mtcvtv23 converts a tape images in .tpc format to .tap format.

.tpc format tape images have the format

	2 byte record length 1
	record 1
	2 byte record length 2
	record 2
	:
	2 bytes = 0000 for end of file

and so on.  This is the format produced by various UNIX utilities
for dumping tape images.

.tap format tape images have the format

	4 byte record length 1
	record 1
	repeat of 4 byte record length 1
	4 byte record length 2
	record 2
	repeat of 4 byte record length 2
	:
	4 bytes = 00000000 for end of file

and so on.  This is the tape format expected by simh, Tim Stark's TS10,
and John Wilson's E11.

mtcvtv23 is invoked by

	mtcvtv23 file1 file2 file3...

Each file in turn is converted from .tpc format to .tap format.  The
input file can have any extension; the converted file will have a .tap
extension.