HHC2021 Bob's Calculator Challenge

[Jake Schwartz]

(10-08-2021 12:24 PM)rprosperi Wrote:  

(10-08-2021 07:04 AM)KimH Wrote:  I had 2 - #1 (odd one to know) and the long list of “unused” model-numbers, 44 was what got my attention there.

On the shortest lifespan, I had 28C - I recall it was about 12 months between the C and the S. Can’t find a list anywhere with intro- and obsoletion dates. I am sure one exist, but don’t know where.

Fun video to play along with, thanks Bob!

Checking... The 28C was officially available Jan 87 - Feb 88, so 14 months and thus this ties with the HP-70. Probably the 28C was not discontinued until February to allow enough time for the new 28S (introduced in January) to fill the channel.

Good call Kim!!

I am learning so much here!

On the other hand, I saw the 18C at the 1986 CHIP special meeting in Chicago on 5/30/86 where HP's Janet Cryer and Nancy Ullman introduced it and also Rick Furr's poster confirms "6/86". Also, CHHU Chronicle V3N1P9 lists the HP Press Release, dated June 1, 1986.

Jake