Twinhead Corp of Milpitas, California, is shipping its Twinhead Supernote 386SX notebook-size computer that supports drive capacities of 80Mb: it measures 8.5 by 11 by 1.9 and weighs 6.6 lbs with battery and hard disk drive; included as standard are a 3.5 hard disk and a 3.5 1.44Mb floppy drive, 2Mb of memory, and a 640 by 480 pixel 8.75 diagonal VGA LCD display with 32 gray scales; it costs $3,500; a SmartCharge feature enables the computer to be recharged in one hour, while the system is being used, and this feature is said to eliminate the NICad memory problem by using a delta V card inside the brick which senses the feedback from the battery and determines the optimum charging rates; options include memory expansion to 4Mb, an external local area network adaptor, an external modem and floppy drive which plugs into the parallel port, and larger capacity hard drives are also available; Twinhead designed the computer around its 20,000-gate TH4100 AT chip set.