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UBCD50b12 with grub4dos support is doing well and all SubMenus can be reached.
Booting the ISO loaded from HD into memory using GRUB4DOS can be realised
by using
BOOT_ISO.exe of U_XP_SET package to make the HD Boot Option in GRUB4DOS menu.lst
It works very fast and allows to Boot from your NTFS Harddisk in this way
with all kind of floppy images present in the UBCD50b12 ISO loaded into RAM memory.
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So DOS is still alive and UBCD50b12 makes everything very handy and useful.
You can Boot with UBCD50b12 ISO Not only from your NTFS Harddisk,
but also from your Bootable USB-stick made with
Make_USB.exe ,
where in this case you have to manually adjust the preconfigured
menu.lst file.
menu.lstCODE
title Boot ubcd50b12.iso - ISO from RAM
find --set-root --ignore-floppies /ubcd50b12.iso
map --mem /ubcd50b12.iso (hd32)
map --hook
root (hd32)
chainloader (hd32)
Some options e.g. UBCD FreeDos require to use the GRUB4DOS Menu since otherwise Invalid Opcode is the result.
Therefore it is better to boot directly with the GRUB4DOS Menu
by using configfile option in GRUB4DOS menu.lst
Best results are obtained with
menu.lstCODE
title Boot ubcd50b12.iso - GRUB4DOS Menu
find --set-root /ubcd50b12.iso
map --mem /ubcd50b12.iso (hd32)
map --hook
root (hd32)
configfile /ubcd/menus/grub4dos/main.lst