In SX Microcontrollers, SX/B Compiler and SX-Key Tool, roycarlson wrote:

I found this website that has something similar to what I built but my board seems to use the 74HC245 to shift or control the hi/low signals to the transistors before they reach the rows and columns.

Here is the website: http://www.best-microcontroller-projects.com/led-dot-matrix-display.html

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