HP-91 OOPs

[rprosperi]

(07-18-2024 05:56 AM)teenix Wrote:  

(07-18-2024 01:35 AM)rprosperi Wrote:  What is the mfg date of the sample you see this in?

1607A03021

Looks like Feb'76

Thanks, and this exactly supports the idea that accepting the card reader in the 91 was in from the beginning, as the case molding was likely one of the longest lead items in production planning,

But another interpretation is they were actually planning to issue the 97 with CR support from the beginning, but as development of that was slow due to the new technologies (CR, programming) they chose to issue the 91 as an interim model to capture some desktop scientific users while finishing the 97.

Either way, I imagine a lot of the earliest 91 buyers were a bit disappointed (ok, pissed off) when the 97 appeared only a few months later. (corrected earlier to later)

Thanks Tony!