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

The MCP23016 I2C 16 bit expander is about $2 and the SN74LS90D is about $1.65.. SX/28 is $2.79 so it is cheaper. Now I would have to communicate from 1 sx to another.. Is that easy to do?

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