Saturn family calculator performance

[Raymond Del Tondo]

(06-20-2018 11:35 AM)RMollov Wrote:  hp42 looked somewhat "quicker" than hp48s and even hp48g
so it's not the chip only

The "OS" of the 42S is a stripped-down RPL kernel. Stripped-down in that it supports a limited number of object types, and does not support bank-switching.
The stack and status registers are on "fixed" addresses within SYSRAM, as opposed to the unlimited stack on the 48 series, which is a list of pointers, referred to by a pointer.
Nonetheless the 42S features internal user stack access functions in different flavours.