HP 42S: Difference between revisions

HP 42S (edit)

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 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. 8KB of S-RAM is soldered on board and roughly 7000 Bytes are available to the user as program steps or registers.
-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.
+Internally, the HP-42s is extremely similar 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.
-One notable feature that it shares with HP-17B and 27S is its capability to print to a thermal printer using infrared. The corresponding thermal printer is the HP-82240. It is the only calculator in the Pionner line capable of utilizing the graphics printing capability of the 82240, while other calculators in the line are limited to printing characters.
+One notable feature that it shares with HP-17B and 27S is its capability to print to a thermal printer using infrared. The corresponding thermal printer is the HP-82240. It is the only calculator in the Pioneer line capable of utilizing the graphics printing capability of the 82240, while other calculators in the line are limited to printing characters.
 The HP-42s runs on SysRPL with many low level assembly language tweaks, and thus it supports many advanced features like the HP-28C series. For example, it treats complex values as an object taking up one stack level (instead of consuming two stacks on the HP-41C or having a separate imaginary stack as on the HP-15C). It also supports plotting to LCD with each pixel being individually addressable, and thus capable of drawing or plotting under program command. However unlike the 28C, it supports only 4 stack levels and does not have built-in plotting utilities, requiring the user to program their own.
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 <nowiki>*</nowiki>note: the top row of keys are customarily labeled A-F from left to right.
-HP-42s has two resets: Master reset which puts the calculator back to "factory condition", clearing all memory with On+A+F and Machine reset with On+C which interrupts any program, clears certain flags and set the calculator into a state ready to receive user input again. As with as with 27S and 17B the self test is triggered with On+D. On the first screen of the self test routine hitting backspace (<-) will put the calculator in debugger. In this state the Up/Down keys, divide/multiply keys, plus/minus keys can be used to increment or decrement the current memory address by 1000,100 and 1 nybble(s) respectively.
+HP-42s has two resets: Master reset which puts the calculator back to "factory condition", clearing all memory with On+A+F and Machine reset with On+C which interrupts any program, clears certain flags and set the calculator into a state ready to receive user input again. As with the 27S and 17B, the self test is triggered with On+D. On the first screen of the self test routine hitting backspace (<-) will put the calculator in debugger. In this state the Up/Down keys, divide/multiply keys, plus/minus keys can be used to increment or decrement the current memory address by 1000,100 and 1 nybble(s) respectively.