Initial Ram Disk

I need to boot from a floppy and then run an installer that requires
an LS-120 containing a big archive to be inserted in place of the boot
floppy. My plan is to copy binaries to a RAM disk and then use
‘prefix’ to change the root, thus allowing the floopy to be removed.

Is there a better way? Is there support for initial RAM disks under
QNX4.25E ?

Thanks in advance

William Morris