First, I ran ubcd v4.11 (same computer, same drive) from cd and dvd, and everything seemed to work fine.
Second, if I run v5.01 from usb flash drive, everything seems to work.
But if I run v5.01 from cd or dvd, everything except any FreeDOS stuff works. The FreeDOS menu eventually shows up but clicking 'Launch' does not list the available apps. Meanwhile it complains the CD-ROM drive is missing.
The 'drd' command shows no active drives (all invalid) except:
A: writable (memdisk fake writable)
I searched the forum and found this:
I downloaded ubcd50RC1_dos.iso and put it in custom.
I edited custom.cfg to add:
MENU LABEL Boot DOS apps of UBCD50RC1
APPEND iso raw
I edited custom.lst to add:
title Boot DOS apps of UBCD50RC1
map /boot/ubcd/ubcd50RC1_dos.iso (hd33) || map --mem /boot/ubcd/ubcd50RC1_dos.iso (hd33)
map --mem (hd33)/ubcd/images/fdubcd.img.gz (fd0)
No luck, but I think I got an error message when I tried grub4dos, which complained about not finding /boot/ubcd/ubcd50RC1_dos.iso, so I copied it there too. No error message, but still didn't find my dvd drive. I imagine these v5.0RC instructions might not apply to v5.01 though.
Any suggestions? Thanks.