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Comment by stephc_int13

64 bits registers on such a small and slow (1Mhz, 4bits) CPU was unexpected.

I really loved learning how to push this little gem to its limits, so many tricks were possible with the weird addressing schemes.

(I wrote a hobby OS for the HP48 series when I was a student)

https://www.hpcalc.org/hp48/apps/shell/

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