[idrougge]

I've used a little ARexx script for joining:

/* REXX */
parse arg oddfile evenfile joinedfile .
if joinedfile='' then joinedfile=’joined.rom'

if ~open(odd,oddfile,READ) then exit 10
if ~open(even,evenfile,READ) then exit 10
if ~open(joined,joinedfile,WRITE) then exit 10

do while ~eof(odd)
	low=readch(odd,2)
	high=readch(even,2)
	call writech joined,low || high
end
say seek(odd,0) 'bytes read'
say seek(joined,0) 'bytes written'