Casio Calculator Emulators - PACK 2: The Best Software for Graphing and Scientific Calculators

The calculator used three "AA"-sized NiCd batteries assembled into a removable proprietary battery pack. Replacement battery packs are no longer available, leaving existing HP-35 calculators to rely on AC power, or their users to rebuild the battery packs themselves using available cells. An external battery charger was available, and the calculator could also run from the charger, with or without batteries installed.

Casio Calculator Emulators - PACK 2

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Follow-on calculators used varying mechanical packaging but most were operationally similar. The HP-25 was a smaller, cheaper model of a programmable scientific calculator without magnetic card reader, with features much like the HP-65. The HP-41C was a major advance in programmability and capacity, and offered CMOS memory so that programs were not lost when the calculator was switched off. It was the first calculator to offer alphanumeric capabilities for both the display and the keyboard. Four external ports below the display area allowed memory expansion (RAM modules), loading of additional programs (ROM modules) and interfacing a wide variety of peripherals including HP-IL ("HP Interface Loop"), a scaled-down version of the HPIB/GPIB/IEEE-488 instrument bus. The later HP-28C and HP-28S added much more memory and a substantially different, more powerful programming metaphor.

Note that AppCAD Classic only runs on "real" DOS. With the exception of the DOS emulator packaged with Windows XP, the other Windows emulators lack the true DOS functionality required by AppCAD and will only run parts of the program.

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