This calculator was compatible with the HP-41C series but offered a more compact package and utilized a unique menu system which allowed to reduce the number of keys and the number of functions assigned to one key. To answer their concern, HP introduced in 1988 the HP-42s. HP enthusiasts were not happy with the move away from the intuitive RPN to RPL. This model printer is still sold today to connect to HPs current graphing calculators. Shown here (left) is one I found on eBay for not much. The HP-28C had the ability to wirelessly connect to a printer via an infrared transmitter.
This one was fully working with a good battery compartment (a common problem) and in otherwise good condition except for a blemish on the front cover. Since the 28C was very quickly superseded by the HP-28S in 1988 having 4x the memory, the 28C does not fetch a very high price. Shown here (above and right) is a 28C that I found on eBay. On the other hand, its extensive built-in library of math, statistical, conversion and financial functions made it extremely powerful. This and the lack of ability to import or export programs limited the popularity of the model for programming development and sharing. It came with two user's guides, totaling about 675 pages demonstrating the complexity of the calculator. The RPL programming language was not as intuitive as the former RPN.
The display was an LCD matrix which allowed to display either 4 lines of data or a graph. The left side of the case had an alphanumeric keyboard while the right side had the traditional scientific keyboard. The packaging also made a radical departure from the traditional slab style by replacing it with the so-called "clam shell" case. It featured the ability to enter and solve equations symbolically. In 1987, HP took a new direction and introduced the HP-28C, a graphing calculator with a new operating language called RPL. The HP-41C series remained as Hewlett Packard's top calculator for 8 years.
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