The name is Taylor #4 because that was what was on the label of the disk.
Part of the Trevor Taylor batch of disks.

MON.PRG --
MON.SRC --
    a simple machine language monitor.  the prompt is "*".
    the commands are (ssss=start, eeee=end, nnnn=length):
	A ssss eeee       -- ascii display
	C ssss SSSS nnnn  -- compare two memory ranges (ssss and SSSS for nnnn bytes)
	F ssss eeee nn nn -- search (Find) for byte/word
	G ssss            -- jump (Go) to address ssss
        M ssss SSSS nnnn  -- move block from ssss to SSSS, nnnn bytes
	N                 -- non-destructive memory test
	P ssss            -- poke bytes.  "." to quit.
	S ssss eeee nn    -- search
	T ssss eeee nn .. -- test memory
	X                 -- MOVEB
	Z ssss eeee nn    -- fill ssss to eeee with byte nn

LISTER.PRG --
LISTER.BAS --
    BASIC file lister, by Trevor Taylor

NUMCON.BAS --
    number conversion between bases

PRINT.PRG --
    PRINT V4.0 by Trevor Taylor

DISASS.BAS --
DISPRT.BAS --
    8080 disassemblers

XYPLOT.BAS --
    plot a function over some specified range

RGRESS.BAS --
    least squares fit regression

EDT32.BAS --
    EDITOR/FORMATTER VERSION 32K 10/08/79 JBW
    Meant for editing ASCII files, not .BAS files.