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phogren
March 24th, 2017, 09:11 AM
With the release of the "Raspberry pi zero W" there was much rejoicing in my household.
It now includes built-in WIFI and Bluetooth.

There are numerous boards to add a serial port to the Pi.

HOWEVER to use the serial port there have been some changes (Applies to the PI 3 also),
the serial port is no longer /dev/ttyAMA0 but rather /dev/ttyS0
Also the following line must be added to /boot/config.txt:
enable_uart=1

So far it works great with minicom at 9600 baud , connected to a Kaypro 2X running MDM740. Now onward and
upward.

Chuck(G)
March 24th, 2017, 09:26 AM
What do you use to do the EIA level shifting between the Kaypro and the RP0W? I don't believe that the Pi natively supports EIA voltages.

phogren
March 24th, 2017, 11:46 AM
The adapter on the pi changes the voltages. There are quite a few different ones on the market. At one time there were some that didn't have the chip but
I haven't seen them for awhile.
I think mine is using the MAX3232.