Calcolatrice da tavolo sanyo 1971 per amatori

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ICC-804D_LABEL.jpg (98251 Byte)Dismantling the featured Sanyo ICC-804D manufactured in September 1971 in Japan reveals a miracle of engineering! Even today, almost 40 years after its introduction, you ask yourself: Why did they combine such an old-fashioned technology like magnetic reed switches and a four-chip calculator brain with the latest LED technology, yielding to an almost unaffordable product with a list price of ¥ 79,500?

ICC-804D_INT.jpg (601903 Byte)ICC-804D_BAT.jpg (88320 Byte)The ICC-804D is not only a heavy calculator, its specific density is much higher than usual. The calculator feels extremely solid and no space inside is left unused. Removing the backside shelf of the calculator housing with its integrated rechargeable NiCd cells attached to it, gives access to a metal frame with multiple printed circuit board (PCB) assemblies:

• The main PCB with the calculator brain
• A smaller display PCB with the LED modules
• A keyboard PCB with the reed switches.
ICC-804D_PCB2.jpg (467553 Byte)The main PCB forms together with the display PCB an extremely compact assembly based on the well-known four integrated circuits with SANYO LM8001, LM8002, LM8003, and LM8005 markings. These chips were manufactured under license of General Instruments Corp., together with Rockwell and Texas Instruments one of the pioneers in the development of LSI circuits (Large-Scale-Integration) in MOS technology.