Request for information on HP 9826

I got the message below from someone seeking more information about the HP 9826. I'm sure some of you know more about this than I do. He's particularly looking for information about the developement of the 9826. Joe Hi Joe, My name is Tom and my brother, Mark Allen, was one of the developers of the HP 9826. He helped implement RMB for HP and said he invented the knob that was used on that series. My brother passed away a few years ago and I inherited his production prototype of the 9826 which Mark won in a team raffle. I am preparing to donate the 9826 to (a computer museum) and I am looking for more information about it to include with the donation. I found your site in Google (http://www.classiccmp.org/hp/hp9-200.htm) and am surprised to find such detailed information about these old machines. I found your email address at http://www.geocities.com/SiliconValley/Horizon/9107/collectors.htm. Do you have any pointers to more information about the product and the team that developed it? From your descriptions it sounds like you may have worked at HP and may even have known my brother, Mark. Thank you for any information. Warm Regards, Tom