SAVFs have some signature stuff at the head - of course, they are in
EBCDIC - but there should be some commonality amongst them - I look
at them in Textpad in hex format sometimes.
I looked at 4 of them and find at position x1085 this string -
QSRDSSPC - and at position 21 I see the model of the machine on which
the SAVF was created, I assume. There's other stuff that seems to be
the same across the 4, other stuff seems to be size overall or number
of rows, whatever.