![]() The ↱ caused the seconds to be divided instead of multiplied. Then the user would attach the seconds by pressing UNITS TIME ↱ s leaving 40_ft/s on the stack. For example, to add 40 feet/sec to 20 MPH, the user could press: 40 UNITS LENGTH FT which would leave 40_ft on the stack. On the HP-48SX, units could be attached to numbers and problems could be solved in a natural way. The user could also edit elements without moving them or trim the top of the stack. The Interactive Stack allowed the user to easily move elements around, copy elements in the stack or into the command line, delete groups of elements and to combine groups of elements into lists. After pressing the ▲ key, the user could scroll through the stack. The new Interactive Stack feature gave the user an easy way to rearrange entries on the stack. To edit an array on the stack, the user pressed the ▼ key which entered the Matrix Writer with the array from stack level 1 loaded. A second press of Enter saved the matrix on the stack. To enter data, the user moved to each cell, typed the data and then pressed Enter. Other capabilities included inserting and deleting rows and columns, reading and writing elements from the stack etc. The column widths could be changed with the WID soft keys. The screen looked much like a spreadsheet with a window of 5 rows by 4 columns which scrolled in both directions as needed. The Matrix Writer application provided a convenient way to create and manipulate arrays. The equation writer application finally allowed expressions to be entered and viewed just like they would be written on paper. Early models were only vaguely "algebraic" but by the 90s most "algebraic" calculators could at least honestly claim that users could enter an expression in the way it would be typed into a compiler. Though makers of algebraic calculators had claimed for nearly 20 years that their calculators allowed entry of expressions just as the were written on paper, this was never quite true. A plot with plot-related soft key labels is shown. The large screen made plotting as well as features like the Equation Writer and the Matrix Writer more useful. 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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