rs232

IAR embedded workbench
My NEC "78K - Test it!" uses a female 9 pin RS232C connector .

Around 2005, as a project related to a teaching aid, I created a PICAXE project. It comprises three PCBs.
One of these is a voltage convertor using a MAX232. The circuit requires 5V as power supply.

For completion, I have added this article with a legacy tag. Other devices with RS232C connectivity are labelled with the legacy tag.

ar8000 manual
cu8232 manual

The EP44 has an RS232C interface, an LCD display and the intention is to re-purpose it as an interactive device.
BBC micro-bit code
The data connector on the EP44 is a 25 pin female.