Quote:
Originally Posted by Radio Wrangler
HP11C.... "Woodstock" family of calculators, early 1980s
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I'll agree with the date, but the HP11C is a 'Voyager'. The 'Woodstock' family is the HP21, HP22, HP25, HP25C, HP27, HP29C family from the mid-1970s.
The HP11C (scientific) and HP12C (financial) were the first 2 members of the Voyager family to be released, They were later joined by the HP15C (advanced scientific with solve, integrate, etc), the HP10C (cut down scientific, which did not sell well) and HP16C (computer programmer's machine with bit operatons, binary/octal/hex modes, etc).
The Voyagers used the NUT processor, similar to the one in the HP41C series. Alongside it was another chip that contained the ROM, RAM and Display Driver. This was (officially) called R2D2.
The Woodstocks used the ACT processor (Arthmetic, Control and Timing). Most were PMOS. But to make life interesting the HP27 (only) is NMOS, the power rails inside are totally different.