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echo: rberrypi
to: HEADSTONE255@YAHOO.COM
from: STEPHEN EARLY
date: 2019-12-05 11:32:00
subject: Re: RPi I/O expansion?

In article ,
Areligious Republican   wrote:
>Is the memory bus visible at all to allow the addition
>of (unlimited) I/O expansion?

No, but there are many other interfaces available that might be
usable.  For example, you could connect one or more I/O expanders to
the SPI interface or the I2C interface:

https://www.microchip.com/wwwproducts/en/MCP23S17

Stephen Early
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