It worked with a prompt

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MS-DOS.

Last seen on: NY Times Crossword 10 Apr 21, Saturday

Random information on the term “MS-DOS”:

Altos Computer Systems was founded in 1977 by David G. Jackson and Roger William Vass Sr. It focused on small multi-user computers, starting with multi-user derivatives of CP/M, and later including Unix and Xenix-based machines. In its 1982 initial public offering on NASDAQ, the company raised $59M. Thereafter the company’s stock was traded under the symbol ALTO.

Coming under increasing pressure from competitors in the server market, such as Compaq and Sun Microsystems, Altos posted a $5M loss (its first ever) in the fiscal year ending in June, 1989. In the aftermath, Altos was acquired by Acer in 1990 for $94M, although mostly for its US distribution channels rather than its technology. Shortly before this acquisition, there were about 128,000 Altos systems installed throughout the world.

According to a brief history of the company, which ran as an advertisement on their 10th anniversary, Altos Computer Systems was started by Dave Jackson in 1977 when he designed a single-board microcomputer in a room he rented on Stevens Creek Boulevard. According to this account, the company bootstrapped itself with profitable sales from the beginning, with a revenue of $260,000 in the first year. Jackson named the company after Los Altos Hills, California, where he lived.

MS-DOS on Wikipedia