Each column represents a single decimal digit, a format known as binary-coded decimal (BCD). The bottom row in each column represents 1 (or 20), with each row above representing higher powers of two, ...

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From there, a series of even more 7490 Binary Coded Decimal counter chips keep track of the ticking seconds, minutes, and hours. While this clock may be from a simpler time, [Greg] doesn’t live ...

What makes it so special? The clock was designed and fabricated because I was inspired and curious the first time I saw one. I wanted to share this excitement with others, and after a year of ...

Technically, it isn’t a BCD (Binary Coded Decimal) watch. The minutes on this watch are displayed in pure binary, e.g., 32, 16, 8, 4, 2, 1, while if BCD, it would be 4, 2, 1 (tens digit), then 8 ...

When developing code to operate a real-time clock (RTC), it is often beneficial to understand how the clock core operating logic has been defined. This tutorial discusses the counter-chain structure ...

MSI and LSI chips as used in clocks, pocket calculators and the like are now being offered at surprisingly low prices. However, if they are intended for driving a display the readout infor- mation is ...

In I-DFP format, floating point numbers can be represented either in binary or binary coded decimal (BCD). A multiplier based on I-DFP, BCD based number system is developed and is functionally ...