Booting Up the June, 1981 Pre-Release Copy
of IBM® Personal Computer™ DOS 1.00

All Photos Copyright©2019 by Daniel B. Sedory
NOT to be reproduced in any form without Permission of the Author !

 

The IBM DOS “June, 1981” Boot Screens:

NOTE: Some pictures are CLICKable to see larger size!

 

 

After the disk boots, it executes an AUTOEXEC.BAT file which runs DATE.COM, then MOVBAS.COM and BAS18A.COM.

Note that the range of dates for early IBM PC DOS; apart from the strange "00-00-80" you see here on the second line, were only from 01-01-80 through 12-31-99. Entering anything else would result in an "INVALID" error message.

 

 

After exiting the BASIC program using SYSTEM, a DIR *.COM command was entered:

Note that the latest file date here is 06-04-81 (June 4, 1981); two months before the final release was ready. At that time, all of the release files had their dates changed to "08-04-81"; no matter what the last modified date had been).

 

 

Note: The 3.5-inch Floppy Disk Drive that was used is capable of reading the latest (for its time) 1440 KB (double-sided, normal high density, 18 Sectors/Track, 80 Tracks) diskette. Yet it is still capable of reading a floppy formatted as only a single-sided, 8 SPT, 40-Track, 160 KB diskette!

For more about the hardware that was used, see our page: .

 

 

First Published: 22 JUL 2019 (22.07.2019).

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