HP 42S: Difference between revisions

HP 42S (edit)

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 [[Category:Dot-Matrix LCD| ]]
 [[Category:RPN| ]]
-The HP42s is a high-end RPN calculator in the HP Pioneer line, distinguished by its silicon-on-sapphire Saturn architecture chip code-named "Lewis", and a 131x16 dot matrix display (both were also used on the HP-17B & BII, and HP-27S).
+The HP42s is a high-end RPN calculator in the HP Pioneer line.
+== Hardware ==
+HP42s used a silicon-on-sapphire Saturn architecture chip code-named "Lewis" with 64K of integral ROM and a RAM controller capable of addressing up to 64KB of memory, driving a 131x16 dot matrix display.
+Internally, the HP-42s is extremely similiar to both the HP-17B & BII, and HP-27S, with the exception of the lack of an extended ROM chip which on the 17 series contained international language & error message and on the 27S contained additional instructions. On the HP-42s, this position remains unsoldered. However, the instruction to jump to this memory location is still retained.
+There are three major revisions of HP-42s: A, B and C respectively. Revision A and B have a plastic pane in front of the LCD whereas revision C has a recessed LCD display. Revision C is the most commonly seen variant today.