I've got an old Radio Shack TRS-80
Background
The Model I was first sold on August 3, 1977 at a price of $599.95. It began with a 4K Level I System, which was soon replaced by a 16K Level II System. The Level II (first model) was updated to include a numeric keypad.
The Model I was discontinued in January of 1981 due to its failure to meet the FCC's Radio Frequency Interference rulesd.
Specifications
CPU: Z-80 (1.77 MHz)
RAM: 4K-48K (4K Standard, Expandable to 16K in the Unit - Additional 32K through Expansion Interface)
ROM: 12K
Language: Microsoft Basic (in ROM)
VIDEO: 12" RCA white-on-black monitor (16 lines x 64 characters text; 48 x 128 graphical 'squots')
I/O: 250 Baud (Level I)/500 Baud (Level II) Casette (5 Pin DIN), Video Out (5 Pin DIN), Power (5 Pin DIN), Printer Port (40 Pin Edge Connector)
I/O Option: Expansion Interface which would house a RS-232, Disk Drive Controller, Printer Port, and up to 48K RAM.
I/O Option: 5 MB Hard Drive
I/O Option: Exatron Stringy Floppy
Storage: Casette. Optional 89K Floppy Drive (with DOS) / 102K (without DOS) -- 184K Floppy if Double Density was user installed.
Option: Voice Syntesizer (Radio Shack)
Mine still works A-OK. I still have software on tapes for it.
(check out http://mate.kjsl.com/trs80/ for more info)