Reader/writer for Psion II datapacks
See https://hackaday.io/project/168408-psion-ii-remote-control
Connect serial port at 115200 baud
Needs delays when programming. I use minicom with the following settings

+---------------[Terminal settings]----------------+
|                                                  |
| A -      Terminal emulation : VT102              |
| B -     Backspace key sends : BS                 |
| C -          Status line is : disabled           |
| D -   Newline tx delay (ms) : 999                |
| E -          ENQ answerback : Minicom2.7.1       |
| F - Character tx delay (ms) : 50                 |
|    Change which setting?                         |
|                                                  |
+--------------------------------------------------+


Then use the paste option (CTRL-A Y) to paste the S-Record file into the terminal window.