hope this helps:
http://www.radioshack.com/ProdSuppo...tailIndex.asp?P=support_computer&D=2512&T=htm
TANDY 2000 (260-5103) Specifications Faxback Doc. # 1941
Dimensions: 19 x 16 x 6 Weight: 26.5 lbs.
Processor: 80186 CPU Speed: 8 MHz
FCC Class: A, UL Listed Wait States: N/A
Add. Device Exp: N/A
# of Slots: 4 (96-Pin Euroconnector) Std. Memory: 256K
MTBF: N/A Max. Memory: 768K
Op. Sys: 2000 MS-DOS Only *Not PC Compatible*
Video: Built-in Mono/Optional Power Supply: 45 to 135 VAC, 60 Hz,
Color 136 Watts
Heat Output: N/A Keyboard: 90-Key Sculptured
Std. Ports: Math Co.: 8087 8 MHz Intel
Monochrome Video-(8 Pin Din) Floppy: 720K 5.25" DS 80 Track
Serial-(DB-25 F) Environment: Operating: 55 to 96 F
Centronics Parallel-(34 Pin Header) Storage:-40 to 160 F
Monochrome Video-(8 Pin Din) Humidity: N/A
CURRENT BIOS ROM Version: 02.00.00 Utilities Version: N/A