Help needed with the Arduino HP-IL mass storage and 41c

[Klaus Overhage]

Hello John,
have you seen my Thread "Arduino IL Drive Sim read good write bad"
https://www.hpmuseum.org/forum/thread-14041.html

Have you replace FILE_WRITE in the file ildrive.cpp with O_RDWR at two places?

If yes, better try too read an existing LIF-file first. Maybe HDRIVE1.DAT from the folder "with Ilper on PC and HP-41CX" in the file "read good write bad.zip" at Post: #1 of my thread. It contains the program MEM, a little game for the HP-41. Copy this HDRIVE1.DAT as the only file to the sd-card an try to read MEM into yout HP-41cx.
Best Regards
Klaus