Early Electronic Calculator Miida MC800 Calculator

Manufacturer:  Miida Model:  MC800 Year:  1971 Form:  Desktop Functions:  Basic four Number of Digits:  8 Display Type:  VFI Display: NEC LD8027 Logic Technology:  LSI-3 Diodes:  15 Transistors:  24 IC Complement: OMRON ALPHA 1 OMRON ALPHA 2 OMRON ALPHA 3 Tech. Data Level:  2 Tech. Data Source:  RE Tech. Data Pages:  1 Tech. Data: Schematic (pdf)

Regrettably, years ago I threw out the case and keyboard for my unit of this calculator, due to problems with the keyboard, but kept the electronics. Another calculator enthusiast (J.M.) was able to identify the model number and provided the photo of the complete unit.

Notes:

The keyboard of these calculators is susceptible to problems with the keys binding. See the notes for the MC840.

My unit sans case, but still functioning, connected to a keyboard from some other defunct model.	The logic board with the Nortec/Omron ALPHA LSI chipset. See Rick Bensene's article about the Victor 3900 for some history behind these chips.	Logic board, solder side.
The power supply module, and display module with black shroud removed to show the individual vacuum-flourescent tubes.