NewDos/80

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NewDos/80 is a third-party operating system that was made available for the Radio Shack TRS-80 line of microcomputers beginning in 1980. NewDos/80 was developed by Aparat, Inc. of Denver, Colorado. The operating system had additional commands and features that were not available in TRS-DOS, the native operating system for TRS-80 computers. NewDos/80 allowed TRS-80 computers to take advantage of advances in floppy disk storage that went beyond the initial 85K 35-track, single-density, single-sided format. [1] The system also corrected issues that early versions of TRS-DOS had with arbitrarily losing data due to errors in how it communicated with the contemporary TRS-80 disk drives' 1771 disk controller.

NewDos/80 had many options for specifying specific low-level disk configurations. Settings such as diskette formats, disk drive types, track geometry and controllers could be configured using the PDRIVE command. [2]

Some typical NewDos/80 commands:

NewDos/80 Commands with MS-DOS and UNIX translations
Command	MS-DOS	UNIX/Linux
APPEND	TYPE file1 >> file2	cat file >> file2
ATTRIB	ATTRIB	chmod
AUTO	AUTOEXEC.BAT	~/.profile or ~/.login or /etc/rc*
CLOCK	PROMPT $t *	in some shells: PS1="...\t..." *
COPY	COPY	cp
DIR	DIR	ls
FORMAT	FORMAT	mkfs
FREE	CHKDSK	df
KILL	DEL	rm
LIST	TYPE	cat
LOAD program	PROGRAM	program
PRINT	TYPE file >> PRN	lpr
PROT	ATTRIB	chmod
RENAME	REN or RENAME	mv