Blockbase Pieced Quilt Patterns By the Electric Quilt Co. It's a Block Powerhouse! The same patterns that sold in 1928 for 15 cents each are yours in BlockBase for less than 2 cents apiece! CD-ROM Version of Barbara Book + CD 11 MB free hard disk space 16 MB RAM suggested CD-ROM drive System Requirements:Windows 95/98 BlockBase has virtually every pieced block published from 1836-1970 - over 4000 patterns, ready to print as patterns.