · shipped: Level I BASIC in ROM
- Release Price
- $599.95 (with monitor and cassette recorder)
Upgrade paths
RAM
48 KB via the Tandy Expansion Interface · The Expansion Interface is a separate box that sits under the keyboard unit, adding RAM up to 48 KB, a floppy controller, and a real parallel printer port.
MODERATEstorage
Up to 4 external 5.25" floppy drives via the Expansion Interface's disk controller · Turned a cassette-only machine into a disk-based system, the configuration most Model I software libraries assumed.
MODERATELoading
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