http://www.zdnet.co.uk/pcmag/flooks/1999/07/r305.html
http://www.celair.com/hp680lxhpcpro.htm
http://www.winmag.com/library/1999/0801/rev0033.htm#HP2
http://www.hpcfactor.com/reviews/hardware/hp/jornada680/
http://www.pdagold.com/hardware/detail.asp?d=1
http://www.usedhandhelds.com/usedhh_learn_hphandhelds.asp
http://h10025.www1.hp.com/ewfrf/wc/product?lc=en&cc=us&docname=bpia2127&dlc=en&product=59950&
BasiCE http://www.tucows.com/preview/32347