Trying to get an old DOS system to boot to the zlm bootcd.iso. However, the system in question does not have an on board cdrom drive so I'm attempting this from a USB CDROM device which does not work. There is NOT an option for booting to USB from the BIOS.......I've created a DOS boot diskette with usb drivers and can "see" the external USB and the files on it but have no way of running the program (or just don't know how to).

I was able to successfully get the DOS system to PXE boot, but it runs out of memory (128Mb) before it can load the zenworks imaging preboot environment fully. Hence the need (or attempt) to boot to the bootcd.iso (which happens to be on a USB CDROM). Any ideas?