![]() At the bottom was a row of labels for the top row of soft keys. It typically showed the current directory at the top, followed by four lines of the stack. The HP-48S/SX had a large 64 × 131 pixel display. The HP-48 also included almost all HP-28C/S features which are not repeated here. Many of the HP-48's functions are described there. To understand the HP-48S/SX, the reader should first visit the RPL page. As the model number suggests, the HP-48SX combined the general expansibility, flexibility and form factor of the HP-41C with the advanced math and programing features of the HP-28C/S and added new features of its own. However, three features of HP's earlier top calculator, the HP-41C, were lost - expansion ports, a completely hand-optimized form factor and a fully reconfigurable keyboard. RPL provided sophisticated features like symbolic math, named variables, structured programming and many other capabilities. ![]() When HP created the HP-28C, it brought the very powerful RPL system to hand held computing.
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