Steve,

Maybe it's the pedant in me but the disassembled source look's very re-coverable.

It looks to have been written in assembler and is very straight forward. In one day the source quoted above could be recovered and, i believe, understood.

If the new work is to be in assembler the routines would need be included and you would have a firm revision to backup to.

Now if the new work is to be in "C" then recoverability it moot and the routines only provide reference, so that is the proverbial "twist and round-abouts".

regards,
p