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TRS-80 Model II

26-4001 · 26-4002 · 1979–1983 · desktop

Specifications

Cpu: Zilog Z80A, 4 MHz
Ram: max: 64 KB · base: 32 KB
Ports: 2x RS-232 serial ports · Centronics-standard parallel port
Display: Built-in 12" monitor, 80x24 text
Storage: base: One internal single-sided 8" floppy drive (500 KB) · options: Up to 3 additional external 8" floppy drives (4-drive configuration)
Os Support: latest: CP/M (third-party support) alongside TRSDOS II · shipped: TRSDOS II in ROM/disk
Release Price: $3,450 (32 KB configuration)

Upgrade paths

RAM

64 KB, a same-generation configuration option rather than a field mod · Sold as distinct 32K and 64K SKUs; RAM chips can be swapped by a technician but this was normally handled as a factory or dealer configuration choice.

~$450 price difference at the time (32K vs 64K configuration)

MODERATE

storage

Up to 4 total 8" floppy drives via the built-in expansion bus · Business-oriented machine aimed at multi-drive office use from the start; expansion was well documented by Tandy itself.

~$1,700 for the 4-drive configuration at the time

MODERATE