[Simh] VAX Tape Emulation?

[Dennis Boone]

 > Many common tape image tools as of two decades use 32-bit integers to
 > carry offsets around and will be limited to 4Gigabyte tape image
 > sizes.

As Mark pointed out, this is block size, not file size.  But it's also
really 31 bits, since in most variants of the format, the high bit means
that the count field indicates either some sort of error or physical end
of medium or similar.

De