[273,46]	Tape vivisection programs.

		These will read (fast enough) lots of different
		tape formats. One day I will double-buffer them.
		(22jun85: Maybe I won't double-buffer them. My
		problem is that I want the tape to stop just
		after a bad record. If I double-buffer, the 2nd
		QIO might read the next tape record before I
		inspect the damage; then again it might not.
		Will think it over.)

		I use these for media conversion, typically of
		fixed-field-length records. They work with no
		problems. Improvements are solicited.

		For many of my media conversion programs, I use a
		disk file layout with R.VAR where 1 record of
		disk matches 1 tape record.

		These programs evolved when I paid by wall-clock time
		for use of a PDP-11. So I would set mylar spinning
		then write the other half of a medium conversion
		program while the tape(s) poured onto disk. I.E.
		speed and reliability overrode simplicity.

		I found MAG SET unusable for some tasks and just used
		these trusted kludges.

ASCII.H		Ecch.

B2T.C		Copies a disk file to tape.

CASCII.H	Table to convert EBCDIC to ASCII. (Always a good idea!)

REW.C		Rewind to BeginOfTape.

SPB.C		Space along tape +-n blocks. IO.SPB .

SPF.C		Space along tape +-n file marks. IO.SPF .

T2B.C		The original and best. Wizards only.

T3B.C		A nicer tape reader, with simpler commands.

ANSID.C		Turn T2B output from ANSI "D" format tape into F.CR R.VAR.
