Patches for 2nd Mitsumi CDROM drive works for me with kernels >= 1.1.49

Installation
  - cp mcd2.h /usr/src/linux/include/linux
  - cp mcd2.c /usr/src/linux/drivers/block
  - check the files
    /usr/src/linux/include/linux/mcd.h
    /usr/src/linux/include/linux/mcd2.h
    for support of your hardware. 
  - cp patch1149.diff /usr/src/linux
  - cd /usr/src/linux
  - patch <patch1149.diff
  - mknod -m 666 /dev/mcd2 b 29 0 
  - rebuild the kernel
  - get yourself some coffee
  - reboot

and check it by typing
  - mount -t iso9660 -o ro /dev/mcd2 /mnt

Mail comments and/or bugs to
torsten@imke.hb.north.de
 
