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**Wang 400-Series Desktop Programmable Calculators**

Wang's 400-Series calculators were Wang's first machines to make exclusive use of Large Scale Integration technology in the form of RAM (Random Access Memory) and ROM (Read-Only Memory) to help miniaturize a great portion of the functionality of the Wang 600-Series calculators into a reasonably compact true desktop machine. The rest of the logic of the machine also benefitted from improvements in medium-scale bipolar intagrated circuit technology that greatly reduced the number of chips required to produce a microcode-driven general purpose calculator with special purpose ROM code to provide the personality of the calculator. The 400-Series calculators were programmable, with 320 steps of learn-mode programming available in base form. Programs may be loaded from the keyboard, or from optional punched or mark-sense card reader peripherals. All machines in the line provided sixteen memory registers, upon which all four basic math functions could directly or indirectly be peformed. The machines utilize Burroughs Panaplex-style integrated display modules. Wang also offered another line of machines with similar physical design to the 400-series calculators, but lacked the programming features. These machines were internally called the "400L" (perhaps for "Light"), though it appears that this designation never stuck when the machines went into production, and instead, these non-programmable calculators became known and marketed as the Wang "C-Series.

Known Models:

Wang 450 Scientist (Basic Scientific, No Trig)

Wang 452 Advanced Scientist (All features of 450, plus Standard and Hyperbolic Trig)

Wang 462 Stastician (Advanced Statistics)

Wang 487 Surveyor (Surveying)

Wang 452-1 Advanced Scientific Programmable

"-1" Suffix indicates expanded program memory option