[OFFER] IBM PC-DOS 4.0 CSD AND IBM PC-DOS 4.02
PC-DOS 4.00 CSD aka PC-DOS 4.00 Corrective Service Disk Installation
PC-DOS 4.02 is rare version of PC-DOS 4.02 This version of PC-DOS still identified itself as DOS 4.00, even in releases including files with mid-1991 timestamps. PC-DOS 4.02 have a 1990 copyright message. IBM’s ROM DOS 4.0 appears to have used somewhat different technology than Microsoft’s DOS 5.0.