Compaq Computer today introduced a line of scanners that includes a combination scanner, color printer, fax machine and copier. The all-in-one unit, the A1500, prints at a resolution of 2,400 dots per inch (dpi). The A1500 goes on sale in November and will sell for $299. Two flatbed scanners, the C1000 and S100, also will be available in November for $249 and $99, respectively. The S100 is a 42-bit color scanner with a resolution of 1,200 dpi.