Which HP calculator had "The New Accuracy" first?

[Jonathan Busby]

I'm kinda out-of-the-loop on pre-Saturn HP Calculators, but I do believe that the HP-71B was the first to implement the IEEE Std 854-1987 radix-independent floating point standard.

Also, according to this page, William Kahan made many contributions to the floating point algorithms used on HP Calculators, although I'm not sure if any used the Kahan summation algorithm.

Kind of off-topic, but I'd like to see an RPN and/or RPL calculator that uses DEC64 which seems to have all the advantages of binary floating point's extended significand and exponent range while still retaining BCD / decimal floating point's accuracy and is also faster than both for good measure

Regards,

Jonathan