2017-03-18

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Ben Eater

In this video, we'll use an EEPROM (28C16) to create a decimal display for an 8-bit value. The display uses multiplexing to drive four digits using a single EEPROM. As a bonus it supports both unsigned and signed (twos complement) display modes.

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The code used in this video for programming the EEPROM is available here: https://github.com/beneater/eeprom-programmer/blob/master/multiplexed-display/multiplexed-display.ino

See https://eater.net/bbcpu8-output-register for more info.

Parts list for the finished decimal display:

- 1x 28C16 EEPROM

- 1x 555 timer IC

- 1x 74LS76 (Dual JK flip-flop)

- 1x 74LS139 (Dual 2-line to 4-line decoder)

- 4x Common cathode 7-segment displays

- 1x 1k resistor

- 1x 100k resistor

- 2x 10nF capacitors