Radio Shack TRS-80 Model 100 Portable Computer, in working condition.Powers up with 6v. DC power supply that is included.Comes in the original kit case (foam is deteriorating), includes:cassette machine (working)acoustic phone couplers (phone to computer connection)Instruction manualRadio Shack additional bookCables About: Processor: 8-bit Oki 80C85, CMOS, 2.4576 MHz Memory: 32 KB ROM; 8, 16, 24, or 32 KB static RAM. Machines with less than 32 KB can be expanded in 8 KB increments of plug-in static RAM modules. An additional 32 KB Option ROM can be installed, for a total of 64 KB of ROM (bank-switched in a 32 KB aperture), and the Standard ROM is socket-mounted (not soldered-in) so is readily replaceable. Display: 8 lines, 40 characters LCD, twisted nematic (gray) monochrome, with 240 by 64 pixel addressable graphics. The screen is reflective, not backlit.[3] The screen was made by Sharp Electronics.[4] The LCD controllers are by Hitachi: (10) HD44102CH column controller ICs and (2) HD44103CH row driver ICs; the HD44102CH's provide the programmable hardware interface to software. The refresh rate is about 70 Hz (coarsely regulated by an RC oscillator, not a crystal). Keyboard: 56 keys, QWERTY layout with full standard spacing, 8 programmable function keys, 4 dedicated command keys, and 4 cursor control keys. These last 16 are tactile "button"-style keys. Almost all keys other than the 16 "button" keys are capable of key rollover (without phantom keys appearing depressed), so multi-key combinations can be used. Peripherals: The basic unit includes: Built-in 300 baud telephone (POTS) modem (North American versions), Centronics-compatible parallel printer port, RS-232 serial communication port (sharing serial I/O chip with internal modem), barcode reader input, cassette audio tape I/O, real-time clock. Expansion: System bus interface DIP socket (under a cover on the bottom of the machine). Dimensions: 300 mm × 215 mm × 50 mm, weight about 1.4 kilograms (3.1 lb) with batteries Power supply: Four penlight (AA) cells, or external power adapter 6V (>180 mA, tip negative configuration)
